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Habitat Hawthorn is a morphopod, a genus, and a genus, commonly known as Wudaohe. It is named because of its five wide stripes that span across the body. Hemoxius inhabits deep water areas with low turbidity and distribution of aquatic plants. The suitable water temperature for growth is 0-35°C, and the optimal water temperature for growth is 15-25°C. In pond culture, they prefer to live in a calm water environment where sand or mud is not turbid, and they are active in the middle and lower water layers. The dissolved oxygen requirement of water is above 1.5 mg/l. The fish is ferocious and mainly eats meat. The larvae feed on zooplankton. When the body is more than 10 centimeters long, other small fish often feed on the food. When the feed is insufficient, there will be fratricidal phenomena.
The pool condition is 4 meters deep, with a flat bottom, less silt, good water retention, and easy drainage and drainage. Drain outlets are larger than regular ponds to facilitate timely drainage and cooling. One well is equipped with a 3-kilowatt aerator and a 20-cm submersible pump per pool.
Technical Measures (1) Preparation. In the 15 days before stocking, ie, in early May, dry lime ponds are used to clear the pond, and every 667 square meters of lime mud is used to sprinkling 60 kilograms of slurry. After 6 to 7 days in the clear pond, fresh water is added to a depth of 1 meter, and 400 kg of fermented chicken manure is piled every 667 square meters for fertilizer and water. At the same time, some water peanuts and water hyacinths are planted around the pond. (2) Feeding of bait. In the first year of the breeding period, the wild fish purchased was chopped into meat paste, which was divided into 8 points and stacked around the pool, and fed 3 times a day. After 1 month of domestication, they were finally fed on the bait station. In the second and final years of the first year of breeding, wild fish purchased from the market are fed. Before feeding, first wash the bait fish with water, then soak for 15-20 minutes with potassium permanganate solution having a concentration of 20 mg/l, or soak with salt solution with 5% water for 5 to 10 minutes, and then feed. Fish minced and fed. With the growth of the river eel, the food can be directly fed, and the amount of each feed is within 1 hour of the fish. The amount of the feed is 2% of the body weight of the eel. Have patience when feeding, and when the bait is eaten, throw it again until the fish are no longer fighting for food. Feeding in the morning and in the afternoon should be based on the fish’s feeding, activity, and weather conditions. (3) Water temperature regulation. Hemorrhoids are cold and temperate fish, the key to the success of breeding is the water temperature. In the early stage of cultivation, fresh water is added once a week, and water is added at 20 to 25 centimeters each time. During the high temperature season, the pond water level is maintained at more than 3.5 meters, and water is added for about 6 hours per day so that the water can circulate to reduce the water temperature, so that the water temperature can be kept below 25°C. Open the aerator for 1 to 2 hours every day. (4) Disease prevention and control. Disease prevention refers to the management method of the four major fish, focusing on water quality management and bait disinfection. On average, every 15 to 20 days, the body of water is alternately disinfected with lime and chlorine dioxide. Ensure that the feeds fed are fresh live bait and the foods are sterilized. The fish found in the culture has putrefaction, and chlorine dioxide may be sprayed on the whole pool at a dosage of 0.3 mg/kg. (5) Daily sales: management. Observe changes in fish movements and water quality, and keep the water transparency at about 30 cm. When the weather is hot, add new water and use aerators. Find problems and take timely measures to resolve them. Strictly prevent pesticides, harmful substances, etc. from flowing into the pool. Juveniles are extremely sensitive to pesticides. Few doses can cause the death of the whole fish fry. Care must be taken. Disinfect the body of water with lime and chlorine-rich water in a timely manner to achieve the purpose of preventing disease.
Hemorrhoids are widely distributed in cold temperate zones in Europe and northern Asia. They are only produced in the Irtysh and Wulun river basins in Xinjiang. This fish is tender and delicious, and it is one of the important economic fishes in the cold and temperate regions of northern Europe and Asia. In order to increase the income of farmers and improve the structure of farming, we carried out experiments on the introduction of river rafts and pond aquaculture from 2005 to 2006, and achieved remarkable results. The average net profit per 667 square meters (1 acre) reached 6,000 yuan. The main technologies are introduced as follows: