Fish rotifer
The main pathogen: rotifer.
Harmful species: all kinds of marine and freshwater fish.
The appropriate period of control: it occurs all the year round, and it is common from May to August.
Identification features: fish body tissue secretes a lot of mucus, Gill tissue rot, diseased fish body color is black.
Prevention and control methods: (1) every cubic meter of water is sprinkled with 0.7g copper sulfate and ferrous sulfate (5 ∶ 2) mixed water. (2) diseased fish can be washed with 2% salt solution for more than 15 minutes, or with 8 mg / L copper sulfate solution for 20 minutes, once every 2 days. (3) every 500 square meters of water (1 meter deep), sprinkle with 15 kilograms of neem branches and leaves boiled juice, or soak the neem branches and leaves in the pond and replace them every 7 to 10 days. (4) for every 500 square meters of water (1 meter deep), mash 2.5 to 3.5 kilograms of fresh leek, mix well with 65 grams of salt and sprinkle in the pool.
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