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Noisy baits, Part 1 popping corks and rattles: by Dr. Bogus with Brian Cope

 

I’m (Dr. Bogus) a scientist so I always like to look at things from the scientific viewpoint, so when I saw the article by South Carolina fishing and outdoors writer Brian Cope on noise and designing noisy baits I thought that was a really interesting article. One of the things about that is we know that fish hear, how DO fish hear and how do we use that to create useful baits?

According to Cope, fish can hear in two ways, first high frequency sounds through their ear stones called otoliths inside their heads and secondly they “hear” low frequency vibrations through their lateral line, which you can clearly see in most fish, it’s just a line running down the center of their body lengthwise along each of their sides.

So what do they hear?

“You know sounds like fish pumping, fish opening their gills, inflating their bladders and deflating their bladders,” explained Cope, “lot of noises we can’t hear, but that fish do hear.”

There is something we need to know about sound in the air and water…the scientist in me of course.  If we have a thunder storm and, we’ve had some lately, if you see a lightning strike somewhere, the thunder and other noises travel about five seconds/mile in the air. On the other hand in water, sound travels really fast, about one-second/mile. Some of the early baits, some of the early things we were trying to make noise with are corks. And also, I know when I fished as a kid, popping plugs, those were some of the first ones. Brian, where did you start trying to use baits that make noise and mimic fishy sounds?

“Popping corks were the first that I remember ever intentionally making noise,” said Cope, “ to try and attract fish and that really was the only thing that I ever used or saw anyone else use for saltwater anyway for a very long time until Rat-L-Traps came along certainly for bass in freshwater. Interestingly they are not really popular in the saltwater world even though they do now make Rat-L-Traps that are for saltwater use, that have the corrosion resistant hooks.”

It’s interesting, you brought up the Rat-L-Traps Brian, here’s one right now (rattle sounds), and that was one of the first…Bill Lewis came up with Rat-L-Traps for freshwater  bass fishing back in the 1960s. And you were absolutely right, it took people a long time to put hooks that didn’t dissolve after one use in saltwater, because they really are an excellent bait. As far as noisy baits, this was probably the first one, and is still great.

So Brian, what is the difference between a noise that attracts fish and a noise that scatters them?

“As we all learned when we were kids,” said Cope, “you don’t want to make a lot of noise in the boat, your feet banging on the boat, or the paddle hitting the side of the boat, things like that are going to alarm the fish and send them scattering, but they are going to be attracted noises that sound more natural to them, like bait fish normally make.”

These days there are many baits with rattle noise makers, what are some good examples Brian?

“MirrOlures and YoZuris and even some of the Super Spooks have noise makers in them, those are definitely good ones that are really similar in what the Rat-L-Trap does,” explained Cope.”

“There are also soft baits now that can make noise with small rattles, said Cope,. “like the Vudu rattling shrimp.  You know the Vudu shrimp has been around for a few years now; it’s a really effective bait. They make one know that has a little chamber in it that you can slip a rattle or weight into, and those are similar to what the bass world started using years ago that bass anglers would just cut a slit in the soft plastic and insert a little rattle. But they fell out and it was hard to do with slippery hands, but now the Vudu shrimp just has an actual chamber that the rattle that comes with it slides into.”

 For those who are not familiar, shrimp are noisy critters, snapping and popping as they move through the water feeding or escaping the jaws of a predator looking for a snack.

“You can definitely hear the shrimp making noise” said Cope, “if you are around at the right time and I’m sure it sounds different to the fish but they certainly do make noise especially when they “pop” their tails to move.”

 

Noisy baits, Part 2 Surface baits, spinners and the new electronic baits: by Dr. Bogus with Brian Cope

 

Brian, I use a lot of top-water baits and I assume you do too, some of those baits emit different frequencies.  Have you found that either the high pitch or low pitch clickers are more effective?

“Well, yes certainly are on different days,” explained Cope. “I‘ve never found one that absolutely works under certain conditions, but I’ve found that if you have a variety of them on board with you, you can usually find one that works from one day to the next, and if I had the scientific background I maybe would be able to tell you why that is, but I do know that is certainly makes a difference from one day to the next. The obvious thing is to try the different ones until you get success.”

We talked about the Rat-L-Trap which didn’t get used in saltwater until more recently, but another bait that was really popular in freshwater was the spinner baits, the bass buzz baits and we are finally getting to realize that they are effective saltwater too. They also make a lot of noise and vibrations.

“Yes,” smirked Cope,  “and you know they’re still, at least in the circles that I run in not used as often as I think they should be.” “A lot of them are people that bass fish and they go to the beach a couple of times a year and they don’t want to buy a bunch of new tackle so they just take their bass gear with them. But certainly spinner baits and buzz baits early in the morning can be extremely effective on redfish and trout and just as effective as they are with bass.”

Like with any of the other baits there is a lot of variation, long skinny leafy blades, big round ones, they all work at a different level at the fish.  Do you have any preferences Brian?

“Well the Redfish Magic is a saltwater spinner bait which is a little different than most freshwater spinner baits,” said Cope “mainly because of it being made for saltwater and having the corrosion resistance, that’s my favorite.”

Anything new and exciting out there, high tech maybe, Brian?

“One of the most unique ones I think out there is made by Livingston Lures,” said Cope. “These lures have electronic circuit boards in them that make noise and unlike just plain rattling noises they have recordings of actual bait fish sounds that are turned on when the lure gets wet.”

Wow, have you used those baits and have you found them to be effective, Brian?

“Yes I have used those baits,” said Cope excitingly. “I really love those baits and in some circumstances they can really make your day when nothing else is biting and like any other bait I’ve ever used I’ve also had days when I really didn’t have a lot of luck with them.” “It’s just another case of having a variety of lures on board with you and going through then to find something that works.”

Do you think those Livingston baits as they become more popular; the price will come down on them?

“Hopefully so groaned,” Cope. “I think they are $15-$20 right now. Those baits actually have adjustable sounds in them. You can shut them off or select from several different sounds.”

Have you find a sound that works best for you or do you just try them all?

“Yes,” said Cope, “so I just try them all, that’s the way I’ve done it and I’ve never found that a specific one that works any better than the other except on some days one will work better than the others.”

Thanks Brian, hopefully we now have a better feeling on noisy baits. Good noise, bad noise, now smart chips, so let’s go catch some fish!

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For the best results, try live ‘n’ kickin’ bait, By Dr. Bogus (from 2006)

 

If you like to fish, almost any bait will do, if you really want to catch fish, most people go with live bait. Here is what you need to know about catching and using the real thing for bait.

Although I mostly stick to metal, plastic and sometimes wood as baits, even I must admit that live baits, more often than not, will out fish metal, plastic and wooden artificial baits. However, the key questions to live baits are where and how. As an answer to where and how, Capt. Jeff Cronk (Fishin’ 4 Life Charters, Swansboro), often jokes, “the easiest way to get bait is find a marina that sells them!”

But for many of us, hunting and gathering our own bait is just part of the lure, the process, yes the ritual of fishing. For the inshore and nearshore angler, the list of natural baits is seemingly endless, but the main targets include crunchy baits such as fiddler crabs, and shrimp and small finfish like finger mullet, killifish, and menhaden or pogies as they are often referred to.

Fiddler crabs are favorites foods of the munchers and crunchers, specifically sheepshead and black drum are the prime targets for these baits. “I use a lot of fiddler crabs,” said Cronk, but he warns, “they’re easy to find, easy to see, and hard to get.  You’ll find fiddler crabs anywhere there is shoreline. At low tide they tend to come away from the marsh grass to avoid the heat. They leave their little holes and come down to the water’s edge in large colonies from dozens to hundreds to thousands. You can pick them up along the shoreline like that, on the lower part of the tide, especially if there is a good amount of sun out.”

What do you mean, pick them up? With your hands?

“Well,” smiled Cronk, “you’ve got to feel comfortable with that big claw, those one-arm bandits they are called with that big claw, and I’ve seen some claws as big as two and one-half inches long.” But actually,  I don’t usually pick them up by hand if I don’t have to,” explained Cronk, “I’ll take a regular dip-net that you use in your live-well…one that has a flat surface so I can lay it down flat on the ground, and I like to hop on the shoreline about 30-yards down from where the crab colony is and kind of surprise attack them over the marsh.”

You herd them in?

“That’s it, I herd them to the water’s edge back and forth, said Cronk, “you know there are thousands going by me or hundreds going by me, so if I can corner 50 to a 100 along the water’s edge, I can sweep them up with that little net and I’ve got plenty. If not, you’ve got to pick them up one-by-one, which can be time consuming!”

As far as rigging a fiddler, it’s pretty straight forward, explains Cronk; “you can hook them just about anywhere. They are not very big so there isn’t a corner or this or that side that is best, so I come up the back side of the fiddler crab from the bottom to the top, staying close to one side of the crab. It doesn’t necessarily have to be alive, as long as he’s fresh. I’m using a live bait hook, a short shank, wide gap hook, usually a strong stout hook, because I’ve had this year again I’ve had big sheepshead snap a hook in two or bite a hook in two!” “As far as black drum, said Cronk, “I use the same type of hook a live bait hook usually on a slip cork rig around a shallow oyster bed and letting it float just above the depth of the bottom.”

How shallow?

“Most of the places I’m catching my black drum are between one and three-foot of water, said Cronk, and I tend to fish them on the falling tide when the black drum would have to come off the oyster rocks and hang in the eddies just off the rocks.”

Now shrimp, there is nothing in the water that won’t eat shrimp.

“Right, agrees Cronk, “he is THE best bait, I have caught every inshore species and believe it or not, I’ve caught a king mackerel on live shrimp. But then again it’s the toughest to fish with because something will bite on your hook within seconds to a minute or so from when it hits the water. And if you are trying to target certain species it can be irritating.”

Rigging is a little more complicated than some other baits, especially if you want to keep your shrimp alive, so we asked Greg Dennis, owner of The Reel Outdoors Tackle shop in Emerald Isle, for some help. “There are three ways that I know of,” said Dennis, “the first is to place the hook into the base of the horn, which is that sharp point that comes out of the shrimp’s head. Below the horn is a dark spot in the shrimp’s head, that’s the brain, if you hook him there you will kill them, so you hook it in the clear area below the dark spot. Finally some hook the shrimp in the tail, not in the end of the tail but a ¼ or ½ inch above the tail.”

As Cronk pointed out, shrimp will catch anything, but the prime targets are speckled trout, black drum, sheepshead and red drum too. “I’ve have seen times when they (red drum) won’t eat a mullet minnow,” said Cronk, “but they’ll take a live shrimp, which is very odd to me.”

Floating them on a cork at the Cape Lookout rock jetty for specks or on a Carolina rig are the standard methods of fishing shrimp. Carolina rigs can come in several flavors, a true Carolina rig, where your egg sinker is placed on your main line, above your leader material, or a modified Carolina rig as Cronk uses, in which your egg (or slip sinker) weight is placed on your leader material between your swivel and hook. Leader material is typically 15 to 40-pound fluorocarbon and the hooks are usually gold Kahle (wide gap) hooks from No. 2 to a 3/0 in size.

We’ve talked the crunchy baits, now for the live minnow baits. What are the favorites? “The tiger-side (striped killifish) minnows are actually my favorite,” explained Cronk, “when you start off in the season when you can’t get those finger mullets in April and early May when trying to catch flounder, you can catch those tiger-side minnows along the (ocean) beach and so I start off every season with the tiger-side minnows and slowly move into the finger mullets threadfin herring.”

Like many baits, live minnows are caught with a cast net. “I actually stand on the sand ankle deep in the water, said Cronk, and five or ten feet in front of me and you’ll see these little wakes leaving the sand. You’ve got to hit then right then with the net, because they will leave before you can get on of top them. So you cast up ahead of yourself.”

Another member of the killifish family is the common killifish or mud minnow. “Yes, mud minnows are another good bait,” said Dennis, “I trap them in minnow traps, using canned dog food or cat food for bait. You can find the mud minnows up in the creeks and ditches and around docks too.” 

“Although most baits like shrimp and mullet require a live well or aerator,” explained Dennis, “mud minnows (and tiger-minnows too) are very hearty, and can sit in a bucket all day and still be fine.”

Although Cronk’s favorite bait may be the tiger-minnow, Dennis prefers finger mullet. “They are the all around bait for just about everything,” said Dennis, “drum, trout and flounder, and the pinfish don’t peck at it like they do shrimp either.”

 The Tiger-minnows are an early season bait, the finger mullet come later. “Usually by the first of May we start seeing the mullet minnows,” said Cronk, “they are still small then, within two weeks from when we see them they are an inch or two long, within several weeks after that they are good size, and they were late this year. They grew slowly but now they are everywhere.”

So where can you catch them? “You can find them along the shoreline and the canals and creeks,” said Dennis, “and the best time is on the falling tide. When the tide is high the mullet and other bait (like shrimp) are up in the marsh grass and hard to get.”

Rigging is straightforward according to Cronk. “I’m lip hooking them,” said Cronk, “on my Carolina rigs or my modified Carolina rigs I’m casting out and doing a slow retrieve, so I’m dragging the minnow, and I’m putting in under it’s chin and through the top of it’s lips and I’m trying to not pierce it’s brain and stay away from it’s eyes. If I work them on a float cork, I’ll hook them at the anal fin on the underside of the body or on top, on the dorsal fin.”

“I don’t do that with menhaden a lot,” said Cronk, “because the menhaden will circle around and tangle your rig up. Menhaden are strictly nose hooked through the nostrils sideways. If you close his mouth, he will die within seconds if he can’t breathe.” So what about menhaden? Well, according to Cronk, “menhaden are the most abundant and easiest fish for most folks to catch. The menhaden we’re targeting, I use them when it’s hard to get the mullet minnows, and we are targeting flounder. Quite often I use the peanut pogies, and they may be two to four or five inches long and I use them on the Carolina rig. When they start getting about five-inches long or so, and all the way up to nine to 12-inches long, we’ll be targeting Spanish and king mackerel usually using a live bait rig with a treble hook.”

We mentioned using a cast net for catching shrimp, and our finfish baits, but what are the best sizes for these inshore baits? “The best all around cast nets,” said Dennis, “are 5 or 6-feet in radius (10 to 12-feet in diameter) with a mesh size of 3/8-inch. If you are trying to catch the smaller glass minnows you need a net with a ¼-inch mesh size or they will just go through the net.”

Now throwing a cast net is an art in itself, and is as individualized as each thrower. But that’s another article.

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Surf at Bogue Pier ranged from Low of 68-degrees to a high of 76-degrees with an average of 72.0-degrees (blue diamonds). Bogue Sound had a low of 64-degrees a high of 82-degrees with an average of 73.9-degrees (red squares).  May temps fluctuated a bit but increased steadily increased about 0.18-degrees/day and we continue to be above normal compared with my 20+ years of data. We got into the mid 70s by the middle of May, more like mid-June temps. This year the water temps continue to be above normal. Watch out for an active hurricane season.

 

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Surf at Bogue Pier ranged from Low of 57-degrees to a unbelievable high of 68-degrees with an average of 63.4-degrees (blue diamonds), an average of 8-degrees higher than March. Bogue Sound had a low of 57-degrees a high of 76-degrees with an average of 67.5-degrees (red squares) 12.6-degrees higher than March.  April temps steadily increased about 0.33-degrees/day. And we were above normal compared with my 20+ years of data. We normally don’t get to 68-degrees in the surf until two weeks into May. All this has brought in fish a couple weeks early and we have also had a banner month of Hatteras blues, at numbers we haven’t seen in 5-years.

 

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Surf at Bogue Pier ranged from Low of 50-degrees to a unbelievable high of 62-degrees with an average of 55.4-degrees (blue diamonds). Bogue Sound had a low of 41-degrees a high of 65-degrees with an average of 54.9-degrees (red squares).  March temps we truly rollercoasterish (see plot) with huge variations and the monthly averages for surf and sound only very ever so slightly above February’s averages. Strangely a straight line drawn through the the data was basically a horizontal flat line slope of nearly zero. Crazy month.

 

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Surf at Bogue Pier ranged from Low of 48-degrees to a unbelievable high of 66-degrees with an average of 54.7-degrees (blue diamonds). Bogue Sound had a low of 44-degrees a high of 65-degrees with an average of 54.1-degrees (red squares).  Temperatures in late February were way above normal, being more like late April or early May. Average surf for February is about 50-degrees. I’ve never seen 60s in February, and my data goes back to 1995. Remember 2015 when we had high spring temps (not this high) we had year of the shark attacks. North going sharks and south going bathers collided…ouch!

This is a plot of water temps by week, with an average curve drawn through the data. Notice the black square with the “X”, that was the temperature for Saturday February 25, 2017. Just a tad above normal!

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Jason Peters NC Artificial Reef  program coordinator, The NC Artificial Reef Program and the New AR Guide from an interview I did on the radio on 9/26/16

Today I’m talking to Jason Peters, Coordinator of North Carolina’s Artificial Reef Program.  Welcome Jason can you give us a brief history of NCs AR program, then we will talk about the new AR Reef Guide.

“So, I guess back in the 1940s and 1950s there was a lot of interest in fishing hard bottom but one of the major issues was the hard bottom habitat was so far offshore,” explained Peters,  “so grass roots effort began to put material a little bit closer to shore.” “It was fairly disorganized and there was no real standard of what types of materials to use.” “There were bath tubs, washing machines and things like that,” chuckled Peters, “and so and they worked for a couple of years they would rust away and be gone.”

“Then in the mid-1980s” said Peters, “the state took over from the individual permits that existed out there and set a standard on how we would build artificial reefs.” “One of the things that we do preserve is the idea that we want to improve access so we try to build reefs that people can get to that they can fish. Since the 1980s we’ve been chugging along we’ve been building lots of reefs we’ve got 62 now including the estuarine reefs and we try to enhance anywhere from two to four a year by sinking ships of putting concrete pipe and things like that.”

One of the reefs that has been enhanced recently was AR-330 when you sank the a ship renamed the James J. Francesconi in honor of Jim* the former coordinator of the AR Program.  So how did that sinking go Jason?

 

“Well it’s always stressful,” sighed Peters, “when you sink a ship; there are so many things that can go wrong.” “Even a potential for people to get hurt, but everything went off without a hitch, very-very well, sank right to the bottom, didn’t roll or anything. We actually sank two vessels, they are both upright right in line as we planned, clearance is about 17-feet so we meet all out permitting requirements and from what we hear there are tons of fish on them and the visibility is great.”

 

 

Now to the NEW Artificial Reef Guide. If you go to NCDMF website or stop in their offices in Morehead City, they have available their new AR Guide. I’m holding in my hands the original AR guide, done by Stephen Murphey back in 1995! It has nice hand drawn pictures of boats and rubble and concrete pipes and LORAN numbers which have to be translated into some other language for us to understand them right now. So Jason, the new reef guide which was paid for by our Coastal Recreational Fishing License (CRFL) fees by the way, can you give us an idea of what it looks like, how it’s organized, then we can get into the interactive reef guide on the NCDMF web site.

“I’ll start off by saying we’re really proud of this,” exclaimed Peters, “it’s been over 20-years since the last publication and there are a lot of people that put in a lot of time into this particularly Amy Comer-Flowers, and Rachel Love-Adrick, that really created this and edited it.” “What you will get when you pick this book up is…so it’s a spiral bound book and it’s got water-proof pages. Essentially we have every single artificial reef in North Carolina, so all 62 reefs. It’s broken down into sections by bays in the ocean. All the reefs in the Outer Banks is in one section, Raleigh Bay which is from Cape Hatteras to Cape Lookout, Onslow Bay, Long Bay and then our estuarine reefs.”

“And if you go to any particular reef,” said Peters, “you get a table and you get a map.” “So the map is outlined reef patches that are based off of side-scan sonar imagery that was collected in the last 5- or 6-years, and an identifier. And that identifier number will link you back to the table where you can read about the material type, when it was deployed, and get GPS coordinates for each one of those patches. On top of that for each reef, you get provided the magnetic direction and distance from nearby inlets. 

I noticed in the guide book that you can write in your own notes.

“Absolutely,” said Peters, “we got a little note section so that as your fishing it as you decide which patches you like best or what you’re catching or different conditions you can write down your notes and go back and hopefully recreate the scenario the next time you fish.”

Now on these reefs you have “patches” of stuff, how were those generated where you have clusters of the pipes or the ships or whatever?

Sure, so as I mentioned, each reef was side scanned or has been side scanned in the last 5- or 6- years,” said Peters, and “CRFL funds actually funded a staff member to outline each one of the patches in GIS (Geographic Information Systems) or a geographic mapping program, and that’s how we got those. What you see is actually what’s on the bottom.”

I noticed that it was really up-to-date since you even have the boats you recently sank this spring there at AR-330. You ran out there and touched up, did the final touchups before this got printed.

“Yes,” smiled Peters, “we wanted it to be the most up-to-date, the most accurate version that we could provide.”  “I think the plan is every few years, maybe 5- or 6-years we’ll try to come up with and update.”

Not 20-years!

“No not 20-years,” said Peters, “we’ll try to be a little quicker than that.”

Another really big advantage, if you go to the Marine Fisheries web site portal is that the new guide has a user friendly interactive web site, with simple to follow short tutorials. Can you explain how that is set up and how the sonar side-scan data is represented?

“We’re trying to keep up with the times,” explained Peters, “so we’ve gone digital with our reef guide.” “There’s an on-line version, an interactive version that you can find on our web site (http://portal.ncdenr.org/web/mf/artificial-reefs-program). Essentially you get all the information that you can get in the printed guide and then in addition to that there are some mapping tools that help you determine distances for example, and distances between patches. You can also create personalized maps of certain areas on reefs that you can print out.”

I noticed that you can create like a polygon or something around a particular area, mark that or print it out or preserve it.

“That’s exactly right,” said Peters, “ if there’s a certain portion of a reef you really like or you want to zoom in on you can zoom in on that and print it right out.”

It’s like a Google Maps, like going in and looking at neighborhoods.

“That’s a good description,” agreed Peters, “that’s actually the description that I use to explain it to people, it’s a lot like Google Maps where you can zoom in.”

I also noticed that when I was running a cursor over something you get the GPS locations of any one of those spots.

“That’s correct,” said Peters, “if you find a patch you like you can click on it and there will be a little pop-up window that will give you GPS information, material information and actually in some cases with the vessels there are links to the history of the vessel that was sunk there so it you are a history buff you can get a little background information on that vessel. Also with the zooming tool, you can see individual pipes and reef balls and things like that, it’s real neat.”

So Jason, what are the plans of the artificial reef program, what can we look forward in the future?

 “We’re very-very active”, spirited Peters, “we have a lot going on. “Particularly this year we’re planning on sinking two vessels at AR-320, that’s the Novelty ship site off Atlantic Beach, so hopefully if all goes well we’ll get that done sometime this late fall or winter or early part of 2017 depending on how the cleaning process goes with the vessels.” “We’re also looking at two brand new artificial reefs that will be estuarine artificial reefs in Carteret County in Bogue Sound. One potentially in Cedar Point and one in Atlantic Beach, so we’re in the very early stages of planning that out. We’ve got an enhancement project down at AR-430 down off Oak Island, that will be about 4,000 tons of concrete pipe and we’ve also got some work proposed at AR-372, that’s down off Wrightsville Beach, that’s again a concrete pipe project.”

Concrete, that’s a great reef material.

“It really is,” exclaimed Peters, “it provides great habitat, lots of nooks and crannies. And we’re also looking into a brand new artificial reef site in the ocean off the Outer Banks.”

Would that be from the Bonner Bridge material?

“Actually no,” corrected Peters, “ this would be completely new and pending a CRFL application that’s in right now and depending on whether or not that gets funded there might be a new reef up there.”

So what will be the status of the Bonner Bridge remains as they tear down the old bridge for the new span?

“For the Bonner Bridge material,” said Peters, “we’re looking at some time in 2018.” “Once the new bridge is constructed they will demolish the old one and we’ll and we’ll take that material and distribute among the four reefs on the Outer Banks.”

That will make a lot of material!

“Yes,” exclaimed Peters, “80,000 tons!”

“That beats tires,” I said!

“Don’t even speak those words around here,” shouted Peters.

Sorry Jason!

——————————————–

*Jim Francesconi who was the former coordinator of the AR Program for 14-years (2000-2014), passed away from a long bout with leukemia In July 2014. Jim was the heart and soul of the program during that time, and particularly loved AR 330.  The ship was renamed the James J. Francesconi and sunk in his honor. A plate acknowledging that is permanently affixed to the ship.

 

 

 

 

 

 

 

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Surf at Bogue Pier ranged from high of 56-degrees to a low of 44-degrees with an average of 51.9-degrees (blue diamonds). Bogue Sound had a high of 57-degrees but a low of 32-degrees with an average of 49.8-degrees (red squares).  Temperatures in January were near or slightly above normal except for the dive they took January 7-10, 2017 and resulted in minor trout kills most notably in the North River. Slope was nearly flat showing a very slight but not significant rise.

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NCDMF Carcass Collection Program by Dr. Bogus

So I went out fishing the other day, tried top-water bait for a red drum and landed a feisty slot 23-inch red, however I struck out using live finger mullet for flounder only catching a few undersized 12- or 13-inch throwbacks, and all the time I was thinking It would be nice if we had a good run of speckled trout along the surf this fall. We have all had successes and failures and we have all dodged the minefield that is the moving target of fisheries regulations. By the way, there’s an APP for that!

Effective fisheries management requires real fish-data to assess the viability of important commercial and recreational species.  Stock assessments to attain breed stock, mortality, age and population distributions act as data to be inputted into complex models to assess the health or not of various important commercial and recreational species as flounder, gray and speckled trout, red and black drum to name just a few. Data to be used come from many sources such as fish tagging studies, fishermen onsite fishing pier, marina, boat ramp and phone surveys, commercial trip tickets and now more recently the North Carolina Division of Marine Fisheries (NCDMF) has instituted a recreational carcass collection program. Yes, you now have something to do with your dead fish carcasses that don’t involve crab bait!

I recently talked with Randy Gregory on my radio show (WTKF 107.1 FM 1240 AM, every Monday morning at 7:30 AM) about this relatively new program. Randy is a fisheries biologist who has worked in NCDMF for over 27-years and currently runs their age and growth laboratory. You may have even seen him at various fishing tournaments around the state including the Governor’s Cup Billfish Conservation Series which includes the world renowned Big Rock Blue Marlin Tournament.

As Gregory points out, “We can’t go out and have a census for fish. We can’t go and ask how old they are how many fry they have in their house and those kinds of things, so what we do is build an idea of what the age structure of the population looks like and then through our catch and through our landings we try to figure out the numbers of each of those fish in those age groups.”

How does the carcass collection program do this? “First we’ve gone out and placed freezers at marinas and other places where recreational fishermen will congregate, tackle shops, things like that.” said Gregory,  so in the local area, here around Morehead, we have a place at Harker’s Island, we have Freeman’s Tackle over in Atlantic Beach, Dudley’s Marina down in Swansboro. So those are our collection centers and what we want people to do is bring us their recreational catch after they fillet it.”

After they filleted  their dinner out?  “Yes,” said Gregory, “we just need the rack, we just need the carcass! But we need the head but we need the whole length, so we need to figure out how long it is, what the sex of the fish is. We don’t need a whole lot of information for that so anybody that normally fillets their fish we can usually figure out most of them.”

So I’m a fisherman, I cleaned my fish, what do I do then? “We want you to fill out a catch card,” explained Gregory, “it gives us a little information about you and about where you caught your fish which is always something that we need. And we have freezer bags and you can put your filleted catch in the bag and you tie it up with a little red tie and throw it in the freezer and we come around when maybe somebody call us and says they have some stuff in the freezer.”

How about feedback? “If we get a good sample,” said Gregory, “we let them know. Fresh is always better, I want to stress that, we want it just like you were going to eat it, and you put it in the freezer, because when things deteriorate we have trouble.”

Now I know you can’t go out in the sea and ask a fish how old it is, but if you have his carcass how do you find out how old he is? You filleted him out and he’s still not talking! “That’s why we need the head,” explained Gregory, “in the head they have an ear stone and it’s called an otolith and they put down rings like rings on a tree, and that’s what we use to age the fish.”

Like yearly growth rings?  “Yes,” said Gregory, “and basically the otoliths sit in a sack, in the base of the brain and ride on some little hairs and they act as the fish’s ear bone and they also use it for balance. They are made of calcium carbonate and are every hard. Some of them are quite large, the fish in the drum family, the trout and the drum have very large otoliths, Spanish mackerel and bluefish are quite small.”

Then what, I asked? “Sometime we can look at them whole with some species, other species we have to cut them with a rock cutting saw. The bone is very hard and can be brittle but it’s hard and we use a diamond wheeled saw, just like you would cut rocks with or metal.”

So you cut through so you can look at the “tree” rings and count them? Yes,’ said Gregory, “usually under the microscope and sometimes it takes a little bit of work to get to that but usually it’s fairly straight forward.”

Gregory noted that in 2015, they had over 1000 fish deposited into the carcass collection program. With Freeman’s Bait and Tackle in Atlantic Beach leading the way.

With all these fish did you have any unexpected results? Any eureka moments? “Yah, actually a really cool one that I didn’t expect. A couple years ago the South Atlantic Fishery Management Council was managing sheepshead, and decided they weren’t going to do that anymore. So the sheepshead was kind of on a hot plate, like what are we going to do with this fish, should we enact some regulations and things like that, so I personally didn’t know a whole lot about sheepshead other than I really like to eat them and I like to catch them and they are hard to catch. So one of the things that we started doing, and we realized and getting sheepshead carcasses, getting the age structures out of the sheepshead was going to difficult, because not many are landed commercially, not many are landed openly recreationally because sheepshead fishermen are pretty secretive. So we added sheepshead to the carcass collection program…amazingly some of these big sheepshead can be quite old. It didn’t really know it before. I did my research and turns out we have some fish that are 30-years old, some 8-, 9-pound sheepshead. That’s a big sheepshead but not extremely rare, but a slow growing fish. They grow pretty quick up to a point, they get a couple of pounds and then they really kind of slow down, so that was the coolest thing it think that I saw what we are doing with these species.”

Do you do tournaments too like the Big Rock Blue Marlin Tournament? “Yes we do,” said Gregory, “we are at tournaments, we were at the Carolina Beach KMT, the East Coast Got ‘em on Classic this weekend, and then I was in Hatteras at a billfish tournament the Hatteras Grand Slam Tournament, so tournaments are another place that congregates recreational fishing and catches and allows us sometimes a good way to sample.”

People always ask what happens to the tournament fish, like from the Big Rock. “We would consider blue marlin a rare event species,” explained Gregory, “not very many are landed. Matter of fact there is a federal law that says only 250 blue and white marlin can be landed in the Atlantic by US fishermen, and we only land about 160-, 170-fish a year. So we take every opportunity that we can to get information off these fish.”

So when nine blue marlin were landed in the Big Rock Tournament this year (2016) that’s a pretty significant number then?  “It is,” agreed Gregory, “but what we do is to work with the North Carolina Governors Cup  program that the DMF has with the state’s big bill fish tournaments throughout the state and what we’ve done is along with the Big Rock BMT we’ve worked with North Carolina State University to bring researchers to get all the information that we can not only off the blue marlin that are landed but also the other game fish that were landed. So we had this year at the weigh station a whole group of veterinary technicians, we had biologists, there were probably a dozen people working on these fish when they came in. And then the billfish actually go back to the Center for Marine Sciences and Technology lab (CMAST), to the NC State Lab and there is all kinds of information they’re getting off those fish like their diet, tissue and a dozen different things that they are doing all at one time along with their age including the winning 600-pound blue marlin.

So how big is the otolith of a 600-pound marlin? “Well,” said Gregory, “only a couple of millimeters long, they are very difficult to age.”

So if you want to enter the realm of citizen scientist and help our understanding of the North Carolina’s important recreational fish species, it’s time to put your discarded fish carcasses to good use. Fillet it, bag it, freeze it and donate it to the NC Marine Fisheries Carcass Collection Program.

Species to be collected include (15): black sea bass, black drum, croaker, cobia, flounder, gray trout (weakfish),  grouper, red drum, sea mullet (kingfish), sheepshead, snapper, Spanish mackerel, spotted seatrout (speckled trout), striped bass and triggerfish.

Drop off Freezer Locations (13): Jennette’s Pier, Nags Head; Fishing Unlimited, Nags Head Causeway; Frank and Fran’s, Avon; East Side Bait and Tackle, Washington; Cape Pointe Marina, Harker’s Island; Freeman’s Bait and Tackle, Atlantic Beach; Dudley’s Marina, Cedar Point; The Tackle Box, Southport; Frisco Rod and Gun, Frisco; Red Drum Tackle, Buxton; East Coast Sports, Surf City.

For more information on the Carcass Collection Program, log onto: http://portal.ncdenr.org/web/mf/carcass-collection.

Posted by & filed under Articles, Fishing.

 

 

Internal Guidelines for Adaptive Management for Cold Stun Closures

Dec. 14, 2016

I. Issue

         Since 2011, the North Carolina Division of Marine Fisheries (NCDMF) has followed a set of guidelines to determine if closing the spotted seatrout commercial and recreational fisheries after severe winter cold stun events are warranted (NCDMF 2012). The decision to close the fishery is left to the discretion of the director after significant cold stun events have been reported in at least four North Carolina counties. There were reported cold stun events during the winter of 2014-2015, but it was determined a closure was not warranted. Afterwards, members of the public expressed concern with the current guidelines, citing a perceived subjectivity by the NCDMF staff and its director when classifying a cold stun as “significant.

II. Origination

         After the winter of 2014-2015, members of the public and the North Carolina Marine Fisheries Commission (MFC) expressed concern over the current cold stun closure guidelines and voiced a desire to change the current strategy. Subsequently, the director instructed NCDMF staff to investigate alternative options for spotted seatrout cold stun closures, including a more quantifiable metric to trigger action.

III. BACKGROUND

         Spotted seatrout (Cynoscion nebulosus) and other finfish that over-winter in estuarine environments in North Carolina are susceptible to periodic cold stun events. These events are caused when water temperatures fall below a fish’s metabolic thermal minimum, inducing loss of equilibrium and immobilization. If periods of sub optimal water temperatures persist and fish are unable to move to warmer waters, mortalities can occur. In North Carolina, coldstun events can be triggered by snow and ice melt following a winter storm or by prolonged below average air temperatures from periodic arctic cold fronts. The former is more characteristic of early winter cold stuns where water temperatures in creeks and bays can change rapidly from cold water runoff, and the latter is more typical later in the winter when water temperatures gradually fall below the optimal temperatures for the fish and induce cold stun from long-term exposure. Cold stun events can be localized to single river systems, and even individual tributaries; or they can be widespread across multiple estuaries or even statewide if conditions are right. Mortalities from cold stuns have been identified as a factor contributing to variable natural mortality in spotted seatrout (Ellis 2014; NCDMF 2009, 2015). It has been suggested that declines in spotted seatrout abundance may be due, in some part, to mass mortalities from severe cold stuns. Mass mortality events observed in North Carolina from cold stuns have been an historical occurrence and have occurred as recently as the winters of 2000, 2002, 2004, 2009, 2010, 2011 and 2015.

                                                                                                                                                                                                                                  

As a response to the results of the 2009 Spotted Seatrout Stock Assessment and public concern over the detrimental effects of frequent cold stuns on the spotted seatrout stock, the MFC, upon its approval of the Spotted Seatrout Fishery Management Plan (FMP), decided not to develop a protocol for cold stun closures. Rather, the MFC instructed the director to “Remain status quo with the assumption that the Director will intervene in the event of a catastrophic event and do what is necessary in terms of temporary closures by water body” (NCDMF 2012). Subsequently, the director instructed NCDMF staff to develop an adaptive management approach for determining when a closure was necessary and the duration of that closure. Lead staff and the Spotted Seatrout Plan Development Team (PDT) developed the current guidelines with input from the MFC (February 2012). Currently, for the director to issue a proclamation to close the spotted seatrout fishery, verifiable cold stunned fish must occur in at least four counties. If this condition is met, at the director’s discretion the fishery is closed until June 15 of the following spring. Keeping the fishery closed until late spring affords mature fish that survived the winter the opportunity to spawn at least once before the fishery reopens.

                                                                                                                                                                                                                                   

   Since the first FMP for spotted seatrout (NCDMF 2012) and the development of the cold stun closure guidelines, the director has issued proclamations closing the commercial and recreational spotted seatrout fisheries twice for meeting the conditions triggering action outlined in the guidelines (Proclamation FF-7-2011; FF-30-2011; FF-9-2014). During the winters of 2011 (December 2010 — January 2011) and 2014 (February 2014), cold stunned fish were observed in many coastal counties and air and water temperatures remained very low for days to weeks. During these events, members of the public expressed desire to have the fishery closed and NCDMF was confident that the cold stun was wide-spread and severe enough to warrant a closure under the cold stun closure guidelines.

                                                                                                                                                                                                                                  

          During the winter of 2015 (February 2015), cold stunned fish were observed in some of the southern Neuse River tributaries, Bay River, and southern Hyde County bays. Cold stunned fish were localized to small tributaries mostly on the southern portion of the river systems. Most reports of stunned fish from the public were unverified or inconsistent with what was observed by NCDMF staff in the field. For this event, NCDMF staff determined that the four-county threshold was not met and the director did not choose to close the fishery. This decision was unpopular with some members of the public. Their opinion was that the low landings from 2015 were a direct result of the cold stun that occurred earlier in the year and a closure may have saved more adults for the spring spawn. The public expressed frustration with the perceived subjectivity of a significant cold stun event and the decision to not close the fishery under the current closure guidelines. The director then asked lead staff to develop an adaptive management approach that was more objective and quantifiable.

 

IV.Discussion

 

         Until recently, empirical estimates of sublethal thermal minimums and lethal acclimated chronic exposure times were not available for spotted seatrout in their northern range. Anweiler et al. (2014) exposed hatchery reared age-0 fish to rapid declines in water temperature (1 °C [1.8 °F]/day) to determine the absolute lethal minimum and also chronic exposure to static and fluctuating sub lethal temperatures (5.25°C [41.5°F] and 4.25°C [39.7° F]) to evaluate prolonged lethal exposure. Fish lost equilibrium at an average critical thermal temperature of 3.57°C ± 0.24°C (38.4°F ± 0.43 °F) and suffered mortality at an average temperature of 3.08 °C ± 0.31°C (37.5 °F ± 0.56 °F). Survival was significantly different between the two static temperature treatments with the highest mortality occurring at 4.25°C (39.7°F). However, fluctuations around the temperatures did not have a significant effect on survival compared to the static treatments. Ellis et al. (2016; in review) took this experiment a step further and introduced the covariate of salinity as well as performing the experiments with larger age-0 and age-1 fish harvested from North Carolina estuaries. They observed that fish exposed to rapid changes in water temperature (1 °C [1.8 °F]/hour) lost equilibrium at temperatures ≤ 3.5°C (38.3°F), similar to the Anweiler et al. (2014) study. Mortality induced from long-term exposure was evaluated at three discrete temperatures (3°C [37.4°F], 5°C [41°F], and 7°C [44.6 °F]) and two salinities (10 and 30 PSU) for a 10-day period. Salinity did not have a significant effect on survival within each of the temperatures but survival across all the temperature treatments was different. All fish exposed to 3 °C (37.4 °F) water did not survive after two days with an estimated 50% probability of survival after one day. At 5 °C (41 °F), most fish survived up to five days before mortalities started to occur and by day eight estimated survival probabilities fell below 50%. Mortalities were low for fish exposed to 7 °C (44.6 °F) with survival probabilities of approximately 90% at the end of the 10-day period.

                                                                                                                     

          Ellis et al. (2016; in review) then developed a temperature-based model for predicting the natural mortality (M) of spotted seatrout in the winter based off of the laboratory results and observed estimates of natural mortality from tagging data. Natural mortality based on the annual cumulative cold degree days of <7 °C and <5 °C was modeled for the winters of 1994 – 2015 using water temperature data collected from the National Estuarine Research Reserve at Zeke’s Island, North Carolina. The results were compared to observed estimates of M from previous tagging work (Ellis 2014) for the four years it was available (Figure 1). Cumulative degree days at <7 °C and <5 °C for the years modeled varied widely with some years never reaching the temperature thresholds, while others met or exceeded the eight-day exposure limit for 50% survival at 5 °C by almost twofold. In years where confirmed cold stun events occurred, the model predicted high M and CDD exceeded the eight-day threshold. Modeled estimates of M highly associated with observed estimates inferred from tagging data for both the <7 °C (P=0.003) and <5 °C (P=0.004) metrics. Overall, low temperature metrics (CTM and exposure) inferred for spotted seatrout from laboratory experiments are consistent with observed patterns of winter severity and mortality and may be useful for evaluating the impact of future cold stun events to the spotted seatrout stock.

                                                                                                                     

          Figure 1. Taken from Ellis et al. (2016; in review). Minimum winter (November – February) mean daily temperatures (A) and cumulative cold degree days (CDD) of temperatures < 7 °C (black) and < 5 °C (grey) occurring during the winter period (B). Horizontal line indicates the laboratory estimates of critical thermal minimum (3.57 °C ± 0.24°C) and 50% mortality at 5 °C over eight days for panels A and B, respectively. Rate of natural mortality (M) of spotted seatrout estimated for each winter using the predictive model developed with both temperature metrics (black and grey lines), observed natural mortality inferred from tagging data (open circles), and the Lorenzen weight-based estimate of winter natural mortality used during the previous spotted seatrout stock assessment (NCDMF 2012). Asterisks next to winter periods denotes years where cold stuns were have known to occur.

                                                                                                                     

          In 2015, the NCDMF started a comprehensive, statewide water quality monitoring program (program 909) and deployed a statewide array of continuous water temperature loggers and data sondes. A total of 80 loggers at 55 stations measure water temperature every 15 minutes. Station locations are distributed throughout coastal North Carolina with specific locations that staff felt were representative of the riverine and estuarine systems they were in and locations of historical occurrences of cold stuns (Figure 2). At depths greater than 2 meters, two loggers were placed to monitor temperatures at the surface and bottom to help managers identify water column stratification and turnover events. In addition to the 80 temperature loggers, the NCDMF also deploys and maintains around 25 water quality data sondes that also collect water temperature data. These sondes are located mostly in Albemarle and Pamlico sounds and are used for monitoring water quality for alosine habitat and artificial reef conditions.

 

Figure 2. Locations of NCDMF water temperature loggers in coastal North Carolina.

        

          Given what is now known about spotted seatrout temperature tolerances and available water quality data from the NCDMF temperature loggers and data sondes, more quantitative information can be used in determining the necessity of a fishery closure. Better understanding of spotted seatrout physiology can allow for quantitative temperature triggers that incorporate estimated probabilities of survival to provide the director with a measurable metric to inform his decision on a spotted seatrout fishery closure. However, due to unequal distribution of spotted seatrout throughout its overwintering habitat, a closure should not be based on temperature alone. The reported presence of cold stunned fish should also be considered when making this decision.

                                                                                                                     

          The spatial extent of cold stun events should be considered when evaluating the efficacy of a fishery closure. Historically, cold stun events have varied in their spatial coverage and have ranged from a few isolated creeks in one river system to multiple riverine and estuarine systems. Wind and tidal influences on water temperature can cause areas on the windward side of a river or estuary to turnover and trap fish in tidal creeks and bays causing rapid drops in water temperatures and inducing a cold stun. An example of this phenomenon occurred during the winter of 2014-2015 in the Neuse River. Strong northerly winds coupled with below average air and water temperatures acted to “push” cold surface waters south into the creeks around Havelock. This cold water displaced the warmer water in the creeks and caused a water column turnover event trapping spotted seatrout and many other fish species in the headwaters of the creeks and causing a localized cold stun event. However, on the leeward side of the river, water temperatures did not change drastically and no cold stunned fish were observed or reported. Cold stun events can also occur over large areas of the state when light winds and clear night skies, along with prolonged below average air temperatures, act to cool the water down. This gradual decrease eventually drops bottom water temperatures to a point that can be lethal to spotted seatrout. These cold stun events can affect the entire coast causing catastrophic losses in all major riverine and estuarine habitats.

                                                                                                                                                                                                                                   

         The spotted seatrout fishery has only been closed twice in the history of the state due to population concerns from cold stun events, both occurring in the last decade in 2011 and 2014. However, cold stun events have occurred in North Carolina for centuries with written reports since colonial times (Lawson 1709). The life history of spotted seatrout is well suited for high and variable rates of annual mortality and often population level impacts from cold stun events are only evident for the year directly following a cold stun event (Figure 3). However, years with back to back cold stun events can prolong a rebound of the population. The original intent behind closing the spotted seatrout fishery was to protect mature fish from harvest after a cold stun to allow time for the fish to spawn and hopefully encourage the rebound of the population. Yet, rebounds in the population have been observed as early as the following year after cold stun events where no closure was instituted and commercial and recreational regulations were less strict than today. Additionally, it is difficult to determine if a closure significantly affects recruitment of fish the following year due to the current spotted seatrout assessment terminal year of 2012 (only one closure in the time series) and the difficulty of incorporating water temperature effects on natural mortality into the model. Not having an option to close the spotted seatrout fishery after a significant cold stun event goes against the recommendations of the MFC and comments from members of the public. Because this option would be against the recommendation of the MFC, it is not considered a viable option for the NCDMF adaptive management approach to cold stun closures and is presented here for informational purposes only.

 

Figure 3. Predicted spawning stock biomass (SSB) for spotted seatrout annually from 1991-2012. Circles indicates years when cold stun events occurred (NCDMF 2015).

                                                                                                                                                                                                                                  

          Maintaining status quo with the current cold stun closure guidelines would be against the desires of the public. The inherent subjectivity of the current closure guidelines creates a loss of trust between the public and fisheries managers of the state and does not allow for objective, quantifiable metrics to inform the decision of a fishery closure. Also, current closure guidelines do not allow for regional closures, only statewide closures. This adversely affects fisherman in areas of the state where no cold stun has occurred and the impact to the local spotted seatrout population is minimal. However, the recommendation from the MFC for management of cold stuns gives the director the authority to close the fishery in the state, by region, if they so choose after a significant cold stun event. The director has never closed the fishery by region because cold stun closures have been issued under the current guidelines which require at least four counties to experience significant cold stuns. The areas of the state that are most frequently impacted by frequent, severe cold stuns are located in a few, large coastal counties. Closures under the four-county guidelines preclude regional closures because to meet the four-county threshold, so much of the state’s waters would have to be impacted and a statewide closure is usually the most prudent option. A modification of these guidelines to remove the four-county threshold will provide the director the opportunity to close the fishery by regions after significant cold stuns are reported. These regions can range in size from specific water bodies to statewide at the director’s discretion.

 

 

                                                                                                                              Given new information available about spotted seatrout temperature tolerances, mortality probabilities to sub optimal temperature exposure, and available continuous water temperature monitoring, management options can now incorporate quantitative thresholds to trigger closures. There is also the option to have these closures vary by spatial extent from statewide to individual river systems. Based on survival probabilities generated by Ellis et al. (2016; in review), average water temperature and exposure triggers of 5°C (41° F) at eight consecutive days and 3 °C (37.4 °F) during a consecutive 24-hour period should be considered. At these water temperature and time combinations, it is reasonable to assume that about half the fish exposed to these temperatures will succumb to mortality. When temperature triggers are met and cold stunned fish are observed and verified by NCDMF staff within a management unit, the fishery could be closed in that unit until the following spring. A statewide closure will protect all spotted seatrout in North Carolina ensuring that areas that do not have water temperature monitoring coverage but may still experience cold stun conditions are protected. However, this strategy will cause fishing opportunities to be lost in areas that may not be affected by cold stun conditions.

                                                                                                                      

         A regional approach incorporating the 5 P°PC (41 °F) at eight consecutive days and 3 °C (37.4 °F) during a consecutive 24-hour period within a management unit could preserve fishing opportunities in unaffected areas and protect surviving fish in areas where cold stun events occurred. Tagging and genetics data suggest that spotted seatrout exhibit high site fidelity to their natal estuary with periods of greater movement during the spawning season (Ellis 2014; O’Donnel et al. 2014; Ward et al. 2007; Bradley and Chapman 2003). This, coupled with the limited movement of spotted seatrout during the winter months (Ellis 2014), support that the effects of a cold stun may vary regionally. By splitting the state into cold stun management zones, largely based on major riverine and estuarine systems, managers will have the ability to close areas where cold stun events occur while preserving fishing opportunities in others. However, fisherman from a closed area may move to an open area shifting and concentrating the effort and fishing mortality from one area to another.

                                                                                                                                                                                                                                   

         Cold stun closure regions should be broad enough spatially to encompass major estuarine and riverine systems where spotted seatrout overwinter and allow for adequate protection from fishing pressure after a closure is enacted until the following spring spawn has begun. The closure should extend through the peak of the spawning period of spotted seatrout and the closed region should be broad enough to protect fish from fishing pressure in the cold stun-affected area, as well as in areas where the species aggregates to spawn. In North Carolina, spotted seatrout spawn near seagrass beds, sandy banks and oyster reefs in and around creek and river mouths from April until October, with a peak spawn occurring around May and June (Burns 1996; Luczkovich et al. 1999). If possible, currently delineated management areas that meet the previously stated characteristics should be considered for cold stun closure regions. Continuity of management units among different management programs would aide Marine Patrol in enforcement of closures due to familiarity of boundaries and not burden fisherman with learning additional boundaries. The estuarine gill net management areas used by NCDMF to manage the estuarine gill net fishery for sea turtle interactions meet all of these considerations. The management units were delineated based on the similarity of fisheries occurring within them, similar water quality and habitat conditions, and the ability of NCDMF Marine Patrol to monitor fishing effort (NCDMF 2013; NCDMF 2014b). The spatial extent of these units are broad enough to cover the primary riverine systems of the state that are typically impacted by cold stuns and allow enough spatial coverage to protect fish spawning in these areas before the fishery is opened after a closure. However, for the estuarine gill net management units, the central portion of the state was divided into four regions based on historical sea turtle abundance in western Pamlico and Core sounds. For the purposes of cold stun closures, NCDMF staff decided to combine units B, C, D1, and D2 into one management area (Figure 4). The new cold stun management areas combine the major riverine and estuarine regions of the state into three discrete spotted seatrout cold stun management areas:

  • Area 1 includes the Albemarle Sound and all its tributaries including Crotoan, Roanoke, and Currituck sounds;
  • Area 2 encompasses all of Pamlico Sound, Tar-Pamlico and Neuse rivers and their tributaries, and all coastal waters in Carteret County from the Highway 58 bridge east; and
  • Area 3 includes all of the southern coast south of Highway 58.

 

                                                                                                                      

         These broad management areas allow for affected fish, if they survive, to recover and spawn the following spring with the reasonable expectation that they will not be persecuted by a fishery within that area due to their limited movement during this time.

Figure 4. Map of the Spotted Seatrout Cold Stun Management Areas.

                                                                                                                                                                                                                                  

          Water temperature loggers require physical download to retrieve water temperature data which can delay the response time of NCDMF staff when investigating cold stun events. To speed up the time it takes to compile the water temperature information needed to make a decision on a fishery closure, NCDMF staff will monitor air temperature, weather forecast, and winter precipitation events during the winter months and download data from loggers when conditions are favorable for cold stuns. The cold stun of 2010-2011 occurred after a winter storm that covered much of eastern North Carolina in snow and ice and caused ice to accumulate on many creeks and shallow bays. The subsequent runoff of melted snow and ice entered the creeks and estuaries causing drops in water temperatures, which led to the severe cold stun event that occurred that winter. In contrast, the cold stun in February of 2014 occurred during a long period of below-normal air temperatures which gradually caused water temperatures to drop across the state. To ensure a timely response to future cold stuns, NCDMF staff will begin to download water temperature loggers and monitor coastal waters for affected fish when weather conditions when similar weather conditions are expected.

                                                                                                                                                                                                                                  

          The director has managed spotted seatrout fishery closures under the current closure guidelines with the interpretation that a significant cold stun event has to occur in at least four counties statewide before a closure is warranted. Ambiguity among the public and NCDMF staff over what constitutes a significant cold stun event in North Carolina has caused public concern. To remove some of the inherent subjectivity in deciding if a cold stun is significant, a quantifiable measure of the number of stunned or dead fish is needed. The North Carolina Division of Water Resources (NCDWR) monitors and reports on fish kill activity across the state and has developed protocols for classifying fish kills. NCDWR classifies a fish kill as at least 25 fish affected and verified by trained staff (NCDWR 2015). Cold stunned spotted seatrout in natural settings can vary in their observed condition from visably lethargic and slow to respond to external stimuli, to visable leisons and necrotic skin, to dead and rotting. Cold stuns ususally affect all spotted seatrout within an area and it can be assumed that if less than 25 cold stunned fish are observed and verified, then the number of spotted seatrout in that area is low and the impacts from a cold stun would be minimal.

V. Guidance

                                                                                                                      

         Manage cold stun closures for spotted seatrout regionally (Figure 4) through an adaptive approach, taking into consideration:

  • The size and scope of a kill and temperature exposure;
  • The rate at which water temperature can change from cold-water runoff or prolonged below-average air temperatures; and/or
  • The evaluation of water temperatures and exposure triggers of 5°C [41°F] at eight consecutive days and 3°C [37.4 °F] during a consecutive 24-hour period.

VI. LITERATURE CITED

 

Anweiler, K. V., S. A. Arnott, and M. R. Denson. 2014. Low-temperature tolerance of juvenile spotted seatrout in South Carolina. Transactions of the American Fisheries Society. 143:999-1010

Bradley, A. W and R. W. Chapman. 2003 “Population structure of spotted seatrout, Cynscion nebulosus, along the atlantic coast of the U. S.” Biology of spotted seatrout, Edited by S. A. Bortone. CRC PressBoca Raton, Florida. 31-40 p.

Burns, B. 1996. Life history aspects of marine recreational fishes in North Carolina. North Carolina Department of Environment and Natural Resources, Division of Marine Fisheries, Project F-43, Morehead City, North Carolina. 25 p.

Ellis, T. A. 2014. Mortality and movement of spotted seatrout at its Northern latitudinal limits. Dissertation North Carolina State University. 258 p.

Ellis, T. A., J. A. Buckel, J. E. Hightower, and S. J. Poland. 2016. In review. Relating cold tolerance to winterkill for spotted seatrout at it northern latitudinal limits. Journal of Experimental Marine Biology and Ecology.

Lawson, J. 1709. A new voyage to Carolina. London, England. 270 p.

Luczkovich, J. J. R. C. Pullinger, S. E. Johnson and M. W. Sprague. 1999. Identifying the critical spawning habitats of sciaenids using passive acoustics. Transactions of the American Fisheries Society, 137: 576–605.

North Carolina Division of Marine Fisheries. 2009. Stock Status of Spotted Seatrout, Cynoscion nebulosus, in North Carolina, 1991-2008. NCDMF, Morehead City, North Carolina. 90 p.

North Carolina Division of Marine Fisheries. 2012. North Carolina Spotted Seatrout Fishery Management Plan. NCDMF, Morehead City, North Carolina. 344 p.

North Carolina Division of Marine Fisheries. 2013. Application for an individual incidental take permit under the endangered species act of 1973. NCDMF, Morehead City, North Carolina 154 p.

North Carolina Division of Marine Fisheries. 2014. Application for an individual incidental take permit under the endangered species act of 1973. NCDMF, Morehead City, North Carolina 165 p.

North Carolina Division of Marine Fisheries. 2015. Stock Assessment of Spotted Seatrout, Cynoscion nebulosus, in Virginia and North Carolina Waters. NCDMF, Morehead City, North Carolina. 142 p.

North Carolina Division of Water Resources. 2015. North Carolina Division of Water Resources Annual Report of Fish Kill Events 2015. NCDWR, Raleigh, North Carolina. 16 p.

O’Donnel, T. P., M. R. Denson, and T. L. Darden. 2014. Genetic population structure of spotted seatrout Cynoscion nebulosus along the Southeastern U.S.A. Journal of Fish Biology. 85:374-393.

Ward, R., K. Bowers, R. Hensley, B. Mobley, and E. Belouski. 2007. Genetic variability in spotted seatrout (Cynoscion nebulosus), determined with microsatellite DNA markers. Fisheries Bulletin. 105:197-206.

This document was prepared by Steve Poland (Steve.Poland@ncdenr.gov) with input from the NCDMF Spotted Seatrout Plan Development Team and Management Review Team.