As far as I know, Fishing has been one of the important occupation since early ages, and infinite number of fishes have already been captured.
As the time passes, they must've developed some sort of knowledge about the fish-nets, and should've figured out a way to escape from them. But, still now, we are able to capture them at the same rate(I guess)
So, Are they developing any sort of hereditary memory to escape from us?
P.S. I'm not sure whether this is the right SE to ask.