The stingray is a genus, genus, and genus. Commonly known as Huangla Ding, ounces. The stingray has a delicate meat quality, less thorns, more fat, delicious taste, and high nutritional value, and is very popular in the domestic and international aquatic markets. The stingray camp benthic life, inhabits the water bottom during the day and swims to the water layer during the night. Stingray is a warm-water fish, the optimum growth temperature is 22-27°C, and the optimum pH is 7.0-8.4. The main breeding techniques are introduced as follows: 1. Pond ponds cover an area of ​​5-8 acres, with a water depth of 1.5-2 meters. After the winter fish species have pooled or ponded negatively, the pool water is drained, the sludge at the bottom of the pond is cleared, and the bottom of the pond is exposed. After the spring, clear the entire pond base, with 150-200 kilograms of lime into slurry for every acre. In the second day, add water to the water depth of 1.5 meters. In the first 3-4 days, 300-400 kg/mu fermented mature organic fertilizer is applied to cultivate natural food organisms. After 7-10 days, the toxicity of calcined lime can be completely eliminated. Fish species. Second, the main pond raises 1. The stocking time of fish species is in April, and the stocking density is generally 10 to 20 grams of yellow sturgeon reared on an acre basis, with 1500 to 2500 tails. The fish species are washed with 3% to 5% salt water before stocking. -15 minutes. After 10 days, about 50 grams of alfalfa, 1,000 species of carp, and 200 first-year species of grass were planted per acre of water. 2. Nutrition and feed feeding water temperature above 15 °C, start feeding, use fresh small fish, shrimp, snail meat as bait, meat grinder made with meat grinder, can also be crushed after the fixed point vote can also be fed Fresh seawater chilled fish and stingrays are fed with chilled fish paste for a small hour, and when they are large in size, they are fed with chilled fish or fish. First, they are thrown around the pond to induce food intake. Afterwards, the range is gradually narrowed and slowly induced. The upper bait feeds on the feed, and after 7 days of domestication, it is fed twice a day to reach the timing of feeding the animal bait on the bait station. From late April to early May, two shots are cast. The amount of fish fed was 1%-3% of the fish body weight. After mid-May, it was fed 3 times a day, and the amount fed was 5%-8% of the body weight of the fish, which was appropriately adjusted depending on the feeding condition of the fish. The purpose of cost reduction and efficiency increase is to achieve the purpose of reducing the cost and increasing the efficiency of the squid division. In the beginning of domestication, 10% formulated feed can be added to the original fish, shrimp, and snail carcasses, and the amount of formulated feed can be increased accordingly. After about 10 days of taming, it can be completely shot. Feeding compound feed Third, the pond set up conventional commodity fish pond rich in natural food resources, plankton, There are many species of cockroaches, small fish, shrimp, aquatic insects, etc. Nesting of stingrays does not increase the feeding amount of the ponds, but also obtains stingrays with a certain yield, which does not affect the breeding of the main cultured fish in the ponds. Feeding small fish, shrimp, aquatic insects, etc. in the pond also has a great effect on clearing the wild fish in the pond.The size of the yellow sturgeon fish to be released is 2-3 cm, and about 500 stocks per acre are stocked. Yellowtail catfish can not only increase production and income, but also stingrays can eat on the surface of the fish on the surface of the anchor head and the water foot of the copepods to reduce the occurrence of fish diseases.Four daily management 1. Water management pond early water depth 0.8- 1.2 meters, later 1.2-1.5 meters, transparency is controlled at about 30-40 centimeters. In the hot season, the amount of bait increases, the water quality changes quickly, it is necessary to add new water in time, and start the aerator to ensure the dissolved oxygen in the pool water. Above 3 mg/L, use quicklime once every half a month in the aquaculture process, and use 15-20 kg Quan Quan per acre to control the pH value of the pool water to create an environment conducive to the growth of yellow catfish. Observe the fish dynamics. The pond was patrolled three times in the evening, and whether the fish was floating or not was observed at dawn, and the feed and water temperature were measured during the daytime: it was done to check the fish activity and feeding conditions. Feed, whether there are signs of floating head, and when ready to call.. 3. Anti-escape to grasp the pool of water injection row, to maintain the appropriate amount of water, prevent the escape of fish. Usually with the fish growth, combined with the adjustment of water quality, timely increase the amount of water. Disease Prevention and Treatment Huangqi has strong resistance to disease, and can regularly use "granular oxygen" for oxygenation of the bottom layer; regular use of "bottom net treasure" to improve the quality of pond sediment, remove reducing harmful substances, increase oxidation-reduction potential, and maintain good water quality In general, the disease does not occur in culture. Stingray eat unclean food susceptible to enteritis disease, vote, feed the full price of compound feed is less common. Once you have found the risk of enteritis, you should first check the feed, stop feeding unclean Feeding the bait at the same time, add 15 grams of oxytetracycline or norfloxacin per kilogram of bait and feed it continuously for 3-5 days.
Feed Enzymes
Feed additive enzymes Simple classification of feed enzymes:
1.endogenous enzymes, refers to the animal body can secrete digestive enzymes, the main function is to digest the nutrients in the feed used to improve the digestibility of feed; The digestive system of young animals is not perfect, and the digestive enzymes secreted by the body are insufficient. In particular, a large amount of endogenous enzymes should be added to the feed based on plant raw materials to solve the digestive problems. Endogenous enzymes generally refer to protease, amylase, lipase and so on.
2. Exogenous enzymes refer to the enzyme preparations that animals cannot secrete autonomously and must be added. The main function is to degrade the anti-nutrient factors of plant raw materials, non-starch polysaccharides that hinder the release of nutrients and react with the contact of endogenous enzymes, such as cell walls, and non-starch polysaccharides that bring negative effects; Common are phytase, xylanase, glucanase, cellulase, mannanase, galactosidase, etc.
3.functional enzymes, mainly use its catalytic function to achieve the processes and products we need, such as glucose oxidase, a brief overview is the catalytic process with glucose to consume oxygen, produce gluconic acid and hydrogen peroxide, Reduce the PH value of the gut, and use its strong oxidation to alleviate mycotoxin poisoning and protect the health of the digestive system, improve immunity and other functions; In addition, there are catalase, lysozyme and other related products, the specific function is not this unnecessary
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