Saprolegnia. The white thorn eye is restless, and often rubs the affected area on the fish tank, water plants, etc. to relieve the pain. Fish mucus increases, the muscles in the affected area rot, lack of energy, and loss of appetite. In common water, there are clusters of flocculent hyphae that fall off the fish body, which eventually leads to the death of the fish body.

Dissolve 0.7 grams of methylene blue in 100 Kilograms of water, make an aqueous solution, put the sick fish in it, bathe for 15-20 minutes, and see the mycelium fall off. Using a 15-watt UV lamp to irradiate the fish tank water for several hours a day can effectively inhibit or eliminate the breeding of water molds.