The stingray is a scorpion-shaped head, a genus of the genus Euphorbia, a genus of the striated genus, commonly known as sardines or yellow thorn fishes. It is a small-sized freshwater fish and is generally 200 to 300 g in size. Its meat is delicate, and it has less stabless scales and is delicious. Nutrient-rich, favored by the majority of consumers, the market price is generally around 20 yuan / kg, is a high economic value of the famous fish. The development of cage culture of stingrays in lakes, reservoirs, rivers and other water bodies can effectively utilize water bodies and achieve higher economic benefits. The technical measures are now described below. 1 cage design 1.1 cage specifications cage made of polyethylene, mesh screen mesh is generally required in the 2.0 ~ 3.0cm, the net mesh is 1.5cm, cage specifications to 12 ~ 24? Deep requirements 2.0m. 1.2 The cage is set up with a frame made of bamboo or wood, and the cage is placed in the frame. The cylinder foam is used as a float, and the bottom of the cage is made of cobblestone as a sinker. The cage moves up and down as the water level rises and falls. The water quality of the cages set up in the water area is required to be live and cool, and the dissolved oxygen is high. One week before stocking, the cages were placed in water to make the cage wall adhere to algae and reduce fish scrape. The distance between the cages is 2 to 3 meters. 2 Breeding of fish rearing cages Stingrays are generally introduced before and after the Spring Festival, when the water temperature is low, the fish is not easy to be injured, and the fish species need to be washed with 10 g/m3 malachite green or 5% salt water before going down the box. Fish body to kill parasites and germs. The density of stingray cultured in cages is generally 100 to 150 tails per inch. In addition, it is advisable to adopt some group-headed breams and fine-scaled ramets to properly utilize the bait to purify the cage water. At the end of August, it can reach 200g/over. 3 Baits Feed Stingrays are carnivorous fish that can be fed animal feed such as small fish, shrimp, livestock and poultry processing waste, and vegetable feedstuffs such as vegetable cakes, bran, and bean dregs. Generally, they are fed twice a day, and they are fed once every morning from 9:00 to 10:00 and from 16:00 to 18:00 in the afternoon. The daily feed amount was 3% to 6% of fish body weight. 4 daily management should pay attention to observe the activities of fish and feeding conditions in order to adjust the amount of feeding. Periodically (usually 5-7d) clean the cage and the surrounding attachments to maintain the convection of the water body. Check the cage for damage and prevent fish escape. Also pay attention to changes in the water level, and solve the problem in time. 5 fish disease prevention cage fish culture in the prevention and treatment of fish disease should adhere to prevention, often with bleach or copper sulfate and ferrous sulfate mixture (5:2) bag, usually replaced once a week, while regularly in the feed Antibiotics are added to the fish to ensure the healthy growth of the fish. 6 Timely harvesting and listing According to the market conditions and the growth of fish, timely arrest and listing will be conducted to maximize the economic benefits. Cage cultured stingrays are generally sold in batches from the beginning of August. The aquaculture benefit is about 40-50 yuan/m2.
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