Oblique tube worm disease of fish

The main pathogen: oblique tube worm.

Harmful species: fry of freshwater fish.

The suitable period for control is winter and spring, from March to May, and the water temperature is 8: 18 ℃.

Identification features: there is a large amount of mucus on the body surface and Gill of the diseased fish, and the Gill tissue is destroyed. Microscopic examination can confirm the diagnosis.

Prevention and control methods: (1) 0.7 grams of cupric sulfate and ferrous sulfate mixture (5? Bet 2) the water is sprinkled all over the pool. (2) sprinkle every cubic meter of water with 20,30ml formalin solution and water in the whole pool. (3) 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 ℃. (4) wash the diseased fish with 1% salt solution or 1/50000 concentration chloroquine solution for 18 hours. (5) every 500 square meters of water is sprinkled in the whole pool with 20kg of neem branches and leaves per meter of water depth.