Historically fishermen kept larger fish and left smaller juvenile fish.Over time the average size of the fish would

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Selectively targeting larger fish and leaving smaller juveniles would result in natural selection favoring smaller fish. This is because the larger fish are more likely to be caught and removed from the population, while the smaller fish have a greater chance of survival and reproduction. Over time, this continual selection pressure would result in an overall decrease in the size of the fish population.

Historically Fishermen Kept Larger Fish and Left Smaller Juvenile Fish