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Outcome of a selection experiment on Tilapia mossambica (redrawn after Silliman 1975). A control population was harvested randomly while another was harvested selectively with respect to size (all individuals >25 mm body thickness) every 2 months over a period of 3 years. At the end, 46 size-matched fish each were reared for 150 days. Males from the selectively-fished population grew much slower than the control, while no such response was apparent in females.
