Correct use of fishery medicine

With the rapid development of aquaculture, the problem of disease prevention and control has become increasingly prominent, so it is particularly important to master the correct use of fishery drugs.

First, fish medicine under the symptom

① poisoning, including pesticide poisoning, red tide poisoning, seaweed poisoning, fishery drug poisoning, etc., different poisoning conditions, different treatment methods. ② malnutrition, chronic, long-span, should choose high-quality feed, should not be misdiagnosed as other diseases. ③ bacterial disease has the same symptoms as bacterial disease, and most antibiotics are effective. There is almost no effective treatment for ④ virus disease, which focuses on prevention. There are many kinds of bacterial diseases in ⑤, which is the main object of prevention and control of aquatic diseases. It should be disinfected in time, eliminate pathogens and properly deal with sick and dead fish. The protozoa of different pathogens of ⑥ were treated with different drugs. Special drugs such as insect king, vermicidal king and insecticidal pioneer can be selected for the treatment of clonorchiasis with ⑦. ⑧ mycosis, including Gill mold and water mold, is caused by the deterioration of water quality, and the regulation of water quality is the key.

The dynamics of fish population should be paid close attention to within 13 hours after the application of fish medicine, and timely measures should be taken to prepare for drainage and injection of new water. After the second day, the pond was patrolled once in the morning and evening, and the illness and death were recorded.

Second, the use of fishery medicine

① method is used to calculate the dosage of drugs sprinkled evenly in the whole pool, which is suitable for prevention and treatment, and is not affected by appetite, but it is not suitable for drugs with high price and long half-life. Irregular fish ponds have the advantages of inaccurate dosage, poor safety, great side effects and easy to destroy the water body. ② feeding method is used to estimate the amount of feed and drug used to make bait, which can play an absorptive role after drying. It is suitable for the prevention and early treatment of diseases such as viruses, bacteria, parasites and nutritional imbalance, especially for organ diseases and killing parasites. However, it belongs to passive drug administration and depends on active feeding, which is not effective for fish that are seriously ill and stop feeding. ③ hanging bag method, said to choose a hanging place for medicine bagging, add medicine regularly for prevention or use on the larger water surface, but the curative effect is not as good as sprinkling in the whole pool, affecting food intake. ④ immersion method, the preparation of fish medicine into the appropriate container, and then put the fish into the liquid, to achieve efficacy after release. The drug dosage is small, the drug cost is saved, the efficacy is not affected by the water environment, does not pollute the water body, and is suitable for precious and large fish, but rough operation is easy to damage the fish body, and it is not convenient when the fish body is small and the quantity is large. ⑤ smear method, the fish head upward to prevent drugs from flowing into the gills, small dosage, convenient and safe, less side effects, suitable for parent fish care, trauma and local inflammation treatment, but can not use a large number of drugs. ⑥ injection was divided into intramuscular injection (injection along the base of the dorsal fin and the fish body in the direction of 30-40 degrees toward the head) and intraperitoneal injection (the needle was injected oblique to the pectoral fin along the inner base of the ventral fin, depending on the size of the fish). The dosage is accurate, the absorption is fast and complete, and the curative effect is good, but it is too troublesome. It is only used when the parent fish is induced to give birth, the vaccine is artificially injected, the number of diseased fish is small, and the variety is expensive.

Matters needing attention

When ① buys fishery medicine, pay attention to check the approval number, production batch number, validity period, drug withdrawal period, storage method, packaging quantity, etc., especially do not buy the wrong fishery medicine because of too many names. The efficacy of ② fishery medicine in water is affected by many factors, so it is necessary to adjust the dosage or replace it according to the situation. ③ forbids fishery drugs, pentachlorophenol sodium, malachite green, chlordimeform, amitraz, lindane, toxaphene, methyltestosterone, diethylstilbestrol, potassium antimony tartrate, quinolinol, methamidophos, methyl parathion, dichlorvos and BHC.