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The optimum protein level of fish
Protein is the main nutrient index of compound feed for fish. The level of protein directly affects the intrinsic quality of fish material. Different types of fish have different stages of growth and their optimal protein requirements are also different. Excessive protein content will not only result in a waste of feed protein resources, but also increase the pressure on pond water quality management. If the protein content is too low, on the one hand it will cause slow growth of fish and poor resistance to disease. On the other hand, it will delay the timing of production. Therefore, it is of great benefit to guide the fishery production to understand the optimal protein level of fish feed. 1, carp feed. Salmon is the most common farmed fish. The optimal protein content for the seed stage feed is 40%-45%, the optimum protein content for the fish stage feed is 35%-40%, and the optimum protein content for the adult stage feed is 30%-35%. 2, grass fish feed. With the promotion of grass carp immunization technology, grass carp culture has been extensively bred by farmers in our province. Grass carp feed accounts for more than 40% of fish production in our province. The optimum protein content of grass carp fish is 30%, and the optimum protein content of adult fish is 22%-25%. 3, group head feed. The head of a fish is also known as Wuchang fish, and its nutritional needs are similar to that of grass carp. The optimum protein content of the feed for the fingerling stage is 25%-30%, and the optimum protein content of the feed for the adult stage is 22%-25%. 4, tilapia feed. The fish is a hot water fish. Due to its short growing period, the optimum protein content of the whole growth feed is 30%-31%. 5, rainbow trout feed. The fish is cold water fish. The optimum protein content of the fry stage feed is 45%, the optimum protein content of the fish stage feed is 40%-45%, and the optimum protein content of the adult stage feed is 30%-35%. 6, catfish feed. The optimal protein content of fry stage feed is 35%-40%, the optimum protein content of fish stage feed is 30%-35%, and the optimum protein content of adult stage feed is 28%-35%.