The shallow water fish have only 8 percent of the fitness of deep-sea fishing.

Cod fishing is of highest intensity in shallow water in Iceland and selects against genotypes of cod adapted to shallow water. The PLoS ONE paper reports a significant difference in the adjusted Darwinian fitness between shallow-water and deep-sea cod. The shallow water fish have only 8 percent of the fitness of deep-sea fishing. This difference can lead to rapid elimination of shallow-water fish in just a few generations with drastic effects on the population and the fishery.

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