Fish myxosporidiosis

The main pathogen: Myxosporidium.

Harmful species: carp, crucian carp and other fish.

The suitable period for prevention and control is from May to September.

Recognition characteristics: there are many kinds of myxosporidium, the parasitic sites are very extensive, and the symptoms and harm caused by myxosporidium are different. Iodosporidium pancake parasitized in the intestinal wall of grass carp and carp muscle to form white cysts; silver carp iodosporidium parasitized in the neurosensory organs of fish, causing fish to swim rapidly, commonly known as madness; myxozoa parasitic in the kidney, spleen, liver, swim bladder, digestive tract and other places, causing the fish abdomen dilated and out of balance; Jitao monopole parasitic in the fish intestinal wall, forming large cysts, blocking the intestines The monopole of mud carp parasites under the fish scales and forms oval scale-like flat cysts, which often make the fish scales stand up.

Control methods: (1) washing fish with 5 mg / L chloroquine phosphate solution can kill myxosporidia and prevent silver carp iodosporidium. (2) the whole pool should be sprinkled with 0.5 grams of crystal trichlorfon per cubic meter of water. (3) the whole pond was sprinkled with 1.5 grams of methylene blue per cubic meter of water to treat unipolar disease. (4) each kilogram of fish was fed with levamisole 4mg / kg for 20 days. (5) 20-40 grams of betel nut per kilogram of fish should be fed once a day for 15 days. (6) take cyclic chloroguanidine hydrochloride with 0.2 grams per ten thousand fish fry, dissolve in a small amount of water, then mix in the feed, and start feeding on the third day after the fry goes down the pond for 7 days as a course of treatment; when the fry grows to 3.2cm, use another course of treatment, the dosage is 0.3-0.4 grams per ten thousand fry per day. At the time of onset, the dosage of 3-4 cm fry was increased to 1.5-2 grams per 10,000 fish fry for 7-8 days.