First, the collection of broodstock
Select a healthy body, full body plump, bright body color, body size to head small, body height, back thickness, body height to body length ratio of about 1:2.5 best. Carp female body weight of 1.5 to 5 kg, aged 3 or more, male body weight of 1 to 2.5 kilograms, age 2 or more. Carp female body weight 0.15 ~ 0.25 kg, aged 2 or more; male body weight 0.05 to 0.1 kg, age 1 to 2 years.
Second, prepare for the cultivation of the pool
To choose a leeward, sunny, warm, easy irrigation and drainage pond for cultivation, the area of ​​l ~ 2 acres or a few points of the small pond can be, the depth of 1 to 2 meters. The collected broodstock is incubated in a special pool, which can be used as a spawning pool. An alternative hatchery area of ​​about 0.5 mu can double as a fry cultivation pool. Before the broodstock is stocked, disinfect the pond with about 75 kg of lime per acre, depending on the depth of the water, and increase or decrease the amount of lime.
Third, the identification of male and female
In the winter non-reproductive season, the discrimination methods of female and male broodstock are: the height of the female cephalopod is high, the abdomen is large and soft, and the vent hole is large and prominent; the male's opposite head is larger and narrower, the belly is narrower and shorter, and the vent hole is slightly smaller. Concave.
Fourth, the stocking of broodstock
Generally, 100-150 kilograms of broodstock are stocked per acre, and about 20 catfish are added per acre. Plankton is eaten in water to prevent the water quality from affecting the growth of carp and carp. Conditional mariculturists may prepare two small ponds to separate the male and female broodstock, or separate them with bamboo curtains in the middle of a pond to avoid sudden rise of early spring temperature. The male estrus estrus stimulates precociousness, the females give birth prematurely, and fish eggs Loss.
Fifth, feeding of broodstock
Clam and salmon are omnivorous fish. Common feeds include bean cakes, bran, rice bran, distiller's grains, bean curd residue and corn flour. Broodstock ponds can also be used to fertilize pig manure and human urine, but they should be fed with protein-rich feeds such as bean cakes, cocoons and snails. Feeding should be less and more refined, generally 3 to 4 days feeding 1, when the water temperature above 15 °C, feed once a day, to eat within 1 to 2 hours. During the winter, the water level should be raised. After the spring, the water level should be lowered before the spawning.
Fifth, the self-propagation of fry
From March to April of the following year, the willow roots or palms are sorted into small bundles and boiled and sterilized. A female fish is fed with 4 to 5 bundles of fish nests into a cultivation pond. The sunny male and female broodstock is selected at a ratio of 1:1 or 1:1.25. Pairing, water injection 10 to 15 cm to stimulate the broodstock spawning, and then the nest of the nested eggs into the incubation pool hatch. During the incubation period, pay attention to the climate change. When the weather is getting cold or in the evening, the fish nest should sink deeper and be covered with straw mats and reeds. Under normal circumstances, high quality fry can be obtained within 5-7 days.
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