ADVERTISEMENT

ADVERTISEMENT

Barotrauma: Understanding the signs of fish distress can mean everything

The causes and effects of barotrauma, how to prevent it and what tools anglers should have to assist distressed fish

Fish in Lake Sakakawea and Devils Lake are more likely to experience barotrauma because these bodies of water are larger and deeper.
Fish in Lake Sakakawea and Devils Lake are more likely to experience barotrauma because these bodies of water are larger and deeper.
Contributed / Twin Ports Walleye Association
We are part of The Trust Project.

DICKINSON — With summer heating up, many a North Dakota angler will head to the many lakes and rivers in search of that exhilarating catch and release of a hefty bass or sparkling, yellow perch.

North Dakota Game and Fish caution anglers to consider their role as conservationist by remaining vigilant and exercising caution for signs of barotrauma.

Barotrauma is a common injury, or barometric pressure trauma, that may occur to a fish as a result of rapid changes in pressures as they are reeled to the surface from water that is 33 feet deep or deeper. Barotrauma injuries may include hemorrhaging of internal organs, loss of vision, torsion of the stomach and more. Ultimately, unrecognized barotrauma can lead to immediate or delayed death.

Bulging eyes, bleeding gills, bubbly skin or an expanded swim bladder protruding from the fish’s mouth are symptoms of barotrauma and failure to identify them means a slow and painful death after the fish swims away.

“With swim bladder damage, the fish can’t keep themselves in equilibrium in the water so there is a fair amount of delayed mortality that anglers don’t see,” said Greg Power, North Dakota Game and Fish fisheries division chief.

ADVERTISEMENT

Not all fish respond the same way to barotrauma, Power explained. Some species, such as largemouth bass, smallmouth bass, white bass, walleye and yellow perch, are more susceptible to barotrauma because they do not have a duct connecting their swim bladder to their stomach. Instead, these fish regulate their swim bladder by releasing gasses through their gills via the bloodstream.

MORE FISHING COVERAGE IN NORTHLAND OUTDOORS:
DNR's annual surveys help determine fish populations, lake management, stocking strategies
Members Only
As outdoors activities go, this would be his last kick at the can for the foreseeable future. Chemotherapy was complete, but a stem cell transplant – an equally arduous step on his journey to recovery – awaited.
In this episode of Northland Outdoors, host Chad Koel launches with tournament walleye anglers Chad Maloy and Dave Wasness to target those fish.
Treyton Thesing of Dover-Eyota and Brady Grupa of La Crescent-Hokah teamed up to win the MLF High School Fishing Open on the Mississippi River near La Crosse last weekend.
More than 2,500 fish have been found dead from a fish kill event that occurred in late July.
The Department of Natural Resources' annual lake trout assessment was the highest ever for western Lake Superior.
Last summer was the year of extreme drought; this summer has been just the opposite.
Brad Durick says its not uncommon for his party to pull 250 to 300 pounds of catfish out of the river each day. While he understands the Red’s reputation, he simply doesn’t agree with it.
In this episode of Northland Outdoors, host Chad Koel heads out to a body of water he hasn’t fished before. By using visual cues, such as points, bulrush, islands and rocks, he narrows down likely locations of where fish are likely congregating.
Members Only
It wasn’t their first choice for a shore-fishing spot, but someone already was set up near the confluence of the Red and Red Lake rivers where they’d braved the heat to fish the previous evening.

Trout, salmon and pike are not as at risk for barotrauma because they do have the useful duct that connects their swim bladder to their stomach, allowing them to expel air to decompress their swim bladder as they are reeled from deep water.

Barotrauma is not prominent everywhere in North Dakota, because most lakes in the area don’t exceed 33 feet in depth. Fish in Lake Sakakawea and Devils Lake are more likely to experience barotrauma because these bodies of water are larger and deeper.

To reduce the risk of this fish fiasco, anglers should avoid catch and release fishing for bass, walleye or yellow perch in areas of deep water. Those who do fish in deep water should intend to harvest all legal fish they catch. Anglers who do practice catch and release fishing should do so in shallow water to increase the likelihood of survival of the fish they release. Puncturing the fish’s swim bladder, also known as venting, has been used by anglers to help the fish swim to its original depth, but this is not a safe option for the fish, Power said.

“Fizzing (venting) and descending tools all sound great…but the reality is that there are thousands of anglers out there,” Power said. “A couple may be able to get that process down and do a good job with it, but it certainly isn’t the right answer. Most people will not take the time to do it right and we strongly recommend against it.”

Descending devices is a tool that can be used by anglers to return fish to depths where increased pressure from the water will assist in recompressing their swim bladder gases. These devices come in three categories, including mouth clamps, inverted hooks and fish elevators.

To learn more about descending devices and how to use them, anglers can watch “How-to Videos” on YouTube by searching for “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.

ADVERTISEMENT

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. 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 1-2 inches behind the base of the pectoral fin, just deep enough to release trapped gasses. Never insert venting tools into a fish’s belly, back or stomach that may be protruding from the mouth.

The North Dakota Game and Fish Department advises exercising caution and understanding the effects of barotrauma to minimize this problem and to extend the long-term health of fish.

"When fishing deep, keep the catch," Power said. "Don’t release the fish in 30 plus feet of water."

For additional information about barotrauma visit https://gf.nd.gov/fishing/barotrauma .

Related Topics: NORTHLAND OUTDOORSFISHING
Amber Neate grew up in rural Skull Valley, Arizona. Her passion of covering sports of all types, including personal favorites wrestling, hockey, rodeo and football, began at an early age.

She obtained her Associate of Arts Degree from Yavapai Community College before attending Northern Arizona University for a three-year journalism program. While at NAU, Neate worked as an Assistant Sports Editor for the Lumberjack Newspaper as well as a hockey commentator for KJACK Radio.

Gaining her experience working for a small community paper, The Wickenburg Sun, as a general news and features reporter, her love for sports and a small-town community brings her to Dickinson to cover southwest North Dakota sports.

LANGUAGES: English
What to read next
The third edition of "Rock Climbing Minnesota" details more than 1,100 routes and includes more voices in each description and more photos of women, people of color and LGBTQ climbers.
Hot temperatures to start the weekend
Standing corn is often talked about as a detriment to deer hunters, to the point where some won't even go into the woods until corn is harvested. Eric Morken of Northland Outdoors details examples of getting on high numbers of does to big bucks around standing corn, along with specifics on how to hunt corn as an archer.
The former DNR official will go to the Minnesota Board of Soil and Water Resources.