Prevention and control of the third generation of fish disease

The pathogens and epidemic fish third-generation disease are medium-sized third-generation worms, bacterial third-generation worms and beautiful third-generation insects. The disease is mainly prevalent in spring, late autumn and early winter, and the excessive density of pond culture is the main cause of fish disease.

Symptoms of the diseased fish skin has a layer of gray-white mucous membrane, thin. At the beginning of the disease, he was extremely uneasy, sometimes he swam wildly, and sometimes he swam sharply on the side. Rub in the grass or at the edge of the cylinder in an attempt to get rid of pathogens. Then he lost his appetite, swam slowly, and finally died.

First, when the water temperature is 20 ℃ ~ 30 ℃, the whole pool is sprinkled with 90% crystal trichlorfon at a concentration of 0.2 × 10 ~ (- 6) to 0.3 × 10 ~ (- 6). Second, soak with 20 × 10-6 potassium permanganate solution for 15 minutes. Third, freshwater fish are washed with 5% salt water for 5 minutes; fourth, fish bodies are washed with 200 × 10-6 to 250 × 10-6 formalin for 25 minutes or 50 × 10-6 for 14 hours.