Releasing fish with Baratrauma

[bulletbob]

Originally Posted by hammer4reel

FROM GOOGLE


Freshwater fish can experience barotrauma, especially when rapidly brought up from deep depths, but some species are less susceptible due to a physiological adaptation called a pneumatic duct which allows them to release gas from their swim bladder, effectively "burping" to adjust to pressure changes; fish lacking this duct are more prone to barotrauma when brought to the surface quickly.
Key points about freshwater fish and barotrauma:
Swim bladder function:
The swim bladder, a gas-filled organ that helps fish maintain buoyancy, is key to understanding barotrauma.
Physostomous vs. Physoclistous fish:
Fish with a pneumatic duct connecting their swim bladder to their digestive tract (physostomous) can release gas more easily and are less likely to experience barotrauma compared to fish without this duct (physoclistous).
Examples:
Fish less likely to experience barotrauma:
Trout, salmon, and pike have a pneumatic duct and can adjust their swim bladder pressure readily.
Fish more likely to experience barotrauma:
Walleye, perch, and bass lack the pneumatic duct and are more susceptible to barotrauma when brought up from deep water

very good , thanks for the explanation.. I do know that when we crank up a deep water laker, they always seem very "gassy"- you see lots of bubbles coming out of them as they come to the surface..