1. Shrimp pond conditions Shrimp ponds require sufficient water, fresh water, and rich dissolved oxygen. The shrimp pond area is suitable for 3-5 acres to facilitate stable water quality. The bottom of the sediment is good at the bottom of the mud. The low mud of the pond should not exceed 15 cm, and the water retention depth should be about 1.5 meters. Shrimp consumes more oxygen than fish and has a higher suffocation point than fish. The shrimp ponds should be equipped with aerators or microfluidics to increase dissolved oxygen. Inlet and outlet should be installed anti-escape facilities.
2. The stocking densities of shrimp seedlings are mainly determined by the pond conditions, bait supply, management level and yield indicators. According to the current general situation, the average survival rate of juvenile shrimp to adult shrimp is 40%. If it is planned to produce 100 kg per mu, the shrimp will be released in a pool specification of 20 g/tail, and 3 cm to 10 000 juvenile shrimps per acre will be released. In addition to matching specifications for 50-100 grams / tail squid, squid 150-200 tail. If 0.7-0.8 cm of shrimps are stocked, 2-30000 tails will be stocked per acre, and the catfish can't enter the pool at the same time.
3. Feeding Macrobrachium rosenbergii has a strong selectivity for bait, and it mainly uses animal feeds such as small fish, shrimp, and quail under natural conditions. Therefore, it is necessary to acclimate its eating and eating habits of artificial ingredients in the early stage.
Artificial compound protein content should not be less than 30% -35%. The daily amount of bait is about 5%-7% of the body weight of the shrimp and it can be reduced to 2%-3% in the later period. Feeding 2 times a day, 1/3 of the total number of shots at 8 am, 2/3 of the total number of shots at 5 pm, and it is best to place some animal feeds such as snails and river rafts in places where conditions permit.
4. Water quality management Shrimp pool water quality should be slightly early in the rearing period, moderately thin in the later period, the water color is yellow-green, the transparency is 30-35 cm, the pH value is 7-8, the water depth is 70-80 cm when stocking, and the water level is raised every other week. 10 cm. When encountering poor water quality or hot weather and low atmospheric pressure, it is necessary to add more water and start aerators to increase oxygen. In the hot season, sunny days open the aerator for 2 hours at noon every day to reduce the temperature difference in the water layer and improve the water quality. The aerator of the pond is equipped with an aerator, and the power per acre should reach 0.75 kilowatts, ensuring that the dissolved oxygen in the water is more than 3 milligrams per liter.
5. Planting Concealed material Saplings are planted on the pond slope around the shrimp pond and transplanted to the pond slope 70 cm away from the water level in the middle and late May. The planting distance is 10 cm, and the planting area accounts for 20%-30% of the pond area. It can be used as The good inhabitation and oyster shell environment of Macrobrachium rosenbergii can reduce the mutual killing and increase the survival rate and growth rate. However, the area covered by the water spinach should not be too large, otherwise it will affect the photosynthesis of water in the water and lead to the lack of oxygen in the water body.
6. Macrobrachium rosenbergii is a tropical and subtropical species and has poor adaptability to low temperature. The water temperature below 14°C is difficult to survive. In addition, Macrobrachium rosenbergii has large differences. In order to avoid centralized listing and affect prices, it began to catch in early September. A person with a weight of 20 grams or more was captured, captured and kept small, and went public. After the National Day holiday, when the water temperature dropped below 18°C, the activity of Macrobrachium rosenbergii weakened, feeding decreased, and the growth was slow. The method of catching shrimp is generally to release water first, to pull the net after the pond is half dry, and finally to drain the water. When draining, net bags should be installed at the drain outlet to avoid loss of shrimp.
7. Precautions During the breeding process, the use of trichlorfon is strictly prohibited. Second, the temperature of the water must not be lower than 15°C and not higher than 35°C.
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