catch and release question

[joshua78]

So I'm watching one of the fishing shows and the guy starts talking bout how catch an release is a good thing, which I agree with. He then however goes on to say throw the bigger older fish back and eat the young ones. This idea makes no sense to me. If everybody was eating the young ones, and leaving the old ones, wouldn't that hurt a fish population more? At some point the old ones are gonna die anyway and you've already eaten the young ones that were meant to replace the previous generation. Not trying to start an argument with my first post, just would like some clarification on this theory.
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