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
The broodstock should be selected as a physically strong, full-bodied, disease-free, non-invasive individual. 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, female and male fish are best kept in ponds for daily management. Generally, 50 mules are stocked per mu (1 mu = 667 square meters, the same below) and about 100 males are fed regularly, fixed-point and quantitative feeds such as peanut bran, soybean and corn. 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 disease and promote gonad development.
2, breeding technology
Every spring, when the water temperature rises above 18°C, breeding and hatching can be carried out. The best choice for incubator ponds is 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 in a ratio of 1:5. In the entrance to the fish pond, a square fish nest made of bamboo sticks is set, 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. Daily injection