Aquatic feed additive feed protein powder, compound feed based on aquatic animal nutrition physiology characteristic, according to the aquatic animal nutritional need of different growth stages, the energy feed, protein feed, minerals and other nutrients in proportion to cooperate, by fish feed machinery processing, made of nutrients, good palatability of finished feed. Classified by fishing with compound feed nutrition, can be divided into three types: full fish feed, also called fishing completely with the feed or "balanced fish feed", refers to the fishery feed nutrition comprehensive, reasonable proportion, can meet the nutrient requirements of the aquatic animals of different growth stages of compound feed. Fish feed additives, nutritional supplement fish feed, the main complement fish feed the content of some trace elements and constant elements. Fish feed premix, also called premix, used for trace elements (or constant) and some fish feed premix, the premixed feed and then made into finished products together with other fish feed feed.