Some fisheries such as the great lakes in north america and lake victoria in africa support a commercial harvest that is exported and marketed away from the source. Other fisheries produce large quantities of fish but most or all of the catch is consumed locally so the economic importance is harder to measure.Example of the latter include tha amazon and its tributaries in south america the chang jiang yangtze river in china the tonle sao river in cambodia and the mekong river in vintenam.
Steel head trout are one of the important cold water fish species in lake michigan.Lake michigan steelheads are wild hybirds.Fish from the amazon also is an important export to asian countries especially japan...
World wide all fisheries are threatened by various factors.Pollution loss of habitant invasive species parasites illegal fishing methods depleted wild stock and over fishing are some of the more serious threats.
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