Ding fish farming technology
Ding fish is a rare indigenous fish in the Irtysh River, Xinjiang, China. Due to its delicate meat, rich nutrition and good taste, Dingyu has a good market prospect. Ding fish is highly adaptable to the environment and temperature, and it is able to endure low oxygen and is suitable for high-density large-scale factory culture. As a new breed of aquaculture to be promoted in the Mainland, it has very broad prospects for development. In June 2002, Dingyu fry was introduced into the Jinnan Special Aquatic Breeding Base, which is owned by the national Tianjin Jinnan District Agricultural Science and Technology Park. After 5 months of cultivation, good results have been achieved. First, the biological characteristics of Ding fish is grayish yellow, head short, small mouth, fine scales, back was dark blue, pale belly, fins are black and yellow. Ding fish is benthic fish, the survival temperature of 0-38 °C, the appropriate growth temperature of 14-28 °C, the water temperature of 32 °C stop feeding. Ding fish quiet fear, shock, fear of light, sexual docile, resistant to hypoxia, like cluster life. In the natural environment, the sexual maturity age is above 3 years old, and the sexual maturity age can be advanced in the breeding environment. The sexually mature D. acutus fish has a large difference between male and female. The first fins of the pelvic fins of males are thick, the fins of females are not branched, the fins are small, and the caudal fins are slightly concave. Ovum sticky eggs, mature egg diameter of about 0.45 mm. Mature females have a fecundity of 50-300 capsules/gram. Ding fish is an omnivorous fish, the main food in the natural waters is the bottom of the organic debris, aquatic insects, plankton and so on. It is easier to acclimate and feed pelleted feed in aquaculture environment, and the protein content requirement is 35%-40%. Second, aquaculture technology 1, can choose 50-80 square meters of rectangular cement pool as adult fish breeding ponds, stocking density of 80-100 per square meter. The fish pond requires a perfect intake and drainage system, and the sewerage system should be smooth. Keep the water in the pool fresh and ensure that the pool's dissolved oxygen reaches 5 mg/L or more, which is conducive to the rapid growth of the fish. Due to the calmness of the small fish, fear of glare, fish ponds to avoid direct open-air design, direct open-air fish ponds to cover shade objects better, the breeding environment should be quiet. 2, should choose a healthy, neat specifications, bright body, disease-free and injury-free fish species. Put salt, formaldehyde and other drugs in the bath before disinfection to kill pathogens. 3, the cement pool culture Ding fish, domestication can be fed granular artificial feed. According to the size of the fish to choose a suitable size of feed, from fish to commercial fish can be fed 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm particle size of the pellet feed, protein content of 35% -40%. 4, Dingyu fish disease resistance is strong, but in high-density culture should pay attention to observe fish disease situation. To prevent the main, regularly change the water, regular disinfection, regular feeding baits. The use of biological agents such as photosynthetic bacteria and nitrifying bacteria in water transfer, and the use of non-toxic drugs such as bromochlorohydantoin, povidone iodine, and chlorine dioxide are not used.
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