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Most likely ALL their behavior for migration behavior is inbred (in the genes) so the only real way for a fish to "learn" is not to move to some strange/unkown area due to fishing pressure but to learn the ultimate way: DEATH! The next generations of fish then learn to stay offshore during migration cause that is the way it has always been for them. Less and less fish are inbred to migrate close to shore and in the range of the dredded plug with hooks. With the canal it is likely a numbers game, enough fish make it through the ditch to keep the route passing from one generation to the next. You canal rats can't catch them all even though you think you do.
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Given the diversity of the human species, there is no “normal” human genome sequence. We are all mutants.
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