You do not see trout with birth defects because they get eaten very early in life, more than likely by there siblings. To say say fish do not directly inherit genes from there parents is(I'm at a loss for words here) were else are they going to get them? Does every fish in the sea look alike? Ofcourse not. Why, because of natural selection and evolution. Good traits are passed on, bad traits die out. From this new species develop.
W. Even in the worst habitat some trout will grow bigger than the rest and pass there traits on. The better the gene pool the more trophys there will be. The more trophys you release the more they will spawn the better your gene pool will be.
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