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So a 60 lb fish produces about 5 times as many eggs as a 12 lb fish according to your numbers. I would argue that keeping the large fish would have less impact on the fishery than keeping the 12 lb fish because the 12 lb fish has a much higher reproductive potential since it will live much longer and therefore reproduce much more often, producing more eggs each time based purely on those numbers. Now the genetic impact of removing large fish is another issue all together and one I don't know enough to comment on.
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