In the process of intensive fishery production, management of feed feeding is one of the main links in the entire production management. In the feed feeding process, the feed intake of Fish is often reduced. According to the different conditions in the production, the author states that the reasons for reducing the feed intake of farmed fish are as follows: In the first case, the fish is onset, causing the fish to feed on a reduced amount of feed. When fish diseases such as salmon endosporosis, grass carp three disease, channelfish back bleeding, enteritis, etc., the food intake of fish was significantly reduced. When the grass carp species and carp have a large number of trichomonad parasites, they will spin around in front of the feed table, affecting feeding and reducing food intake. This happens in the early stages of the disease. Once there is a reduction in food intake, attention should be paid to the fish. The fish should be immediately checked and the disease should be prevented and treated according to the specific conditions. After the fish is restored to health, the food intake can return to normal. In the second case, the water quality is poor, causing the fish to reduce the feed intake. When the dissolved oxygen in the water is insufficient, the water quality is aged, ammonia nitrogen, nitrous acid nitrogen, and hydrogen sulfide are excessively severe, and the water body is exposed to high copper pollution, it will cause the food intake of the fish to decrease. If fish eat poorly in the morning and feed well at noon and in the evening, the main reason is that the dissolved oxygen in the water body is insufficient, the water quality is aging, or ammonia nitrogen, nitrogen nitrite, and hydrogen sulfide are excessive. In response to this situation, water quality control is mainly implemented. As the old saying goes, raise a pond fish and raise a pool of water first. Water quality regulation is an important part of scientific farming. During the breeding process, attention should be paid to maintaining the fertility, liveliness, tenderness and coolness of the aquaculture water body. Fertilizer: Transparency 30 cm to 40 cm, tender green, suitable amount of planktonic plants and animals, and water can provide abundant natural food for fish. Live: The algae phase is fine, and the transparency, pH, and the cycle change periodically, and the concentrations of ammonia nitrogen, calcium, and phosphorus have regular changes. Tender: The water is green, there are many nascent phytoplankton, and there are many beneficial substances, which are good for the growth of fish. Cool: There is no oily, creamy feel, and there are few dead algae. The main methods of regulation and control are the daily opening of the aerator, the frequent addition of new water, the elevation of the water level, the promotion of the use of beneficial biological agents, and the improvement of sediment quality and water quality. During high temperatures, some old water is often replaced, preferably every 15 days. Use photosynthetic bacteria or EM bacteria once. The third situation: As a result of large-scale breeding of alginate in water, a large number of fish toxins, cytotoxins, hemolytic toxins, neurotoxins, etc., algae toxins are activated and reach a certain concentration, causing fish to reduce food intake. When the total ammonia content in the water exceeds 0.25 mg/l, Trichophyton can not become a dominant species. Therefore, regular (a small number of times) to the pool ammonia fertilizer, urea, nitrogen and phosphorus compound fertilizer, and organic fertilizer, so that the total ammonia stabilized at 0.25 mg / l ~ 1 mg / l, you can achieve preventive effect. Early in the disease fishing pond, 100 kilograms of cohesive soil was used per acre of water surface. After adding water, it was poured into mud and then sprinkled on the sick fish dense area in the four corners of the pond, and then spilled on the whole pool. A lot of water change is an effective method. The fourth situation: drug effects, caused by reduced food intake of fish. In order to prevent and treat fish diseases, the use of trichlorfon, copper sulfate, chlorpheniramine hydrochloride, and pyrethroids, etc., causes a reduction in the food intake of fish and usually has an effect of 2 days to 3 days. Should use less or no toxic drugs, can use high-efficiency and low toxicity aquatic drugs to reduce the impact of drugs on fish. After the fish is restored to health, it is necessary to change the water or detoxify the fish in time. The fifth scenario: A sudden change in temperature causes a decrease in fish food intake. When the cold air comes suddenly, the food intake of black plover and soft-shelled turtle can be reduced by one half to two thirds. In hot and hot weather, the food intake of fish decreases to varying degrees. The temperature can be adjusted to eliminate the influence, such as shade or add insulation shed. Sixth situation: In the breeding season, fish will reduce the feeding or stop eating. Therefore, the commercial fish culture process should avoid this situation as much as possible, in the breeding process of carp, the breeding season to reduce flushing to the fish pond, fertilization water quality are effective to shorten the growth of the method of growth. In the production process, effective measures can be taken flexibly according to actual conditions to reduce adverse effects. 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