The suitable water temperature for tilapia reproduction is 22-23°C. Generally after mid-May, natural spawning, to grab the season, make full use of light, heat and bait resources, improve aquaculture production, artificial warming methods can be taken to strengthen cultivation, early spring propagation, so tilapia in mid-April on Spawning hatchlings. Specific technical measures are as follows.
1. Breeding Broodstock Choosing broodstock with good maturity is put into the spawning pool in mid-March to strengthen the cultivation. Spawning ponds may be used for wintering ponds. It is advisable to stock 6 broodstock per square metre of spawning ponds, with a male-female ratio of 2:1 or 3:1, and change water regularly.
2. The water temperature in the raising pond should be controlled above 23°C. The water quality should be fat, live and cool. The amount of feeding should be determined according to the water temperature, water quality and the growth of the fish. 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.
3. Signs of spawning Tilapia males and females have marked differences in body color. The estrus males swim around the pool and look for nests. The shape of the nest is the bottom of the pot, 30 to 40 cm in diameter and 10 cm deep. After the nest is completed, the males will seduce from the female group and intercept the females into the nest. When the water temperature reaches 22 ~ 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 nest, and the male guards the nest. After the females laid eggs, the eggs were immediately sucked into the mouth and the mandibular protrusions were cystic. The male fish immediately enters the nest and the females suck the semen into the mouth with water. The egg is fertilized in the mouth.
4. Fry hatching 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 about 30°C, the fry hatches about 4 to 5 days; at 25°C it takes about 7 days to hatch the fry.
1. Breeding Broodstock Choosing broodstock with good maturity is put into the spawning pool in mid-March to strengthen the cultivation. Spawning ponds may be used for wintering ponds. It is advisable to stock 6 broodstock per square metre of spawning ponds, with a male-female ratio of 2:1 or 3:1, and change water regularly.
2. The water temperature in the raising pond should be controlled above 23°C. The water quality should be fat, live and cool. The amount of feeding should be determined according to the water temperature, water quality and the growth of the fish. 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.
3. Signs of spawning Tilapia males and females have marked differences in body color. The estrus males swim around the pool and look for nests. The shape of the nest is the bottom of the pot, 30 to 40 cm in diameter and 10 cm deep. After the nest is completed, the males will seduce from the female group and intercept the females into the nest. When the water temperature reaches 22 ~ 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 nest, and the male guards the nest. After the females laid eggs, the eggs were immediately sucked into the mouth and the mandibular protrusions were cystic. The male fish immediately enters the nest and the females suck the semen into the mouth with water. The egg is fertilized in the mouth.
4. Fry hatching 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 about 30°C, the fry hatches about 4 to 5 days; at 25°C it takes about 7 days to hatch the fry.