Due to the strong adaptability of heterotrophic silver crucian carp, its adult fish breeding methods are various. The main ways are:
(1) The main pond is raised. The breeding of silver-growth oysters is the main species, and a certain number of fish such as cockroaches, cockroaches, grass carp and crustacean are also provided. In the breeding process, adequate commercial feeds, strong feeding and management techniques are needed to obtain high yields and high efficiency.
(2) Fish breeding pools. Raising fish stocks at conventional stocking densities in fingerling ponds, with no additional feed added, 80 to 120 silver carp species of summer carp reared in each year of stocking, and harvested for half a year to harvest silver per mu.鲫25-40 kg, with an average body weight of 200 g or more, has a survival rate of 90%, and it does not affect the growth rate and the out-of-water specification of the main fish species.
(3) Adult fish pond polyculture. In the adult fish pond that raises other fish, about 100 fish species are reared per acre of polyculture silver sterling, and raised to the end of the year. Each weighs more than 300 grams; dense production can produce high yields and 300-500 polyculture per acre. Tail scorpion summer flowers, raised to the end of the year, a weight of 150-200 grams, production 50-75 kilograms; multiple sets of breeding is conducive to a balanced listing, that is, the first year of stocking 50 grams of fish weight every year of 100 species, May and June During the period of restocking, 200 fishes were grown in summer. Generally, the weight of fingerlings released in the first nine months of the year was more than 300 grams, and they could be listed on the market successively. Afterwards, it was not until spring energy-saving that there were commercial fish of different specifications, each acre. The output of allogynogenetic crucian carp can reach 50-80 kilograms.
(4) Lake stocking. There is a prominent advantage in the non-segregation of filial piety traits, so it is particularly suitable for stocking in lakes, reservoirs, and small lakes with an area of ​​about 5,000 acres, with a 6.6 cm or more heterogenetic silver locust 50-60 per acre. At the end of the year, 10,000 to 30,000 kilograms of fish can be produced. The practice of production over the years has shown that lakes raising fish have a fast growing, high-yield, and can fully utilize the lake's bait resources. At the same time, the catch rate is high. When it is put into operation that year, it will bear fruit. The fish price is good, and the production efficiency can be improved quickly.
(5) Paddy field cultivation. Use the winter cropping fields, the winter glutinous paddy fields and the low-lying fields in the lake area, where only one season of rice is planted, and carry out appropriate reconstructions, heightening and strengthening the field ridges, and repairing the inlet and outlet and fish trapping equipment. It is possible to plant first-season rice and nested fish species. After the rice matures, it will only receive the ear of rice, and then raise the water level to submerge the rice straw, together with stocking pupa, alfalfa, and silver oysters. As long as we pay attention to strengthening management, we must timely inject water as appropriate, apply appropriate amounts of fertilizer and feed, and prevent fish from being fled. We can develop adult fish and some large-sized fish species.
In addition, there are places and units for polyculture of fish gizzards, polyculture with trout, and the use of river rafts and small pit ponds to raise silver trout.
(1) The main pond is raised. The breeding of silver-growth oysters is the main species, and a certain number of fish such as cockroaches, cockroaches, grass carp and crustacean are also provided. In the breeding process, adequate commercial feeds, strong feeding and management techniques are needed to obtain high yields and high efficiency.
(2) Fish breeding pools. Raising fish stocks at conventional stocking densities in fingerling ponds, with no additional feed added, 80 to 120 silver carp species of summer carp reared in each year of stocking, and harvested for half a year to harvest silver per mu.鲫25-40 kg, with an average body weight of 200 g or more, has a survival rate of 90%, and it does not affect the growth rate and the out-of-water specification of the main fish species.
(3) Adult fish pond polyculture. In the adult fish pond that raises other fish, about 100 fish species are reared per acre of polyculture silver sterling, and raised to the end of the year. Each weighs more than 300 grams; dense production can produce high yields and 300-500 polyculture per acre. Tail scorpion summer flowers, raised to the end of the year, a weight of 150-200 grams, production 50-75 kilograms; multiple sets of breeding is conducive to a balanced listing, that is, the first year of stocking 50 grams of fish weight every year of 100 species, May and June During the period of restocking, 200 fishes were grown in summer. Generally, the weight of fingerlings released in the first nine months of the year was more than 300 grams, and they could be listed on the market successively. Afterwards, it was not until spring energy-saving that there were commercial fish of different specifications, each acre. The output of allogynogenetic crucian carp can reach 50-80 kilograms.
(4) Lake stocking. There is a prominent advantage in the non-segregation of filial piety traits, so it is particularly suitable for stocking in lakes, reservoirs, and small lakes with an area of ​​about 5,000 acres, with a 6.6 cm or more heterogenetic silver locust 50-60 per acre. At the end of the year, 10,000 to 30,000 kilograms of fish can be produced. The practice of production over the years has shown that lakes raising fish have a fast growing, high-yield, and can fully utilize the lake's bait resources. At the same time, the catch rate is high. When it is put into operation that year, it will bear fruit. The fish price is good, and the production efficiency can be improved quickly.
(5) Paddy field cultivation. Use the winter cropping fields, the winter glutinous paddy fields and the low-lying fields in the lake area, where only one season of rice is planted, and carry out appropriate reconstructions, heightening and strengthening the field ridges, and repairing the inlet and outlet and fish trapping equipment. It is possible to plant first-season rice and nested fish species. After the rice matures, it will only receive the ear of rice, and then raise the water level to submerge the rice straw, together with stocking pupa, alfalfa, and silver oysters. As long as we pay attention to strengthening management, we must timely inject water as appropriate, apply appropriate amounts of fertilizer and feed, and prevent fish from being fled. We can develop adult fish and some large-sized fish species.
In addition, there are places and units for polyculture of fish gizzards, polyculture with trout, and the use of river rafts and small pit ponds to raise silver trout.
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