Fish farming in spring should be alert to immediate results and parasitic diseases.

Spring is the season of high incidence of foot disease and parasitic diseases. Vertical scale disease mainly h

Fish farming in spring should be alert to immediate results and parasitic diseases.

Spring is the season of high incidence of foot disease and parasitic diseases. Vertical scale disease mainly harms carp and crucian carp, and other freshwater fish such as grass carp and bream are sometimes infected with the disease. The scales of diseased fish with vertical scale disease stand up and the body surface is rough. If you press the scale slightly, the liquid will be ejected from the scale and the scale will fall off. Parasitic diseases mainly mean that fish will carry some parasites during wintering. When the water temperature rises, parasitic diseases will easily break out, causing great losses and seriously affecting the growth of surviving individuals in the later period.

In order to prevent the vertical ruler disease, the following preventive measures should be taken: disinfect the pond, dig out excess sludge when cleaning the pond, and disinfect the pond with quicklime or bleaching powder. Pour disinfectant (such as bromochlorothalonil) into the whole pool according to the conventional dosage to keep the drug concentration in the pool water between 0.5 and 0.6 ppm. Be careful when operating. In the process of fishing, counting, handling and stocking, try not to hurt the fish. Fish in medicated bath can be administered with 2%~3% salt solution for 4 minutes ~ 10 minutes before stocking. During the onset season, the whole pond should be sprayed with liquor and water solution of quicklime twice as much as1~ every month to keep the ph value of the pond water at around 8. Injecting fresh water at the beginning of the disease can alleviate the condition. Timely administration, the parent fish can be injected with streptomycin sulfate intraperitoneally or intramuscularly, with the dosage of 200,000 units per kilogram of fish, or take oxytetracycline orally, and oxytetracycline is added to each kilogram of feed for 3-6 days.

Effective control measures for fish parasitic diseases are as follows:

Length improves the fish's self-resistance. Fish consume a lot of energy in winter. When the water temperature rises in spring, fish should choose a better compound feed when they start eating. At the same time, regulators such as "immune activity growth promoter" and "fish feed is good" can be added to the feed regularly, so that the fish's physique can be quickly restored and the fish's resistance to exotic parasites and other pathogenic organisms can be improved.

2. Improve the water environment. During the winter, the pond rarely changes water, and the metabolic wastes of various aquatic organisms accumulate in the water. After the water temperature rises in spring, these metabolic wastes decompose rapidly, consuming a lot of dissolved oxygen in the water. Therefore, in addition to properly changing water in spring, it is necessary to maintain high dissolved oxygen and a good water quality environment, and regularly use water quality improvers and disinfectants to prevent the accumulation of metabolic wastes and effectively improve the water environment for fish to survive.

3. Kill parasites carried by fish in time. During the breeding period of parasites in spring, some safe, efficient and pollution-free drugs can be selected in the market, such as "Fish and Insects Kill Stars" and "King of Insect Control" series drugs. To completely kill the parasites carried by overwintering fish.

4. Treatment and drugs. After the outbreak of fish parasitic diseases, although there are many treatment measures, the cultured products must meet the quality standards of pollution-free green food, so we must be careful in the choice of drugs. The recommended safe insecticide is Yumalin, which can treat parasitic diseases such as cucurbitaceae, Trichinella spiralis and rotifer, and has antibacterial and disinfection effects. It is an efficient and pollution-free drug for treating parasitic diseases and can be safely used in green aquaculture. Fish insecticidal star is a compound preparation for preventing and treating fish parasitic diseases. It is mainly used to treat fish diseases caused by rotifers, giant salamander, gourd fish, mackerel, anchovy, centipede and other parasites. It has the advantages of less dosage, quick response, no pollution to water body and no toxic and side effects to fish. Widely used in all kinds of marine freshwater fish, including eel, mandarin fish, mandarin fish, perch and other famous aquatic products that are very sensitive to trichlorfon and other organophosphorus drugs, and can be safely used for green culture. Chinese herbal pesticides, such as neem bark, laurel, betel nut, etc. You can soak in fruit juice, splash with wine, or use preparations such as "fish feed is good" to prevent the invasion of parasites safely and effectively.