Grass carp anorexia refers to the phenomenon that the grass carp is not prosperous due to parasites, environment, weather, and bait. It occurs most frequently in early spring, especially from March to May each year, causing some impact on aquaculture.
Based on years of experience, environmental factors are the leading cause of anorexia in early spring grass carp. At this time, the season alternates, with large temperature difference between morning and evening, stress caused by sudden changes in the weather, and frequent up-and-down convection in the water layer. In the case of a gradual increase in temperature, deposition of a winter reservoir sediment and fish fecal baits began to accelerate the decomposition and release of harmful hydrogen sulfide, nitrogenous waste (such as ammonia nitrogen), while consuming water oxygen, reducing water The pH value, resulting in a significant reduction in oxygen supply capacity and oxygen supply, affects the feeding of grass carp. Secondly, in the early spring from March to May, it is the time of the occurrence of the anchored head, Chinese sturgeon, trichoderma, and ringworm, and parasitism of a large number of parasites also causes grass carp to be anorectic.
Third, in some areas where intensive culture is not high, many farmers often intensify their doses of pesticides during the first insecticides in spring, resulting in fish neurotoxicity and a decline in feeding. Fourth, some feeds or raw materials in the early spring may be degraded due to long storage time, and they may also cause fish anorexia. In addition, there are some reasons, such as insufficient water body fertilizer, excessive nitrogen fertilizer application, shallow ponds, and low alkalinity hardness of water, which can also lead to grass carp anorexia.
For the early prevention of grass carp anorexia, clear lime ponds or suntans can be cleaned with lime or bleach to help reduce harmful substances in the pond bottoms. Early in the spring before and after the Ching Ming Festival with benephrine net, abamectin to kill Chinese sturgeon, anchor head clams and other crustacean parasites, preferably used twice a week, killing more completely. For the high-level trichomonads and ringworms at this stage, insects can be eliminated in advance, and the insecticide safety of traditional Chinese medicines is effective.
The anorexia of grass carp caused by trichoderma can be killed on the first day with the use of insecticides and copper sulfate, which can both kill insects and sterilize, and can also reduce the probability of occurrence of later-day fish red-skin disease. Detoxify with a mild hydrolytic agent to enhance the transparency of water and promote the reproduction of high-quality algae. For ponds with high forage feed and large amounts of fecal baits, we can use the bottom poison to decompose the organic waste in the sediment in the morning, and use the stress Jieduling to detoxify in the afternoon; on the second day, we use the active and high-efficient decomposition of organic matter. Cool + cool water to adjust the color. For organophosphate insecticide poisoning, it can be detoxified with a mild hydrolytic agent and stress detoxification agent can be used for pyrethroids or other insecticide poisoning. Can also be combined with the application of green source peptide + water, not only to play algae fertilizer effect, but also adjust the water color, keep the water refreshing.
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