1. Seed cultivation
1) The area of ​​ponds for raising fish fry in ponds is preferably 2 to 3 mu. The floret clearing and detoxification should be carried out 8 to 10 days before heterotrophic silver carp seedlings in the lower pond. Fertilizer water quality will enable the fish to obtain sufficient food after going down the pond.
Freshly laid fish fry rely on the yolk sac of the yolk for nutrition. After 3 days, the yolk disappeared, the worms inflated, and they could swim and eat. At this time, the egg yolk could be fed. After feeding, the egg yolks ingested by the fry can be seen in the intestine. After two days of feeding, the fry's ability to feed and swim is enhanced and the pond can be cultivated. Since the various organs of the fishery in the pond had not yet been fully developed and had poor activity, it was necessary to strengthen the management of the flowering pond during the fry period of the fry, and to maintain appropriate water quality and rich food, which was the healthy growth of the fry. Very important.
The breeding method for allogynogenetic crucian carp seedlings is the same as the cultivation method for carp seedlings. The density of fry in the floret is preferably 100,000 to 150,000 tails per acre. Within a few days under the fry, feed the soybean milk twice a day. Use 3 to 4 kilograms of soybeans per acre per day. Afterwards, look at the shade of water and the growth of the fry and increase or decrease as appropriate. After 15 days of cultivation, the silver crucian carp grows into 1.6-2.5 cm summer flowers. At this point, the summer flowers can be nested in the fish fingerling pool. However, if cultivar cultivar 6.6 cm or more in size is to be cultivated, it will be necessary to carry out summer flower demarcation, generally 20,000 to 30,000 cultivars of silver cultivar will be reared in each acre, and 6.6 cm or more in 20 to 30 days. Fish species.
2) Paddy field cultivation Paddy field cultivation of fish fingerlings is an effective way to save fish ponds, feed, and feed. Each mus of rice field water surface 50,000 sterling silver bream water, 20 to 25 days of cultivation, can grow into 1.6 ~ 2.5 cm of summer fish species. If you continue to raise rice in the paddy field, put 1,000 to 1,500 summer fish species per acre, and further develop large-sized heterotrophic silver carp species with a size of 6.6 cm or more.
2. Adult fish culture
In the rearing method of adult rearing silver cockroaches, it is most economical to set up a pond. The pond cultivating is further divided into fish breeding pools and adult fish ponds.
1) When the fish pool is raised in the fingerling pool and the fish pool is set, 80-120 tails of 5-7 centimeters of summer fish are placed per acre of the fingerlings. Generally, there is no need to increase the feeding amount of the feed and no special feeding is required. management. After more than 5 months of breeding, the average individual can reach more than 250 grams, and 20-25 kilograms of adult fish can be obtained per acre.
2) Adult fish ponds can be divided into two types in the raising of fish ponds. One is that the flower scorpions, white plover and squid are the main fishes, and the smaller one is bred with silver oysters; The main fish, suitable for stocking flower peony, white bream, squid and so on. Both of these nesting methods work well.
3) Rice field farming The stocking capacity of crucian carp in paddy fields depends on the water depth and the biological conditions of the feed. Under normal circumstances, the rearing and rearing of silver oysters per mu is about 1,000, and the yield per mu is up to 40-50 kg.
4) The ditch-harvested harbor is generally a closed or semi-enclosed large-scale water body, which can ensure the rate of catch-up. The bait is rich in resources and has intensive cultivation conditions. Heterologous silver carp stocking can be based on the size of the area and the abundance of water bodies. Generally, 50-300 species of summer fish can be planted in Mu, which can grow to 200-400 grams on average at the end of the year.
5) Lakes for stocking and raising fishes The density of stocking in lakes and lakes varies greatly. When there are few ground fish such as squid and squid in the small lakes, they can be stocked (with a size of 6.6 cm or more) from 40 to 50 liter. Hundreds of tails.
6) Culture of cage cultures Culticulture of silver oyster cages is easy to manage, with high yields and commodity rates. The amount of stocking should be 100-500 per square meter (about 6.6 cm in size). After 7 months of feeding, the maximum weight was 0.75 kg and the average weight was 350 g or more. The cages produce 7.2 kilograms of fish per square meter and the feed ratio is 1.2-1.4.
7) Fish-breeding mixed-breeding river-breeding cultured pearl broodstock reared with heterotrophic silver cocoons will neither affect the growth and pearl yield of the river eel, but may also receive hundreds of kilograms of commercially-available cocoon-sterilized merchandise and increase economic income. Under normal circumstances, 500-600 mu in stocking and 500-600 in stocking, and rearing 5 to 6 months of raising, the average mu yield of silver trout can reach about 250 kg.
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