The suitable water temperature for tilapia reproduction is 22°C to 23°C, and natural spawning is generally performed after mid-May. In order to grab the season and make full use of light, heat, and bait resources to increase aquaculture production, it is necessary to artificially increase the temperature, intensify cultivation, and early spring propagation so that tilapia can be hatched and hatched in mid-April. The specific technical measures are as follows: I. Selection and breeding of broodstock Select broodstock with good maturity and put it into the spawning pool in mid-March to strengthen cultivation. 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. Second, warming and feeding management pool water temperature should be controlled at 23 °C above, feeding amount should be based on water temperature, water quality and fish growth may be. In the general cistern, the daily feeding amount is 2% of the fish body weight, and the flow pool is 3%. At the same time, we must constantly observe the activities of fish and the degree of gonadal development, and do a good job in all aspects of the record. Third, spawning tilapia male and female fish body color has a clear distinction, estrus male swimming in the pool, looking for a place to do nest. The shape of the nest is pot-shaped, with a diameter of 30 cm to 40 cm and a 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 °C ~ 23 °C, the female 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. 4. Incubation of tilapia fertilized eggs hatch in the female's mouth and turn with the female's breathing, which not only protects the mother but also has a good incubation environment. When the water temperature is around 30°C, fry is hatched in about 4 days to 5 days; when it is about 25°C, fry can be hatched in about 7 days.
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