Diagnosis and treatment of fish parasitic diseases

1. Sporozoa is a kind of parasite with the most species, wide distribution and great harm in aquatic animals. at present, the more serious hazards are coccidiosis, crucian carp iodine bubble disease, round iodine bubble disease, cake iodine bubble disease, crucian carp myxosis, Chinese myxosis and so on. A large number of parasitic sporozoa in fish cause symptoms such as weight loss, loss of appetite, blackening of body surface, abdominal enlargement and so on.

Prevention and control methods 1. Excessive silt at the bottom of the pond must be removed and the pond must be cleaned with quicklime or chlorine-containing disinfectant to kill hibernating spores. two。 When choosing and buying seedlings, prevent them from bringing into the source of infection. The seedlings were bathed with povidone iodine for 15 ~ 20 minutes before entering the pond. 3. Feed high-quality bait to enhance the disease resistance of the fish. When sporidia are found to be parasitic, 1.5% "sporidium" is added to the feed for 3 days, and on the 4th day, it is sprinkled in the whole pond with "fish and insect pests".

Second, taeniasis harms many kinds of tapeworms in fish, mainly Taenia solium, Taenia solium and so on. The tapeworm mainly lives in the intestines of grass, silver carp, carp, crucian carp and carp, which makes the diseased fish lose weight, blacken the body color, travel alone and so on. When the tongue tapeworm parasites the fish, the diseased fish's abdomen is dilated, out of balance, swimming sideways or abdomen upward, dissection shows that the body cavity is full of banded worms, the internal organs are squeezed to produce deformation and atrophy, and the diseased fish will also lose commercial value because of their thin belly and large belly.

Prevention and control methods 1. Clear the pond thoroughly with quicklime before stocking to kill adults and eggs in the water. two。 Add 200 ~ 280 grams of "fish and insect quick kill" to every 100 kg feed to make bait for 3 days. 3. Five to seven days after feeding bait, 0.6 × 10 ~ (- 6) "killing hydantoin" or "Baiduqing" was sprinkled in the whole pool to prevent secondary bacterial infection. 4. Grind 250 grams of pumpkin seeds into powder for every ten thousand fish, mix well and feed in 0.5 kilograms of wheat bran for 3 days.

Third, oblique tube disease mainly attacks the gills and skin of fish, with its mucus as nutrition. When the fish is parasitized by oblique tube worms, the gills and skin are destroyed and a large amount of mucus is secreted, resulting in dyspnea, thin and black fish, slow swimming, and then die. The water temperature of 5 ℃ ~ 18 ℃ is the epidemic season of the disease, which harms many kinds of freshwater fish.

Prevention and control methods 1. Thoroughly clean and disinfect the pond with chlorine-containing preparations to kill pathogens. two。 Before entering the pond, the fish should be washed for 20 minutes with 8 mg / L copper sulfate or 2% salt solution. 3. The diseased fish were washed with 8 × 10-6 copper sulfate solution for 30 minutes and sprinkled with the mixture of 0.7 × 10-6 copper sulfate and ferrous sulfate (5 ∶ 2).

Fourth, the anchor head "sick anchor head" is a large parasite, visible to the naked eye, mainly parasitic on the gills and epidermis of many kinds of freshwater fish, sucking nutrient solution, so that the parasitic parts are red, swollen and inflamed, appear red spots, and are easy to be attached by water molds or infected with other bacteria. The sick fish are anxious, their food intake is reduced, and they gradually lose weight and die. The disease of anchor head is serious and harmful in recent years.

Prevention and control methods 1. The fish pond is thoroughly cleared with quicklime. two。 The infected fish ponds were sprinkled with the mixture of copper sulfate and ferrous sulfate (5 ∶ 2). 3. At the time of onset, the fish were washed with (10-30) × 10-6 potassium permanganate for more than 1 hour. 4. Each mu of pine branches and leaves 10 kg ~ 12 kg, tied into 5 ~ 6 bundles, inserted and hung around the food field, or mashed, soaked and sprinkled in the whole pool. 5. Putting fertilizer or flushing into fresh water to change the water quality can also make the worm fall off, which has a certain curative effect.