The artificial breeding of stingray is a new breeding technology developed in recent years. The techniques for breeding stingray, seed breeding, pond raising, and cage culture are introduced as follows: 1. Stingray breeding and seed breeding techniques 1. Broodstock Selection and cultivation: choose smooth body surface, complete fins, disease-free and non-injury weight of 75-100 g for females, and 125-150 g of natural wild-caught second-instar catfish as male parent fish, and compare male and female ratios. The ratio of 1:1.2 was put into a pond for special pool cultivation. 2, artificial oxytocin: oxytocin should be selected before the female abdomen enlargement, soft, and a small amount of light pressure on the abdomen out of the abdomen; male should choose the abdomen expansion, hand squeezing out of semen out of the broodstock and quickly spread in the water as a trophozootoxin. Four birthfish breeding facilities can be used for oxytocosis equipment. Because stingrays have the habit of digging acupuncture points, the fish nest must be set on the bottom of the spawning pool and the fish nests should be tightly bound to prevent the brooders from destroying the nest when they lay eggs. The oxytocin-producing broodstock is 1:1 male and female, and the oxytocin-producing drugs are generally LRH-A2, human chorionic gonadotropin (HCG), domoxone or their mixture. After spawning into the spawning pool, let it spawn naturally. 3. Artificial hatching: Stingrays are spawning fishes in batches. Spawning time is long and generally lasts more than 6 hours. The majority of broodstock should be produced before they can be moved into the hatchery ring or hatch. Cylinder hatched. Since the eggs of the stingrays are attached to the fish nests, only the microfluidic water can be maintained during hatching, and the fish nests with the fish eggs can also be placed in a static water tank or hatched in cages. When the stingrays are incubated in still water, Oxygen equipment oxygen should be arranged. 4, fry cultivation: When the water temperature at 25 °C, fertilized eggs hatched two days later, the fry began to film, the film began to Feed on the third day after the opening bait is a small zooplankton. At this time, the fry must be transferred to the fry culture pond for transfer. The open bait of the fry should be cultivated beforehand, supplemented with artificial diet such as egg yolk and fish pulp. The fry incubation period (1.5cm before) is mainly based on the cultivation of natural food. When the fry grows to 1.5cm, it must begin to switch to feed and feed more compound feed every day until the fry completely feed the compound feed. When the fry grows to more than 3cm, the next stage of cultivation can be carried out. Second, the main pond stingray technology 1, pond selection and cleaning and disinfection: choose a good water quality, adequate water supply ponds, water depth of more than 1.5m, the area is generally 2-10 acres of ponds. For ponds with silt exceeding 10cm in the bottom, excessive silt must be removed. After clearing excess silt, do not fill it immediately. Instead, it should be cleaned and sterilized after sun exposure for a few days. 10-15 days before stocking, 50-75 kg of quicklime or 7-10 kg of bleached soda will be sprayed on the entire pond. 2, fish stocking and species collocation: fish species breeding time is generally selected in the winter or early spring, stocking specifications are generally more than 20 grams / tail, stocking density is generally 2000-3000 tail / acre. Before stocking, fish can be stocked with a 3-5% saline solution for 10-15 minutes. At the same time, with the summer fish species of the white pelicans, the flower buds are 1,000 tails/mu and the white pheasant is 3000 tails/mu. 3. Preparation and feeding of bait: Stingray is mainly carnivorous, and can be directly used to minced the animal bait such as small fish, shrimp, snail meat, livestock and poultry waste, and used 3-8%. The flour is used as a binder, stir well and put on the feed table. For the lack of animal raw materials mentioned above, the formulation can be made into pellet feeds according to the formula of fish oil 30%, bean cake 30%, bran 20%, corn 10%, flour 6% and 4% fish oil and minerals. It is also possible to purchase full-price stingray compound feed from professional manufacturers. Feeding adopts the “Four Sets†principle, and it feeds twice daily, and the daily feed rate is controlled between 5-8%, depending on the fish’s food intake, weather, and water temperature. 4, daily management and disease prevention and control: Stingray main water quality regulation is very important. From the beginning of May, new water should be filled every 10-15 days, each time water injection 10-15cm. If it is found that the water quality is too fat, part of the old water should be drained in time and new water should be added to ensure that the fish eat well and grow normally. Observe the scenes on a daily basis, manage food platforms and foods, inspect fish, and keep records of fish farming. At the same time, prevention and control of diseases should be carried out in accordance with the principle of “prevention from prevention, prevention and controlâ€. In the fish disease epidemic season, 1 ppm bleach or 25 ppm lime should be spilled every 10-15 days. In the daily inspection of the pond, we must observe the fish activity, early detection of the disease, timely treatment and treatment to prevent the spread of the disease. Stingrays are scaleless fish and are more sensitive to drugs. Trichlorphon, copper sulfate and other drugs should be used with caution. Third, the stingray cage culture technology 1, the choice of waters: Select the leeward sun, water depth of more than 4 meters of the Bay, Lake Fork, rivers and other waters to place cages. 2. Production and installation of cages: 33 polythene nets, 3m in length, 3m in width, 1.6m in depth or 4m in length, 4m in width and 1.6m in depth; 3cm in outer mesh, 1cm in inner mesh . Net cages are made of bamboo and floated, and anchor ropes are used to fix them into "one" or "goods" fonts. 3. Stocking of fingerlings: stocking density of tail weight 25g is 100 tails/m2, and stocking density of tail weight 50g is 70 tails/m2. When the fish species is put in the box, bath with 3-5% saline solution for 10-15 minutes. 4. Feeding management: The daily feeding amount is 5-8% of the fish's body weight, which should be controlled flexibly depending on the weather, water temperature, and fish activity. The number of feedings is twice a day, that is, in the morning and in the evening respectively, and it is advisable to eat within one hour after each feeding. According to the habit of feeding the yellow mullet at night, the feeding amount should be 60% in the evening and 40% in the morning. Feeding should follow the "four principles" principle. 5, daily management: wash once every 7-10 days, clean the feed table once a day. In order to prevent the box from fleeing fish, you should carefully observe and inspect the nets every day for any damage or slippage. Repair them if necessary. In order for the stingray to ingest food normally, a shade net should be placed over the cage. 6, disease prevention and control: Scarlet disease less, once the incidence of greater losses. Therefore, prevention should be the main method in cage culture. The feed table should be disinfected once a day, and lime water should be spilled regularly in the cage. Stingrays are fish without scales and are sensitive to trichlorfon, copper sulfate and other drugs and should be used with caution.
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