barotrauma

Photo provided

This red snapper is showing clear signs of barotrauma. That’s the stomach, not the swim bladder, protruding from its mouth.

the Florida Fish and Wildlife Conservation Commission

It’s that time of year when you might be fishing for snapper and grouper. Continue your role as a conservationist by looking out for fish with signs of barotrauma and being prepared to respond.

Barotrauma is a condition seen in many fish caught in waters greater than 50 feet that is caused by expansion of gases in the swim bladder. Signs of barotrauma include the stomach coming out of the mouth, bulging eyes, bloated belly and distended intestines.

It’s important to know in advance what tools are available and how to use them to help fish return to the bottom and increase their chances of survival.

Descending devices can be used by anglers to take fish back down to depths where increased pressure from the water will recompress swim bladder gases. They fall into three categories: Mouth clamps, inverted hooks and fish elevators. Learn more about descending devices and how to use them at MyFWC.com/SaltwaterFishing by clicking on the “Fish Handling” then “How-to Videos” or scrolling to “Barotrauma.”

Venting tools are sharpened, hollow instruments that anglers can use to treat barotrauma by releasing expanded gas from the swim bladder, enabling the fish to swim back down to capture depth.

Please note, items such as fillet knives, ice picks, screwdrivers and gaffs are not venting tools and should never be used to vent a fish, because they are not hollow tubes that allow air to escape. Venting a fish incorrectly or with the wrong tool may cause more harm than good.

To properly vent, lay the fish on its side (on a cool, wet surface). Insert the venting tool at a 45-degree angle, under a scale 1 to 2 inches behind the base of the pectoral fin, just deep enough to release trapped gases. Never insert venting tools into a fish’s belly, back or stomach that may be protruding from the mouth. Learn how to vent properly by visiting https://youtu.be/jhkzv1_2Bpc.

Descending devices and venting tools should only be used when fish show one or more signs of barotrauma and cannot swim back down on their own. It is essential to work quickly when using these tools and return the fish to the water as soon as possible. Anglers should choose the device and method they are most comfortable with and that best fits the situation.

To learn more about catch-and-release techniques, visit MyFWC.com/Marine and click on “Recreational Regulations” and “Fish Handling.” To learn more about barotrauma, descending devices and venting tools, visit our YouTube channel at MyFWC.com/SaltwaterFishing.

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