First, the conditions of broodstock

The broodfish pond should be selected where there is sufficient water, fresh water, no pollution, convenient irrigation and drainage, close to the spawning pool, strong soil and water retention and fertility, flat terrain, good lighting conditions, and a quiet environment. The pond area is 2-5 acres, and the water depth is 1.5-2.0 meters. The pool shape is regular, the four sides are straight, the east-west direction is smooth, and the bottom of the pool is flat, so it is easy to pull the net.

Second, the choice of broodstock

The broodstock should be selected to have a certain age weight, individual large, healthy, no injury, no deformity, no close relatives of the fish. Commonly selected grass broodstock aged over 4-5 years, weighing more than 5 kilograms: blue broodstock aged 5-6 years old, weighing more than 8 kilograms; broodstock broodstock age 3-4 years old, weighing more than 3 kilograms The broodstock is older than 4-5 years old and weighs more than 6 kilograms.

Third, broodstock stocking and matching

The weight of 250-300 kg of broodstock per acre is appropriate, and the proportion should be determined according to the pond where the main broodstock is raised. Generally, the main pond for raising grass carp is 8 to 10 kg of grass carp per mu, and 20 to 25 tails of grass carp, and 8 to 10 tails of carp or 10 to 12 kg/tail fish of polyculture 6-8 kg/tail. At the end of 5-8, 0.3-0.5 kg / tail of the head of the head 18-20. The pond where the main eel is raised is: 25 to 30 tails of 6-8 kg/tail of carp per mu, 8 to 10 tails of grass carp mixed with 8 to 10 kg of polyculture, and 0.3 to 0.5 kg of tail carp. ~25 tails. The pond that raises the squid: stocks 10 to 12 kg per mu, and 16-20 squid per mu, with mixed-cultivation 8-10 kg/tail grass carp
8-10 tail 0.3-0.5 kg / tail of 17-20 fish. Herring broodstock can be mixed with grasses, clams, and broodstock, and it is advisable to use 2 to 5 tails of mixed herds of 10-15 kilograms per mu. When broodstock is stocked, the proportion of male and female broodstock should be mastered. Generally, the ratio of male to female of the same broodstock can be 1: (1.2 to 1.5). If the number of male broodstock is small, the first few broodstock ponds that have been invented earlier should be allocated to ensure that the broodstock replenishment group is produced when the broodstock is used.

Fourth, feeding and management

1. Feeding management of grass broodstock

After spawning, the broodstock should be fed with concentrate feeds every day before laying into the winter. The daily feeding amount generally accounts for 2% to 5% of the total weight of the broodstock: the amount of green feed is sufficient. After winter, the water temperature of the pond is low, the feeding intensity of the broodstock declines, and the source of green feed is less. The feed can be fed in an appropriate amount. The daily feeding amount should be determined according to the feeding of the broodstock and the water temperature of the pond, etc. Feeding 25-50 grams can be. After the spring, the water temperature of the pond rose, and the feeding intensity of the broodstock increased. In addition to the normal feeding of green feed, each broodstock had to be fed with 50-60 grams of malt or grain buds. Until the oxytocin production, the concentrate could be adjusted according to the fatness of the broodstock. Reduce or not feed. Pond water quality regulation should change according to the season

Seven, water quality and broodstock feeding may be determined, generally low winter water temperature, water injection 1-2 times a month; summer water temperature is high, monthly water injection 2 to 3 times, each time to improve the water level 10 ~ 15 cm is appropriate. In 1 to 2 months before priming, water should be injected 3 to 5 times a month to stimulate the development and maturation of the gonad gonads.

2. Feeding and management of broodstock

Before the broodstock is stocked, sufficient basal fertilizer should be applied. The brooding broodstock should be dominated by human feces, and the broodstock broodstock should be based on livestock feces. Generally, 150-250 kg organic fertilizer should be applied per mu. After stocking, the broodstock should be top-dressed timely according to the season, weather and pond water quality, adhere to the principle of a small number of times, usually top dressing 2 to 3 times a month, each applying organic fertilizer 70-100 kg per acre or inorganic fertilizer 5- 7 kg. After the spring, the broodstock should be fed with sufficient amount of feed before and after entering the winter, the daily feed should be 1% to 2% of the total weight of the broodstock. If the water quality of the pond is converted to fat before October, , can not feed concentrate feed. Pond water quality regulation should be based on the pond's water quality and broodstock maturity, etc., after a broodstock spawns until before spring, water injection to prevent flooding and water quality aging, variable times; after spring, monthly water injection 2 to 3 times, each time to improve the water level 3-5 cm is appropriate. 15 to 20 days before oxytocin production, broodstock broodstock should be frequently filled with water and injected once every 3-5 days; broodstock ponds can be filled with fewer waters, and can be filled once every 7-10 days.

Fifth, fish disease prevention

When the broodstock is used for priming, care should be taken to avoid injury to the fish; care must be given to post-partum broodstock. Before the broodstock is stocked, the broodstock pond should be thoroughly cleaned. After the broodstock is stocked, timely feeding and fertilization should be done, water quality should be adjusted, the weeds of the pond weed should be promptly removed, and the sterilized food table should be regularly cleaned. In the April-September month of the fish disease epidemic season, the grass broodfish ponds will be bleached once a month or twice a day with bleaching powder or quicklime. The broodstock ponds may be treated with 90% crystals such as trichlorfon or bleaching powder. . In addition, we must strictly prevent sick fish and diseased pond water from entering the broodstock pool.

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