Catching deep fish and bringing them up to the surface from deeper than 20 ft will result in the fish being under extreme pressure changes.
This may or may not harm the fish. It depends on how fast you bring them back to the surface and the difference in depth, pressure and temperature. Increases in temperature of the fish can cause dissolved gases in the blood stream to expand and bubble out of solution. And when you decrease the pressure it causes the gases to expand. Bubbles in the blood stream in humans creates the disease called the "Bends".
Now fish are not mammals and are a totally different species so I am not really sure how these gases effect the fish.
But you have to know that Boyle's Law and Charles Laws are a fact of Physics. And a gas reacts to changes in pressure and temperature the same way whether it's inside a fish or a human.
The summer months are the worst time to go catch deep fish if you are concerned about fish populations.
And I am sure many of you who fish for deep water fish have noticed the fish's eye bulging out of the eye sockets and the swim bladder coming out of the fish's mouth. That should tell you that the fish is under extreme stress that may kill said fish.
Originally Posted by fishin350
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