Pathogens: many small melon insects. Symptoms: When a large number of parasitic parasites, the naked eye can be seen on the surface of the fish, fins and gills covered with white dotted cysts, it is also known as "white spot disease." Severe infection, due to invading the skin of the fish and the epidermis tissue of the larvae, causing tissue hyperplasia at the lesion site, and secrete a large amount of mucus, forming a white film covering the lesion surface, while the fin lesion lesions appear to rot. Hazardous objects and epidemic conditions: This disease has occurred in all aquaculture areas in China. The worm does not have strict selectivity for the host and it is the most serious damage to the fingerlings of the year. No matter what kind of breeding waters it can infect the disease. Prevention: 1. Before the stocking, the water depth of 1 meter per mu shall be 50 grams of "fish and insects extinguish 2B". The fish was added 0.5% to the feed and fed once every 15 days. Before stocking, the seedlings were diluted with 1/5000 of the seedlings for 3 to 5 minutes. 2, when the disease occurs with 50 grams of "fish and insects killed 2B" 2000 times the water dissolved after the water level of 1 meter per acre of water the whole pool evenly spilled, once again every 2 days. At the same time with the "fish recreation 2" better use. If the lesion is severely infected, use "Yukang Le No. 1" to add 1.5% to the feed and continue feeding for 3 to 5 days.
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