Fish, Whales, Crustaceans, Mollusks

Fish and fish products fulfill an important role in human nutrition as a source of biologically valuable proteins, fats and fat-soluble vitamins. Fish can he categorized in many different ways, e. g., according to  

Commercial fishing takes place in the open sea, coastal and freshwater areas. Conservation programs and hatcheries to rebuild stocks play important roles in the management of fresh and saltwater fish resources. 

BeUtz W. Grosch P. Schieberle, Food Chemistry Springer 2009 

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