Control techniques of fish finger ring disease

The main pathogen: ring worm.

Harmful species: grass carp, silver carp, bighead carp, perch, mandarin fish, tilapia and so on.

The appropriate period of prevention and control: late spring and early autumn.

Recognition characteristics: the ring worm parasites on the body surface and Gill filaments of fish, destroys Gill filaments and body surface epithelial cells, stimulates the fish to secrete a large amount of mucus, and the Gill petal is puffy and gray. In the summer flower stage, the Gill cover of the diseased fish is open and the fish body is black.

Prevention and control methods: (1) every cubic meter of water is sprinkled with 90% crystal trichlorfon 0.2-0.4 grams of chemical water. (2) sprinkle 1 ~ 2 grams of trichlorfon in the whole pool with 2.5% powder per cubic meter of water. (3) every cubic meter of water was sprinkled with the mixture of 90% crystal trichlorfon and flour alkali (1 ∶ 0.6) 0.1g 0.2g of chemical water. (4) wash the diseased fish with 20 mg / L potassium permanganate solution for 20 minutes when the water temperature is 10: 20 ℃, 15 minutes when the water temperature is 20: 25 ℃, and 10 minutes when the water temperature is above 25 ℃. (5) wash the diseased fish with 20 mg / L quinine hydrochloride solution.