Spring is the breeding season for salmon. If the following conditions exist, it will seriously affect reproductive performance and economic benefits. First, broodstock lack of maturity, resulting in less spawning, low fertilization rate; Second, the eggs hatched during hatching hydromycosis; Third, cold air or mildew weather during incubation; Fourth, the hatching pond is not completely clear, leaving The natural enemies of fry; Fifth, the daily management of the fry after the film fails to meet the requirements and cause death. For these reasons, the following three tasks should be done to increase the reproduction rate of squid.
1, broodstock selection broodstock should choose a physically strong, full body, disease-free and injury-free individuals. Females should be over 3 years old and weigh 3 to 5 kilograms; males should be older than 2 years and weigh 1.5 to 2 kilograms. In the non-breeding season, the female and male fish are best kept in separate ponds for daily management. Generally, 50 mules are stocked per mu (1 mu = 667 square meters, the same below), and about 100 males are used. Daily, scheduled and quantitative feeds of concentrated feeds such as peanut bran, soybeans, and corn are provided. The general feeding amount is from 2% to 3% of the broiler's body weight. Normally, the fermented pigs and chicken droppings can be properly fed. In addition, the water quality should be kept fresh to reduce the diseases and promote the gonadal development.
2. Reproductive technology Each spring, when the water temperature rises above 18°C, breeding and hatching can be carried out. Incubator ponds are best chosen for leeward sunny ponds. Clear the natural enemies of wild fish and pond weeds. The females with enlarged abdomen, soft and elastic are selected to breed, and they are placed in spawning ponds according to 1:5 female and male ratios. In the entrance to the fish ponds, a square fish nest made of bamboo rafts is arranged, depending on the size of the broodstock, and a clean and sterile water hyacinth with a well-developed root system is placed in the middle. Inject new water every day to stimulate broodstock oviposition. After the spawning is over, you can transfer to a hatchery that is ready for hatching to reduce the trouble of transferring the fish to the pond. About 300,000 fish eggs can be placed per acre.
3. Fish eggs hatching and fry cultivation When the eggs are put into the hatchery pond in case of rainy weather or cold air, the eggs can be covered with rice straw or film, or the depth of the water body can be increased. The fry time is generally about 7 days, and it is slightly advanced or delayed with the temperature. After the fry has the swimming ability, it will take out the fish nest again, but when it is taken out, it must be washed carefully to prevent the fry from clearing with the fish nest. Within 3 to 5 days after frying, the appropriate amount of soybean milk or fermented peanut bran can be fed, and the dosage per acre is about 2 kg. As the fry grows up, it can be gradually poured with feces or fed with fermented chicken or pig manure. In order to improve the motility of the fry, the tree branches can be used 1 to 2 times a day. As the fry grows, it can be sold gradually.
1, broodstock selection broodstock should choose a physically strong, full body, disease-free and injury-free individuals. Females should be over 3 years old and weigh 3 to 5 kilograms; males should be older than 2 years and weigh 1.5 to 2 kilograms. In the non-breeding season, the female and male fish are best kept in separate ponds for daily management. Generally, 50 mules are stocked per mu (1 mu = 667 square meters, the same below), and about 100 males are used. Daily, scheduled and quantitative feeds of concentrated feeds such as peanut bran, soybeans, and corn are provided. The general feeding amount is from 2% to 3% of the broiler's body weight. Normally, the fermented pigs and chicken droppings can be properly fed. In addition, the water quality should be kept fresh to reduce the diseases and promote the gonadal development.
2. Reproductive technology Each spring, when the water temperature rises above 18°C, breeding and hatching can be carried out. Incubator ponds are best chosen for leeward sunny ponds. Clear the natural enemies of wild fish and pond weeds. The females with enlarged abdomen, soft and elastic are selected to breed, and they are placed in spawning ponds according to 1:5 female and male ratios. In the entrance to the fish ponds, a square fish nest made of bamboo rafts is arranged, depending on the size of the broodstock, and a clean and sterile water hyacinth with a well-developed root system is placed in the middle. Inject new water every day to stimulate broodstock oviposition. After the spawning is over, you can transfer to a hatchery that is ready for hatching to reduce the trouble of transferring the fish to the pond. About 300,000 fish eggs can be placed per acre.
3. Fish eggs hatching and fry cultivation When the eggs are put into the hatchery pond in case of rainy weather or cold air, the eggs can be covered with rice straw or film, or the depth of the water body can be increased. The fry time is generally about 7 days, and it is slightly advanced or delayed with the temperature. After the fry has the swimming ability, it will take out the fish nest again, but when it is taken out, it must be washed carefully to prevent the fry from clearing with the fish nest. Within 3 to 5 days after frying, the appropriate amount of soybean milk or fermented peanut bran can be fed, and the dosage per acre is about 2 kg. As the fry grows up, it can be gradually poured with feces or fed with fermented chicken or pig manure. In order to improve the motility of the fry, the tree branches can be used 1 to 2 times a day. As the fry grows, it can be sold gradually.
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