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FWC How to Catch and Release Fish for Maximum Survival – Video

Throughout its 8,500 miles of marine coastline and more than 2,500 artificial reefs, Florida boasts an abundance and diversity of fish species. Every fish that swims in our waters ranks as a vital and valuable resource. With more anglers and better equipment available, catch and release fishing has become essential to ensuring there will always be adequate stocks of fish to catch. Each of us must take a hands-on approach every day we are on the water to help conserve our fisheries by practicing catch and release fishing whenever possible.
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Learn how you can help reduce catch and release mortality.

Fishing effort in Florida has increased dramatically over the past decade and is forecast to continue as Florida’s resident population of 14.7 million increases daily by about 1,000 people. More than 40 million tourists visit the state annually, most with coastal destinations. Fishing is a favorite pastime of Florida’s residents and visitors, and in 1997, saltwater anglers made about 24 million fishing trips and caught 141 million marine fishes, 71.5 million of which were released. Because increased exploitation could negatively impact Florida fisheries, scientists and managers must remain diligent and innovative in their efforts to utilize fishery resources wisely and conservatively.

Managers of Florida’s fisheries use a combination of traditional regulations to control harvests and protect fish stocks. These measures include bag limits, minimum and maximum sizes, closed seasons and areas, and in some cases, no harvest is allowed unless a special permit is purchased. Bag limits reduce the number of fish that are harvested and allocate the catch over time so that the year’s total harvest is not taken in one season. Aggregate bag limits are sometimes applied collectively to a complex of species such as grunts and snappers, so that the community is not overfished. Minimum and maximum sizes, or “slot,” limits protect sexually immature fish and may be imposed to create a “trophy” fishery, i.e., a fishery that produces extremely large individuals. Closed seasons and closed areas protect a species during spawning, especially when fish return yearly for spawning at known locations. The “no harvest” rule is implemented when a stock or species, for example, Goliath Grouper (jewfish), is severely overfished. To succeed, Florida’s fisheries management strategies of size limits and closed seasons depend on the survival of fish that are caught and released. The fate of hook-and-line caught fishes that are released largely depends on the expertise and dexterity of the angler. Anglers practicing a few straightforward and intuitive techniques can increase survival of released fishes.

“Limit your kill; don’t kill your limit!”
After being caught and released by an angler, fish may die for a variety of reasons. The most common causes of death are the physiological stresses caused by the struggle during capture and injuries caused by the hook or the angler. Some fish may die even though they appear unharmed and despite efforts at revival. Fish that struggle intensely for a long time during capture are usually exhausted and stressed from the accumulation of excessive amounts of lactic acid in their muscles and blood. Severe exhaustion causes physiological imbalance, muscle failure, or death. Therefore, use the proper weight-class tackle; land your catch quickly, and when possible, leave the fish in the water while you release it. Any exhausted animal needs oxygen to recover!

Hook wounds may appear minor to anglers, but damage to the gills, eyes, or internal organs can be fatal. If the fish is hooked deep in the throat or gut, research shows that it is best to cut the leader at the hook and leave the hook in the fish. Prolonged attempts to remove the hook often do more harm than good. In the Fish and Wildlife Research Institute’s (FWRI)* study of release mortality in snook, 24 snook were deep hooked. We removed the hooks from 12 snook, and we left the hook intact and cut the leader in the other 12 snook. We found that four of the 12 deep-hooked snook died after the hooks were removed. None died when we simply cut the leader and left the hook alone. Fish are capable of rejecting, expelling, or encapsulating hooks. Encapsulation is a process whereby the fishes’ healing process causes the hook to be covered with an inert matrix of calcified material; or a-cellular tissue. Steel and bronze hooks are less toxic and are rejected or “dissolved” sooner than are stainless steel and cadmium-plated or nickel-plated hooks.

Two types of hooks, barbless and circle hooks, are known to reduce injury and mortality of released fishes. Barbless hooks reduce tissue damage and handling stress because they can be removed quickly and easily. Barbless hooks are popular in the freshwater trout fisheries and are becoming increasingly popular with saltwater anglers. A Florida study conducted on snappers and groupers demonstrated that catch rates are the same for barbed and barbless hooks. If barbless hooks are not available, simply use pliers to crimp or remove the barbs from regular hooks. A caveat is called for when using these types of hooks: after having hooked your quarry, don’t give the fish any slack, because it will be more likely to escape from barbless hooks than from regular hooks.

The use of circle hooks has been researched and compared to regular hooks-often called “J” hooks-in several fisheries. In all of them except in the flatfish, or flounder, fishery, circle hooks were shown to result in significantly lower hooking mortality and higher catch rates. In one study, tunas and billfishes were hooked in the jaw 90% of the time. Circle hooks reduced deep hooking fourfold in the striped bass fishery while “J” hooks were 21 times more likely to cause a bleeding injury. Circle hooks are a bit more tedious to use, especially with live bait, but the advantages should compel anglers to give them an honest trial. Overall, research shows that circle hooks improve catch rates and reduce hooking mortality which results in positive impacts on exploited fish stocks.

Studies on striped bass, spotted seatrout, and snook have shown that live bait was used in most cases of hook-related mortality and that “gut hooking” was the primary cause of death. Artificial lures are generally in motion, so the fish takes the bait and the hook is set before the lure can be swallowed. To avoid internal damage from gut hooking, when you use live or dead bait try to set the hook immediately; with natural bait, there is less motion-the fishes’ immediate reaction is to swallow the bait. If you allow the fish to run with the bait, the chances of gut hooking the fish increase.

Survival rates for some Florida fishes
Controlled studies have shown that most fish released after hook-and-line capture, survive. Researchers working in Boca Grande Pass tagged 27 tarpon with sonic transmitters and found that 26 of these hook-and-line-caught fish survived. The one fish that died had been lifted from the water for a prerelease photograph. Scientists repeatedly caught bonefish held in a large pond in the Florida Keys and found that 96% survived capture. A few of the bonefish that ultimately died had been caught five to ten times each, which suggests that bonefish hooked and released in the wild probably have an even higher survival rate. Angler-caught snook held in large net-pens throughout Florida had a 98% survival rate. Most of the snook that died were caught with live bait, consistent with studies showing that fish caught with lures generally survive. Spotted seatrout caught in Tampa Bay had a 95% survival rate. Hook position affected survival rates; trout hooked in the gills or gut had lower survival rates than those hooked in the mouth. Redfish survival rates range from 84% in Georgia waters to 96% in Texas waters. Like seatrout, hook position affected survival rates; more than 50% of the throat or gut hooked fish died. These studies demonstrate that catch and release fishing works-most fish that are released survive. By following a few simple guidelines, anglers can maximize survival rates.

Venting distended gas bladders
Release of sublegal-sized groupers and snappers is imperative because of increased minimum sizes and implementation of bag limits. When these fishes are hauled from depths greater than about 30 feet, their air bladders become distended and many times cause their stomachs to evert, or turn inside out, through their mouths. Research is inconclusive regarding the benefits of venting snappers. The uncertainty may be due to injury of internal organs resulting from improper insertion of the venting tool into these narrow-bodied fishes. In snappers, to avoid puncture of the heart, liver, intestine, or gonad, it is crucial to insert the needle or cannula just posterior to the tip of the pectoral fin. Groupers, being wider bodied, better survive deflation, and venting has been shown to positively increase their survival. The technique is the same for both kinds of fishes.

The venting device should be a hollow needle no longer than 1½ inches with an inside diameter of about 1/8 inch or less, anything much larger and you run the risk of improper healing or infection. Puncture the body wall at the tip of the pectoral fin until you hear the escape of trapped air. The angle should be about 60-75 degrees, which improves the ease of insertion. Do not insert the needle too deep. If resistance is encountered, stop and try in a slightly different location or angle. Leave the needle in place until you are sure that most of the swelling or distension has been relieved. Never puncture the stomach or try to force the stomach back into the body. The fish will accomplish this better than we ever could!

Small, narrow-bodied fishes such as porgies, grunts, angelfish, and most snappers do well if they are simply returned to the water as quickly as possible. A study conducted in the Florida Keys showed that over 90% of individuals of these species are able to return to the bottom without venting. Survival of groupers, tilefish, and large snappers is increased when their distended gas bladders are vented.

Some guidelines for catch and release angling
The most important steps an angler can take to ensure a successful release are to hook and land the fish as quickly as possible, leave the fish in the water while removing the hook, and release the fish quickly. There are several other ways to improve survival rates:

Practice and share these techniques! Teach your children and inexperienced anglers these few simple procedures to help ensure abundant fish populations for the future.


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