Key points of high yield in monoculture of river shrimp in pond

River shrimp, which is widely distributed in rivers, lakes, reservoirs and ponds in China (also known as river shrimp, scientific name Macrobranchium nipponense), is a high-quality freshwater shrimp. Tender meat, delicious taste, rich nutrition, is a high-protein and low-fat aquatic food, quite favored by consumers. So what are the breeding points if you want to achieve high yield by raising river shrimp alone in ponds?

1. Pond conditions

The area is 5-10 mu, the water depth is 0.8-1.5 meters, the ridge is strong and watertight, the slope is 1: (2-3), the bottom is flat and slightly inclined to the outlet, the silt is not more than 20 cm.

2. Prepare before sowing

① medicine pond cleaning: the water is 20 cm 7-10 days before stocking, and the whole pond is evenly sprinkled with 100125kg quicklime per mu for disinfection to remove wild miscellaneous fish and harmful substances; ② aquatic grass cultivation: varieties include verticillium verticillata, yellow silk grass, etc., the planting area accounts for 30-50% of the pond area, water injection fertilization.

3. Water quality management

① uses microbial preparations, such as EM bacteria, photosynthetic bacteria, etc., and biological bacteria are used once every 15 days from late August to early November to improve the pond water environment. ② micropore oxygenation: every 20 mu is equipped with a 3kw microporous aeration pump, each pond has two parallel long-side main pipes, and each mu pond is equipped with 6 disc-type microporous tube discs with a diameter of 1.5m. The dissolved oxygen requirement is more than 5 mg / L. when the dissolved oxygen in the shrimp pond is less than 5 mg / L, turn on the oxygen pump, usually from 12:00 to 16:00 in the afternoon and 24:00 to 6:00 the next morning, on rainy or sultry days.

4. Bait management

In order to feed different specifications of river shrimp full-price formula feed in different periods, supplemented with rice bran and other bait in the early stage. Feed twice a day, accounting for 1p. 3 in the morning and 2 in the afternoon. Adhere to the "four look" (depending on the season, weather, water color, eating activities) and "four fixed" (timing, positioning, qualitative, quantitative). The daily dosage is 3-7% of the body weight of shrimp, the specific feeding amount is 2-3 hours, and the feed coefficient of the whole season is 1.5-1.8.

River shrimp are extremely intolerant to hypoxia, and the temperature is generally lower in the early morning in summer and autumn, especially in the early morning pressure after sultry and thunderstorm weather. Generally, river shrimps are concentrated on the floating head on the edge of the pool. If the medicine is administered at this time, it will not only increase the concentration of the pond water, but also stimulate the river shrimp, so that the river shrimp, which can not bear the hypoxia environment, will suddenly be stimulated by strong drugs and will suffocate to death immediately. That's why you can't take medicine early in the morning. So when is the right time to use the medicine? It is generally appropriate between 10:00 and 4 p.m. During this period, the amount of dissolved oxygen in the pond is relatively high, as long as the medicine is used properly, there will be absolutely no problem. After taking medicine, the activity of river shrimp should be observed in time, and if abnormal is found, clear water can be added.