Tilapia Artificial Propagation Techniques
When tilapia is artificially propagated, winter broodstock can be moved to outdoor breeding ponds when the water temperature rises to about 20°C in the spring. The breeding pond area should be 1-2 mu and the water depth is 1.5 meters. Because the tilapia has the habit of breeding nests, the bottom of the pond for breeding ponds should be loam or sandy loam.
The broodstock used for breeding should be selected to have a healthy, disease-free, non-injured fish. The size of the broodstock should be 150-450 grams; 300-400 tails of the broodstock should be released; the proportion of male-female broodstock should be 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-sized ponds can reproduce. In the Yangtze River basin, Mozambican tilapia and longevity fish, sexual maturity can be achieved within 3-4 months after the harvest. After wintering, the fish species In 1-2 months, spawning can be propagated.
After wintering, the broodstock is relatively thin, so it is necessary to intensify cultivation before spawning to promote the growth and reproduction of the gonad gonads. Before use for breeding, 300-500 kg of base fertilizer should be applied per acre. After the broodstock is stocked, 50 kg of organic fertilizer should be topped every 1-2 days, and feeds such as rice bran and bean dregs should be fed. The amount of broodstock should be about 3% of the body weight of the broodstock. When the water temperature reaches 22-23°C, the tilapia can lay eggs and fertilize eggs yellow-brown. The fertilized eggs hatch in the female's mouth. When the water temperature is 25°C, the newly hatched fry is hatched 5-7 days and still lives in the female's 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.
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