The suitable water temperature for tilapia reproduction is 22--23°C, and natural spawning usually occurs after mid-May. In order to grab the season and make full use of light, heat, and bait resources, we must take artificial warming and strengthen cultivation so that tilapia can lay eggs early in mid-April to hatch. The specific technical measures are as follows:
(A) broodstock selection and cultivation. The broodstock with good maturity was selected to be placed in the spawning pool in mid-March to strengthen the cultivation. The wintering pool can be used for the spawning pool. It is advisable to stock up to 6 broodstock per square meter of spawning pool, with a ratio of 2:1 or 3:1 for males and females, and to change water regularly.
(B) warming and feeding management. The water temperature in the pool should be controlled at 23°C and the water quality should be fat, live and cool. The amount of feed should be determined according to the water temperature, water quality and growth of the fish. Generally, the daily feeding amount of the static pond is 2% of the fish body weight, and the flow pool is 3%. At the same time, we must constantly observe the fish activity and gonadal development, and make a record.
(c) Spawning. There is a clear difference between tilapia male and female body color, estrus male swimming in the pool, looking for a place to make a nest, the shape of the nest like a pot, diameter 30--40 cm, depth of about 10 cm. After the nest was completed, the males started to seduce the females from time to time, and intercepted the pairing of the females into the nest. When the water temperature reaches 22--23°C, females can lay eggs. At the time of spawning, the abdomen of the female fish is close to the bottom of the burrow, and the male fish is guarded by the nest. After the females lay eggs, the female eggs are sucked into the mouth immediately, and the mandibular protrusion is saccular. The male fish immediately entered the nest, and the females infused the semen with the water and the eggs were fertilized in the oral cavity.
(D) hatch. The tilapia fertilized eggs hatch in the female's mouth and turn with the female's breath, which protects the mother and has a good incubation environment. When the water temperature is around 30°C, the fry is hatched for about 4 to 5 days; it takes about 7 days at 25°C. (Real Technology Institute, No. 121 Renmin Road, Binhai County, Jiangsu Province, Zhang Shizhen, Jiang Zhi, Zip Code: 224500)

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