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1. Early selection of each pool: The early morning pool can be constructed where there is a lot of warm water in winter. Plastic sheds can also be used to keep every fry early, but heating facilities must be provided.
Early-generation ponds should be built on the plains in the east-west direction and be excavated in a long trench pond, which is about 120 meters long, 4 meters wide, and 1 meter deep, with a water depth of 0.8 meters, or fish ponds of similar conditions.
2. Broodstock stocking: I am in stocking time, the Yangtze River Valley is generally in late March early April. From the broodstock overwintering pool, select physically strong, non-injured individuals and stocked on a sunny day. Stocking density, general warm water early breeding pond rearing weight of 250 to 500 grams of female fish per acre rearing 800 to 1000 tails; plastic greenhouses in the early spring of aquaculture pond stocked female fish 300 to 400 tails. According to male and female 3:1 matching group, together into the early breeding pool.
3. Feeding and management of broodstock: The broodstock is mainly fed with concentrate feed after entering the pond, and is fed with some fresh chopped cabbage leaves. Feeding twice a day, the amount of feed is based on water quality and broodstock feeding. In general, the amount of water fed to the early-warming pond is 4% to 6% of the total weight of the fish body, and the early-warning pond in the plastic watershed is 2% to 3% of the total body weight of the fish. Measure the water temperature every morning and evening and control the water temperature at 25°C to prevent it from falling.
4. Le cultivating: The broodstock can be seen in 20 to 25 days after being put into the early breeding pool. When the outside temperature is still low, the original pond can be used to raise seedlings. By the beginning of May, the temperature of the external pond water has reached about 20°C, and the fry can be transferred to an outdoor seedling pool for cultivation. Afterwards, the methods of breeding, breeding, basal fertility, fry stocking, feeding, and management of the seedling ponds are the same as those of ordinary seedlings.
Tilapia seed propagation technology
In the late winter of the broodstock, the method of raising the water temperature and strengthening the rearing of the fish was used to promote the early reproduction of the fry. In the end of May and early June, 5 cm long fingerlings were cultivated, which was about one month earlier than the normal seedlings.