The optimum protein level of fish feed
Protein is the main nutritional index of compound feed for fish. the level of protein directly affects the internal quality of fish feed. The optimal protein requirements of different fish species and growth stages are also different. Too high protein content will not only cause a waste of feed protein resources, but also increase the pressure on pond water quality management. If the protein content is too low, it will cause slow growth and poor disease resistance of fish on the one hand, and delay production on the other hand. Therefore, mastering the optimal protein level of fish feed is of great benefit to guide fishery production.
1. Carp feed. Carp is the most common farmed fish in our province, and carp feed accounts for more than 90% of the total fish feed production in our province. The optimum protein content of feed in seedling stage, fish fry stage and adult stage is 40%-45%, 35%-40% and 30%-35%, respectively.
two。 Grass carp feed. With the promotion of grass carp immune injection technology, grass carp culture in our province is also gradually accepted by the majority of farmers. The optimum protein content of grass carp fry stage is 30%, and the optimum protein content of adult stage feed is 22%-25%.
3. Feed for blunt snout snout bream. Blunt snout bream, also known as Wuchang fish, its nutritional requirements are similar to those of grass carp. The optimum protein content of the feed in the fish fingerling stage is 25%-30%, and that in the adult stage is 22%-25%. 4. Tilapia feed. The fish is a hot water fish. Due to the short growth period, the optimum protein content for the whole growth process of the fish is 30%-31%. 5. Feed, feed, feed. The fish is a cold water fish. The optimum protein content of feed in fry stage is 45%, that in fry stage is 40%-45%, and that in adult stage is 30%-35%. 6. Spotted forktail fish back to feed. The optimum protein content of the feed in the fry stage is 35% to 40%, the optimum protein content in the fish fry stage is 30% to 35%, and the optimum protein content in the adult stage is 28% to 35%.
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Present situation and development prospect of black fish culture
People are used to calling them mullet, black fish, talent fish, raw fish and so on. Black fish is the most widely distributed and most productive species in the family Carpinidae. With the increase of market demand, blackfish is likely to become one of the most promising breeding objects in China at the beginning of the 21st century. There are 7 species of snakehead fishes in China. They are black fish, snakehead snakehead, snakehead snakehead, striped snakehead snakehead, snakehead snakehead and long snakehead snakehead. Among them, only black fish is a widespread species, which is distributed in all major river systems in China, and its yield is the largest. Snakehead snakehead, snakehead snakehead and snakehead snakehead are only distributed in China.
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4 new fish drugs with high efficiency
1. Perchlorine. This product is a fungicide, timely use of fish, shrimp, crab, soft-shelled turtle, eel, frog bleeding and red skin, printing, rotten Gill, black Gill, enteritis, decaying shell, red leg disease has a very good control effect. It has significant disinfection, sterilization and improvement effect on pond sediment and pond water. 2. Fish, insects and worms. This product is a new type of high-efficiency insecticidal drug, which can effectively kill fish parasites such as Anchorage, Chinese oysters, rotifers, ring worms, third-generation worms, sporidia, trematodes, monogonimus and other fish parasites.
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