Fish farming is the principal from of aquaculture while other methods any may fall under Mari culture. It involves raising fish commercially in tanks or enclosures usually for food. Fish species continents raised by fish farms include Atlantic, salmon,crap,tilapia,catfish,trout and others. Increase demands on wild alternative solution to the increase market demand for fish and fish protein.
Economic importance of fresh water fisheries:
Some fisheries such as the great lakes in North America and lake Victoria in Africa support a commercial harvest that is exposed 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 measure. Examples of the latter include the Amazon and its tributaries in South America the Chang Jiang (Yangtze River) in China the tonle Sap River in Cambodia and the Mekong River in Vietnam.
Steelhead trout are one of the important cold water fish species in Lake Michigan. Lake Michigan steelheads are wild hybrids. Fish from the Amazon also is an important export to Asian countries especially Japan .
Threats to fresh water fisheries:
Worldwide all fisheries are threatened by various factors. Pollution loss of habitat invasive species parasites illegal fishing methods depleted wild and over fishing are some of the more serious threats.
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