Control of rotifer in cultured Pelteobagrus fulvidraco

[etiology] the pathogens were Trichodina and Trichodinella. It spreads or leaves the fish by direct contact and swims freely in the water to transfer the host.

[symptoms] pathogens are mainly parasitic on the gills, skin and fins of Pelteobagrus fulvidraco. When a small amount of parasitism, the feeding and activity of Pelteobagrus fulvidraco are normal, and a large number of parasites can easily lead to Gill, skin mucus hyperplasia, Gill filament congestion, small bleeding spots on the body surface, loss of appetite, and the fish are concentrated in the lower reaches of the bait table when feeding. The color of the fish is deepened, and the weight loss of the fish is preferred to the friction at the edge or bottom of the pool. It doesn't usually lead to death.

[epidemic and harm] April to July is the main epidemic season of the disease, and the suitable breeding temperature of rotifer is 20-28 degrees. The main harm objects of the disease are fish fry and fish species. When the water quality deteriorates and the culture density is too high, it is easy to get sick and epidemic, which can cause the death of a large number of fish.

[diagnosis] scraping the body surface and fin of Pelteobagrus fulvidraco or taking Gill to make water seal film, microscope observation found that a large number of rotifers can be diagnosed.

[prevention] ① stocking to clear ponds and maintain good water quality. Choose a reasonable stocking density. ② fingerling was soaked in 3% salt water for 5 minutes before stocking.

[treatment] the disease can be effectively prevented and treated with 0.5 mg / L copper sulfate and 0.2 mg / 1 ferrous sulfate mixture in the whole pool, once every 3 days, for 3 times.