A new method for pond breeding in stingrays

The culture of ponds of adult stingrays can be changed from stocking fishes in stocking to stocking in the summer. This way can shorten the breeding cycle, reduce the production cost, and achieve high yield and high efficiency. Practice has shown that stocking species of 2 cm to 5 cm in size of yellow sturgeon fish are reared for 6 months to 8 months. The weight of commercial fish can reach 80 grams to 150 grams, and the yield is 300 kilograms per 667 square meters. 3000 yuan or so. The technical points are now described as follows:
The pond requires that the stingrays have poor tolerance to hypoxia and have high ecological requirements. It is advisable to choose a rectangular fishing pond with sufficient water sources, fresh water, and convenient drainage and drainage. The area is generally from 2001 square meters to 4002 square meters and the water depth is 1.5 meters. 2 meters. In order to facilitate the growth of stingrays, the bottom of the pool should be flat, and the bottom soil should be easy to breathe with loam, and clay and less sand with hard bottom. The thickness of sludge should be less than 10 cm, and the pool pools should not leak. The pond has an independent intake and drainage system, and the inlet is screened with a 30-mesh screen to prevent wild fish from entering the enemy. The drain is provided with a wire mesh to prevent fish from fleeing.
Two weeks before the stocking of the Qingtang River, the pool water is drained to remove weeds and excessive silt. Each 667 square meters is sterilized with quicklime (125kg to 150kg) and crystallized trichlorfon (1kg to 1.5kg). Kill pathogenic organisms. After 5 days to 7 days of disinfection, new water was injected, and 200 kg of water was applied per 667 m2 of manure. After 7 days to 10 days, a large number of plankton in the pool could be released.
Fish stockings are generally stocked with yellow catfish species in June. Each length of 667 m2 is stocked with 2 cm to 3 cm seedlings and 3000 to 4000 tails. The total length of 4 cm to 5 cm seedlings is 2000 to 2500. . When the fish species grows to 7 cm to 8 cm, the water quality has become fat. At this time, about 8 centimeters to 10 centimeters of squid species are added every 667 square meters to regulate the water quality. When fish species are stocked, they are soaked with 3% saline for about 15 minutes.
Feeding stingrays for feed is a partial animal omnivorous fish. The smaller the fish body is, the higher the content of “fungus” is. After the fish species are stocked, 8 cm in length, the plankton should be cultivated by fertilization to keep the appropriate water in the pond while feeding animal feed such as fish gills, and tapping the drum before feeding to allow the fish to form a conditional reflex. The lure fish is concentrated on the food table. After 1 week, they were mixed into a dough form with compound feed such as squid, mackerel, soft-shelled turtle, or frog, and they were fed once a day in the morning, middle, and evening. Each time the amount of bait was 1 to 2 hours. When the stingray grows to 8 centimeters in length, domesticated artificial feed is used for acclimation. During the period of domestication, the amount of sturgeon is gradually reduced in the fed feed to increase the proportion of feed. Generally, the habit of feeding artificial compound feed can be formed after about 10 days. . Feed should use full price formula: crude protein content 38% to 40%, crude fat 7% to 9%, carbohydrate 20% to 30%, cellulose 5% to 6%. Feeding should adhere to the principle of "Four Sets" and timely adjust feed particle size according to the size of fish. From June to September, there are three feedings on the general day. The time is roughly 7:00 am, 4 pm, and 8 pm. After October, two shots are made. The time is 7 am and 4 pm, and the amount of feed depends on the water temperature. , water quality, weather and fish feeding conditions are flexible. Generally, the daily water temperature is from 1.5% to 1.8% of the fish's body weight at 10°C to 15°C, the water temperature is from 2% to 3% at 15°C to 20°C, and the water temperature is from 4% to 5% at 20°C to 32°C.
Water quality management Grasp the appropriate water level: When the fingerlings are in the pool, the depth of the pool should be kept between 70 cm and 80 cm in order to facilitate the increase of the water temperature and the reproduction of plankton. After that, the water depth will gradually increase to 1.5 m to 1.8 m. Control of pool water fertility: Stingray 8 cm in length before the main intake of plankton, should be appropriate fertilization to maintain the appropriate amount of pool water, transparency in the 20 cm to 30 cm; fish body length of 8 cm or more, food has changed, Fertilizers should be changed to feed feed, control the pool water fertility, maintain a transparency of about 30 cm, dissolved oxygen above 4 mg/l. Regularly add new water: Normally, every 10 days to 15 days, fill water once. During the high temperature season, change the water every 7 days to 10 days. Change the amount of water by 15 centimeters to 30 centimeters each time. Adjust the water quality of the pond: 20 g water of quicklime per cubic meter of water shall be splashed once every half month to maintain the pH of the pool water between 7 and 8.4; use 2 kg of bleaching powder every 10 days in the food farm and aerator. 5 kg of calcined water is sprinkled once to disinfect local water bodies; each tank is equipped with an aerator of 1.5 KW aerator, and the oxygen is turned on scientifically and reasonably according to the changes in weather and water quality.
During the prevention and control of fish diseases, we must adhere to the principle of “prevention first,” and regularly disinfect water bodies, food premises, and fresh live food to maintain a good ecological environment. Common diseases include enteritis, hemorrhagic edema disease and so on. Prevention of enteritis disease, regularly add 1% salt or garlic juice in the feed to prevent; every cubic meter of water body during treatment with 1 g of bleaching water Quanchiposa, while feeding sulfamethoxazole baits, on the first day, per 100 kg of fish medication 10 grams, halved after the second day, even fed 6 days. To prevent and treat hemorrhagic edema disease, 0.3 g of strong chlorine essence per cubic meter of water is used to sprinkling water to the whole pool once a day for 3 days, and feeding 0.6 g to 0.7 g of tetracycline per kilogram of feed in the feed, once a day. , feed for 3 days. Stingrays are scaleless fish and their tolerance to common aquatic drugs is less than that of the four major ones. The 24 hour and a half lethal concentrations of several commonly used drugs are: copper sulfate 0.69 mg/l, 90% crystal trichlorfon 2.8 mg/l , Salt 25 grams / liter, formalin 68 mg / liter. Therefore, when administering the stingray, it is necessary to strictly control the dosage and avoid drug poisoning.

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