【Pathogen or etiology】
The pathogen is Chinese loach.
【Clinical Symptoms】
Greater Chinese gills tend to parasitize on grass and bluefish gills over 2 years old, and Silver carp parasitizes on gills and bighead carp over 1 year old. There are no obvious symptoms in a small number of infections, and in severe infection, the gills of the sick fish are pale, the mucus is secreted abnormally, and a large number of white maggot-like bodies can be seen at the end of the gills. Sick fish have a decreased appetite or do not feed, whirl or swim wildly on the surface of the water body, and the tail fin is upturned, commonly known as "tail warping disease". The occurrence of gill rot disease in autumn such as silver carp and grass carp is highly correlated with the parasitism of Chinese fleas.
Fig. 1 Microscopic picture of Chinese flea - two egg sacs hanging behind the body
Fig. 2 Parasitic diagram of the Gill part of the Chinese flea
【Prevention and control measures】
(1) Clear the pond with 250-300 kg of quicklime belt water per mu to kill parasite larvae and intermediate hosts.
(2) In the epidemic season, you can use the fishing enemy insect hanging bag at the bait station for three consecutive days, which has a better effect on the prevention of Chinese fleas.
Treatment:
(1) On a sunny day in the morning, use 90% crystal dimeter 0.7-1ppm concentration with water and sprinkle the whole pool, once a day, for 2d.
(2) Use 4.5% cypermethrin solution 0.2-0.3PPM whole tank in the morning of a sunny day, and use it twice in severe cases.
【Source: Municipal Bureau of Agriculture and Rural Affairs】
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