ABSTRACT
Primary processing of fish generates fish processing coproducts and by-products. The use in the common language of the term "waste" to designate fish coproducts and/or by-products is inappropriate because it implies that the material resulting from fish processing cannot be used for any other application and should be disposed of. Fish coproducts include products intended for human consumption, such as liver, whereas fish by-products consist of parts that are not meant to be valued as human food, although they retain some valuable components. Enzymatic hydrolysis represents increasingly used method for protein recovery from fish coproducts. The by-catch is the catch of nontarget fish and ocean wildlife, including both what is brought to port and what is discarded at sea. A domain where fish by-catch and by-products gained more interest is the enzymes industry. Along with the by-catch reducing programs, making it more profitable would contribute to reducing discards of unavoidable by-catch, low-value fish, and by-products.
