LouisB,
In my case we were not catching any fish below about 30 feet. They were coming up in the water column chasing bait. As soon as we released them they swam quickly down and did not linger near the surface. We were using fairly heavy equipment so brought the fish in and released quickly. There is a problem if you are catching them deep, say 50 feet or more, and bring them to the surface too fast. Swim bladder expands and they are too buoyant to get back down deep.
