How to prevent and cure common intestinal diseases in fish

Viral intestinal diseases, enteritis. Harm object: grass carp, herring. Symptoms: the diseased fish have black body color, red and swollen anus, hyperemia at the base of the fin adjustment, erythema in the abdomen, intestinal inflammation, red or purplish red. Control method: before stocking ① fish, soak it with 10ppm bleach. During the ② epidemic season, the whole pool was sprinkled with 1ppm bleach every half a month, or sulfonamide interdrug bait was given. ③ garlic treatment. Garlic is 250 grams per 250 kg of fish seed and mixed with bait for 3-6 days.

2. Parasitic intestinal diseases 1. Coccidiosis. Pathogen: Eimeria. Harm object: herring. Symptoms: the Gill is pale, the inner wall of the intestine forms many gray-white "tumors", and the tissue around the focus fester, producing white pus. Prevention and control method: ① immortal lime thoroughly clean the pond. ② was given iodine bait. Use 30 milliliters of 4% iodine for every 250 kg of herring for 4 days. ③ was fed with sulfur powder bait. Use 50 grams of herring for every 250 kilograms. two。 Myxosporidiosis. Pathogen: Myxosporidium. Harm object: carp, crucian carp. Symptoms: White dot cysts are formed on the intestinal mucosa. Carp and crucian carp above Ⅱ age can also pass through the intestinal wall and appear a large number of cysts in the outer wall of the intestine. Prevention and treatment: ① will fish out the diseased fish in time, and the diseased fish should be buried deeply after death. ② strictly cleans the pond, and fishing gear and bait equipment should be disinfected frequently. Before stocking, ③ fingerlings were washed with 500ppm potassium permanganate solution or 500ppm lime nitrogen solution for 30 minutes. 3. The pathogen of paragonimiasis: paragonimus japonicus. Harm object: herring, carp, crucian carp. Symptoms: the diseased fish are blackened, swim slowly and float in flocks on the leeward water. Fish fry or summer flower fish can die in large numbers 3-5 days after the disease. Control method: ① cleans the pond thoroughly and kills the snail master. ② breeding and summer flower fry should not be eaten with fish raised as adults in previous years. 4. The pathogen of taeniasis: Taenia solium in Jiujiang. Harm object: grass carp, herring, silver carp and other fish weight in the year. Symptoms: sick fish increasingly thin, do not eat, the mouth is often open, the back of the foreintestine turn, there are many thin noodle-like white worms, can cause a large number of fish species death. Prevention and cure method: clean the pond with quicklime or bleach powder for ①. ② dead fish buried away from the pond. ③ was given trichlorfon bait. Mix 50 grams of 90% trichlorfon crystal with 500 grams of flour for 3-6 days. Stop eating for one day before giving the medicine. ④ is given pumpkin seed bait. Grind 250 grams of pumpkin seeds into powder, then mix well with 500 grams of flour and 500 grams of rice bran for 3 days. 5. The pathogen of tongue tapeworm: tongue tapeworm. Harmful objects: common carp, crucian carp, silver carp, bighead carp, grass. Symptoms: the sick fish have a big belly and a thin back, gently press with their hands, and have a hard feeling. Prevention and cure method: ① dry the bottom of the pond in spring and clean the pond with quicklime. ② kills European birds and cuts off the development process. 6. Capillary nematode pathogen: capillary nematode. The harm to a wide range of objects. Symptoms: it does great harm to summer flower fish species, which can cause loss of appetite, weight loss and gradual death. Prevention and cure method: ① cleans the pond with quicklime. ② was fed with crystal trichlorfon bait. Put 90% crystal trichlorfon into the bait for 6 days according to 250 kg of fish seed medicine 5 g-7 g.