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First, materials and methods
(I) Pond conditions and preparation We chose Hengyang Township, the bank of Dongtai Lake, as the site for the implementation of this test. The water quality in this area is clean and free of industrial pollution. The area of ​​the selected pond is 8.5 mu. It is easy to enter and drain, and the sludge does not exceed 20cm. Water depth is about 1.8m. Thorough clearing of the pond before stocking is done, and the water inlet and outlet are set to block.
(II) Stocking of fish species
1. Winter fish stocks require stocking before the end of January. When stocking, the fish body should be disinfected with 3% saline solution. The stocking capacity per mu is: 250--400 large-scale white bream fish species of 300 species, including 60 pods, 50-100g. One species of 300-year-old white bream fishes, including 60 pods of scapes; 50-100g of one-year-old squid, 95 species of fish; 50g of first-year-old silver oyster species, 400 larvae.
2. The silver oysters of summer cultivars were stocked before the end of June after the amount of pond-loaded fish was reduced. The amount of acre was about 3.0 cm and 3000 flowers were summer.
(three) feeding and management points
1. In the rearing of the summer cruciferous summer flower in the end of June, a small fence was placed in the corner of the pond. The area of ​​the small fence was 1/20 of the pond, and the summer cultivar of the silver oyster was raised in the small fence. Month, to adapt to the pond environment, live rate, temporarily feeding in the small fence net barley, the daily feeding amount of 1.5kg/million, after half a month of about 8cm about the rearing specifications In the pond.
2. Strengthen water quality management, so that early maintenance of shallow water, increase the amount of water in the middle, 7,8,9 March high temperature season to change the water, change the water every 7-10 days, each time changing the water 20-30cm, first row backward.
3. Strengthen feeding management, scientific feeding, and pellet feed, wheat, and cakes, and try not to put in powdered feed during high temperature.
4. Disease prevention management measures are generally adult fish culture.
Second, the test results
1. Flower white pupa production: 151kg/mu.
2. Year-end market output, spent white bream: 155kg/mu; carp: 29kg/mu; adult silver puffer fish: 102kg/mu, average size 341g/tailed; heterotrophic silver carp species: 106kg/mu, average size 52 grams / tail, fish species nest survival rate of 68%, acres are profit 1820 yuan / mu.
Third, summary and discussion
1. Adult fish ponds are reared in different cultures of silver crucian carp and cultivated high-quality large-scale heterotrophic silver carp species, which can provide fish species protection for crucian carp cultures in the following year, so as to increase self-sufficiency and improve survival rate.
2. The amount of fish contained in the pond decreased after the start of catching, and then raising the pond water could be fully utilized to raise the yield per unit area and raise the economic benefits.
3. The key to the raising of large-scale fingerlings of heterotrophic silver crucian carp is that the crucian carp should be kept in a small net in the corner of the rearing pond and the summer flower should be kept in a small net for about half a month. During the period of feeding the barley, etc., it is gradually adapted to the pond water quality environment, so that the survival rate can be greatly improved, so as to obtain satisfactory results.
Heterogenetic silver bream large-sized fingerlings nesting technology
The breeding of large-scale fingerlings of allogynogenetic crucian carp is the basis for high-yield and high-yield culture. For this reason, in 1999, we conducted a nesting experiment on large-scale fingerlings of silver carp, which was a breeding ground for allogynogenetic crucian carp, and obtained satisfactory results.