When breeding artificially, the wintering broodstock can be moved to outdoor breeding ponds when the spring temperature rises to about 20°C. The breeding pond area should be 1-2 mu and the water depth is 1.5 meters. Because the tilapia has the habit of nest breeding, the bottom of the pool used for breeding ponds should be loam or sandy loam. Breeding broodstock should be selected physically robust, disease-free, non-injured fish, the broodstock should be 150-450 grams in size; mu broodstock fish 300-400; male and female broodstock ratio of 2:1-3:1. Tilapia is characterized by its early sexual maturity, short oviposition cycle and hatching in the mouth. The requirements for breeding conditions are not strict, and generally small areas of hydrostatic ponds can reproduce. In the Yangtze River basin, Mozambican tilapia and longevity fish can mature sexually after 3-4 months of output, after wintering, Spawning can be propagated within 1-2 months. After wintering, the broodstock is relatively thin, so it is necessary to intensify cultivation before spawning to promote the growth and development of the gonad gonads. Every 1-2 days after broodstock rearing, 50 kg of organic fertilizer should be topped and fed with rice bran, bean dregs and other commercial feeds. The amount of broodstock should be about 3% of the broiler's body weight. Generally when the water temperature reaches 22-23 °C when the tilapia can lay eggs fertile eggs fertile yellow, fertilized eggs hatch in the female fish, water temperature at 25 °C 5-7 days hatch hatchery, still living in female fish mouth Inside. When the yolk sac of the fry disappears and has certain swimming and feeding abilities, the fry will leave the mother. At this time, a small group of fry can be seen on the shore of the pond. At this time, the fry cultivation work will begin.
Plasma Products,Anti-Hbs,Safe Plasma,Safe Plasma Storage
Sichuan Yuanda Shuyang Pharmaceutical Co., Ltd. , http://www.syimmunoglobulin.com