Control methods of parasitic diseases of ricefield eel

Monopterus Albus has a very high probability of parasitic diseases, which is more likely to occur in high temperature season. Although the sick ricefield eel has less death, the growth rate will be greatly affected, which will seriously affect the economic benefits of farmers. Here, some prevention and control methods of parasitic diseases are introduced to farmers.

Acanthosis

[symptoms] the diseased eel has a severe loss of appetite, or does not eat, turns blue and black, and its anus is red and swollen. The worm penetrates into the intestinal mucosa with the snout, absorbs nutrients, causes inflammation of the intestinal wall, and in severe cases can cause intestinal blockage or intestinal perforation, resulting in the death of ricefield eel, with an incidence of about 90%.

[prevention and treatment] ① was thoroughly disinfected with quicklime or drained before the eel was released, and the intermediate host was killed by exposure to the sun for a long time. ② every 1 kg feed plus eel net 5 8 grams, mix and feed, once a day, 7-10 days in the onset season. ③ every 100kg Monopterus Albus was fed with 10 grams of 90% crystal trichlorfon mixed with earthworm or mussel meat for 6 days. At the same time, the whole pool was sprinkled with crystal trichlorfon, and the concentration of pool water was (0.3 × 0.5) × 10 ~ 6. ④ was fed with 1.5% Yuchongqing No. 1 mixed bait for 3 days as a course of treatment. ⑤ was fed with 0.2g mebendazole and 0.3g levamisole every 100kg of Monopterus Albus, and the same method was used every 2 days. ⑥ was bathed in 2 mg / L "Baichongg" solution for 5 minutes, and then added to the feed with "Fish and insect killing" No. 1 with 4% addition for one day. Feed the bait for 2 to 3 times and stop eating for 1 day before taking the medicine. If ⑦ is complicated with enteritis, it should be fed combined with antibiotics.

Capillary nematode disease

[symptoms] the diseased eel has a loss of appetite and emaciation, often sticking its head out of the water and rolling its abdomen upward or in a struggle. The incidence of capillary nematode disease of Monopterus Albus is in the peak season from June to September every year. The incidence of capillary nematode disease is mostly in soil eel ponds cultivated in high-density static water, but less in cement ponds or brick eel ponds cultured in running water. The incidence is about 80%.

[prevention and control] dry ponds of ① in winter, expose the bottom and walls of the ponds, clean the ponds thoroughly with 200g quicklime per cubic meter of eel ponds before the eel species are released, in order to kill the pathogen of the original ponds. During the epidemic season of ②, the whole pool was sprinkled with 0.3mg / L crystal trichlorfon, once or twice a month. ③ was fed 0.2 to 0.3 grams of levamisole or mebendazole per 100kg of ricefield eel for 3 days. ④ every 100kg of ricefield eel was fed with 90% crystal trichlorfon 10 grams and 15 grams of feed evenly for 5 days. ⑤ bathed the diseased eel with 2 mg / L Chongg solution for 5 minutes, and added it to the feed with 4% addition of Yu Chong Min 1. The bait was given for 1 day, divided into 2 to 3 times, and stopped eating for 1 day before taking the medicine. ⑥ soaked veterinary trichlorfon tablets (0.5g / tablet) in water and crushed them into 0.1% of the mixed feed for 6 days.

Bdellosis

[disease] Leech parasites near the head of Monopterus Albus and both sides of the fish to absorb the blood of Monopterus Albus as nutrition. The epidermis of diseased eel is damaged, which causes bacterial infection, slows the activity of diseased eel, decreases appetite, affects growth and kills in severe cases.

[control] ① should pay attention to do not bring insect source when entering water or when transplanting aquatic plants such as water hyacinth. ② was sprinkled with 0.5 × 10 ~ 6 crystal trichlorfon in the whole pool. on the second day, part of the pool water was replaced again according to the original dosage, and on the third day, the pool water was replaced thoroughly. ③ washed the sick eel for 5 minutes with 3% saline or 10ppm copper sulfate solution for 10 minutes.

④ soaked the diseased eel with 5 mg / L potassium permanganate solution for half an hour, which had better therapeutic effect.