Loach is the main aquaculture project in China, and it is also the meat that people like to eat, which has a high and special nutritional value. Generally in aquaculture, the most feared is the occurrence of various diseases and insect pests, and artificial breeding in the water environment is relatively dense, so it is easy to appear pests and diseases. When loach is farmed, the common pest is a parasitic disease, which multiplies in large quantities in the water to find the host hazard. The introduction of parasitic pests and control is the main content of this article.
1. Parasite types and harmful symptoms
1. Wheel worms
The main parasites are wheelworms, tongue cupworms, and third-generation insects. Wheelworms harm loach, appear day shift, do not eat, rarely move, appear large areas of whitishing, difficulty breathing. In severe cases, the insect body is densely covered in the gills of the loach, and finally dies, the seedlings will be restless when they are parasitized, the gills will be engorged, and the skin will rot and die.
2. Tongue cup worm
When this parasite occurs, there will be a floating head, and the cheeks can be seen to be congested, secreting a large amount of mucus, and the edges of the cheeks are red. When it is severe, it does not eat, it appears outliers, and the floating head is frequent.
3. Three generations of insects
At the beginning of the disease, it only swims frequently and has no obvious symptoms, but it appears when the disease is severe, and the loach secretes white mucus. Finally, a white mucous membrane is formed on the outside, sometimes restless, sometimes slow movement, and finally the body is thin and dies.
Second, prevention and control methods
1. Wash loach seedlings with 2% salt solution before stocking. The whole tank is then sprayed with a combination of 0.7 g of copper sulfate and ferrous sulfate. Copper sulfate is two and a half times more abundant than ferrous sulfate. Or spray with bitter leaves in decoction.
2。 Mainly wash loach seedlings with 8 ml of copper sulfate solution for 20 min before stocking. Tongue cupworm parasitism was found, and one cubic meter of water body was found with 0. 5 grams of copper sulfate and 0.2 grams of ferrous sulfate, the agent dissolved with water, sprinkled, sprayed must be comprehensive without omission.
3. Sprinkle about 120 pounds of quicklime with water in each pool for disinfection, but it still depends on the size of the pool to determine the amount of use. Then, before the first stocking, soak with dichlorvos solution for 20 to 30 minutes. After the onset of the disease, the loach is caught, soaked with 7 mg/L of crystalline dimethoate aqueous solution for half an hour, and then washed off the medicinal solution and reared alone. The whole tank is then sprayed with 0.3 mg of dichlorvos solution.
The above are several major parasites of loach infection, as well as the symptoms after infection, and the specific prevention and control methods, which can be used as a reference for everyone. However, be sure to use it flexibly according to the situation and the specific use method, as well as your own experience.