I. Pond selection
Choose ponds with adequate water sources and no pollution sources, drainage and irrigation, and micro-flowing water all year round. The size of the pond is 0.2 hectares to 0.67 hectares, and the water depth is 1.5 meters to 2 meters.
Second, pond disinfection
10 to 15 days before stocking, use 7 kg/667 m2 to 10 kg/667 m2 of bleaching powder to disinfect the pond with water, or use 75 kg/667 square meters of lime to splash the water in the pool. .
Third, fish species stocking
The first season began around the Spring Festival. The grass carp stocks were mainly stocked, and mixed oysters, cockroaches, cockroaches, and squid were mixed. Grass carp 350 g / tail ~ 400 g / tail, stocking density 600 / 667 square meters; carp size 200 g / tail ~ 250 g / tail, stocking density 500 / 667 square meters; carp size 100 g / tail ~ 150g/tail, stocking density 100/667m2; carp size 300g/tail to 400g/tail, stocking density 100/667m2; carp size 150g/tail to 200g/tail, stocking The density is 20/667 square meters to guarantee that all the ponds will be listed before the Dragon Boat Festival. In the second season after the Dragon Boat Festival, all reared grass carp species weighing 150g to 200g were stocked at a stocking density of 600/667m2. After raising to the end of the year, the average tail weight could reach 1.25kg or more. Before stocking, all fish species were soaked in 4% saline solution for 10 to 15 minutes to prevent various bacterial diseases and saprophytic diseases.
Fourth, feed feeding
1. Feed type. Crude protein content of 28% to 30% of grass-fish special sediment feed was used. The particle size of the pellet feed was 2.5 mm at the early stage of cultivation and 3.5 mm at the later stage of the culture. The feed coefficient is 1.6.
2. Automatic feeder installation and use. The machine uses a 220 volt single-phase lighting power supply with a power of 90 watts and a material box volume of 80 kilograms. The feeding area covers 80 square meters. The automatic feeder can be installed next to the pond in the management room, and the power switch is installed in the management room. When you turn on the power switch inside the room during feeding, the automatic feeder can regularly and intermittently spray the pellet feed into the pond in accordance with the set program. Feeding is completed (the feeding time for each meal is set to 1 hour) and the power is turned off automatically. An automatic feeder should be installed in a pond within an area of ​​0.67 hectares.
3. Feeding method. The feeding capacity of fish is closely related to the water temperature. When the water temperature is low, the fish's ability to feed is weak. When the water temperature is high, the fish's ability to feed is strong. Therefore, the pre-breeding quail feeding was calculated as 2%-3% of the total weight of the grass, cockroach and squid in the pond, and changed to 5%-6% in the later period of breeding. In case of hot, cold, heavy rain and other weather may be discretionary reduction. Feed 2 times per quail.
V. Daily management
For high-density intensive production mode, the daily management work is mainly to maintain good and stable water quality, and to focus on preventing hypoxia pan-pooling.
1. Add new water. Adhere to the continuous flow of water at night and night. In case of serious floating head, increase the amount of water.
2. Take an early look at the pond. The frivolous head starts from 5 to 6 o'clock in the morning and disappears when the sun comes out from 7 to 8 o'clock. This is normal. Heavy buoyancy starts at 3 o'clock in the middle of the night. If measures are not taken in time, it will lead to dead fish in the pond at 5-6 o'clock. Therefore, it is necessary to wake up at 3 o'clock in the middle of the night, especially in Xiaomang and Mang. If heavy heads are found, measures such as adding new water and turning on aerators to increase oxygen should be taken in time to prevent flooding.
3. Open the aerator at a proper time. A pond with an area of ​​less than 0.67 hectares can be equipped with a single-phase water jet aerator of 0.75 kW. When the head is light, it can be turned on at 5-6 in the morning to 8-9 when the floating head disappears. In the two seasons of Xiaomang and Mang, in the event of thunderstorms and hot weather, it should be turned on at 12 o'clock in the morning and stopped at 8 to 9 o'clock the next day.
VI. Disease Prevention
Adhere to the principle of "prevention first, prevention emphasis on governance". In the case of patrol ponds, if there is a grass carp cluster at the water inlet and the fish body is black, it is a sign of illness. At this point Quanchiposa 1 mg / l bleaching powder, continuous 2 to 3 days, can stop the disease. During the second season of breeding, it is generally not affected. The main diseases in the first quarter of aquaculture were grass carp "three diseases" and carp hemorrhage.
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