The ringworm disease is a common and frequently occurring disease, mainly parasitic on grass carp, carp, carp, carp, tilapia and other sepals, and a few parasitic on the skin and fins of grass carp. It mainly depends on eggs and larvae. The suitable temperature for growth is 20-35°C, which is one of the common diseases in the culture stage of cultured fish. In late spring and early summer, the disease is more prevalent. In combination with the current climate and environment, Nova Aquatics provides several very practical tips to share with the farmers. 1. Disinfect with clear lime pond to prevent eggs and larvae from entering the water inlet. 2. Fish species should be bathed with 20ppm potassium permanganate solution for 20 minutes prior to stocking to kill the parasitoid 3 on the fingerlings, and use the crystal trichlorfon (content 90%) to treat the ringworm with an amount of 200-350g/kg. Mu, there is a certain effect, but must be repeated once after 7 days, otherwise it will recur. It is worth noting: 1. The prevention and treatment of ringworm disease should be based on prevention. The disinfection of water bodies should be strengthened. 2, if the long-term use of trichlorfon to control ringworm disease, may make the ring insect resistance. If this happens, consider choosing alternative insecticides for replacement.