contemporary evolution
directional selection as human activities change ecosystems. In fisheries, size limits on catches restrict fishing to the larger specimens. In Atlantic cod, for example, this has led to maturity at smaller sizes and, since smaller fish produce less eggs, this hinders recovery of the stock. Arguably, catches should be restricted to medium-sized fish, allowing young to grow to catchable size and for some to survive to be very large and reproductively effective

Dictionary of ichthyology. 2009.

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