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# IMPACTS OF SELECTIVE FISHING
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Changes in life-history traits have been observed in many exploited fish species over past decades. This led to the ‘fisheries-induced evolution’ hypothesis proposing that fisheries may be causing genetic changes to populations through selective harvesting. The submodel [**fishing**](fishing) allows to investigate the relative importance of selective fishing and environmental change scenarios on population.
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See [Code](https://github.com/Ibasam/IBASAM/blob/master/IBASAM/src/Collection.cpp), lines 1008-1041.
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Fishery mortality on returning individuals was simulated by the removal of a proportion of each sea age class (1SW or MSW, base proportion of 15%) from the population at the end of summer step, that is after the observation of number of returns and proportions of MSW.
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