Choose a broodstock to choose a brooding, harmless broodstock with a healthy, plump body. Females should choose more than 3 years of age, body weight is generally 3 to 5 kilograms; males choose more than 2 instars and weigh 1.5 to 2 kilograms. In the non-breeding season, females and males need to be reared in ponds for daily management, especially to avoid premature spawning of some mature broodstock when they are male and male. Generally about 50 female fish per acre, about 100 fish for males, daily timing, fixed-point, and quantitative feeding of concentrate feed, the general feeding amount is 2% to 3% of the broiler's body weight, and it can be fed normally. Some of the fermented pigs and chicken droppings must be filled with fresh water at the same time to keep the water fresh, reduce disease, and promote gonad development.
In the spring of each year, when the temperature of the water rises above 15°C, breeding of carp can be carried out. Pairing squid to prepare for spawning ponds and hatching ponds, the size of the two ponds depends on the number of broodstocks, hatching ponds best choose leeward sunny place. However, both ponds have been thoroughly cleared with drugs to kill natural enemies and miscellaneous fish. The pond edge grass should be cleared and no basal fertilizer should be used to keep the water cool. After doing a good job on the water, you can pull the net to broach the fish pond and pick and breed the broodstock. However, we must pay attention to the weather forecast. If there is a cold air invasion in a few days, do not pull the net. Choose a female fish that is enlarged, soft and elastic in the abdomen to breed, and then place it in the spawning pond at a female and male ratio of 1:5. Set up fish nests at the entrance of the fish ponds, and use bamboo sticks to form a square. The size depends on the number of broodstocks, and put a clean, sterilized water hyacinth in the middle to form a fish nest. Inject new water every day to stimulate broodstock oviposition. After spawning, the eggs of water hyacinths are sterilized to reduce the incidence of watery mildew. Disinfect and transfer to hatching pond that has been prepared. To reduce the trouble of transferring fish to the pond, about 300,000 fish eggs can be placed per acre.
The hatching of fish eggs and the cultivation of fry eggs In the case of rainy weather or cold air after the fish eggs are placed in the hatchery pond, the fish eggs can be covered with straw or film or the water depth can be increased accordingly. The filming time of fry is generally about 7 days, with slight increase or delay of the temperature. After the fry have the swimming ability, they will take out the fish nest again, but they must pay attention to cleaning the water hyacinth to prevent the fry from clearing with the fish nest. Within 3 to 5 days after fry release, some soymilk or fermented peanut bran can be fed. Amount per acre is about 2 kg. Quanchiposa. As the fry grows up, it can also be gradually poured with large manure or fed chicken and pig manure. At the same time, in order to improve the mobility of the fry, daily use branches to drag the pond 1 to 2 times. Every morning, we must also observe that there are no floating heads in the fry. If there are any, we should re-inject new water. After there is no floating head phenomenon, divide the pond and lower the density. Normally, put 10 to 200,000 per mu, and gradually raise 10 cm deep every week. water. As the fry grows, the fry can be sold gradually.
Width:250mm*Length:1800m*Thickness:25um
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