How to raise shrimp well in midsummer

In the high temperature season in midsummer, hot weather, strong light, high water temperature and poor water quality affect the foraging and molting growth of shrimp, which can easily lead to disease and death of shrimp. Farmers should do the following management work well during the high temperature season:

Water temperature control and oxygen regulation should be carried out: with the increase of water temperature and the growth of prawns, the water depth should be continuously increased, especially in the middle and later stages of culture, the water level must be increased to 1.8m~2m, and the high temperature period should be kept above 2.2m. In the period of high temperature, full drainage and full irrigation should be carried out, and the water temperature should be controlled within 30 ℃, so that the transparency of the water can reach 35cm, which is beneficial to the rapid growth, high quality and high yield of shrimp. When changing water, it is best to use a 60-mesh mesh at the inlet to prevent the invasion of tiny organisms containing shrimp fulminant epidemic virus.

Scientific feeding by stages: when the body length of shrimp is more than 4cm, low-value baits such as spiral maggots should be fed with 6 kg per 10 000 tails per day, 50 kg per 10 000 tails per day when the body length is 8cm, and 100kg per 10 000 tails every day when the body length is above 12cm. If this kind of bait is insufficient, it can be fed with compound feed. When the body length of shrimp is more than 4cm, every ten thousand shrimps are fed with 1.5kg formula feed, and when the body length is increased by 0.5cm, it will be increased by 0.3kg and 0.5kg per ten thousand tails every day, and 0.7kg~0.8kg will be added per ten thousand tails every day when the body length is above 10cm. If you feed chilled fish, replace it with 2.5kg chilled fish according to 1kg formula feed. Prawns have the habit of going out at night, frequent activities at night, exuberant appetite; latent during the day, loss of appetite. Therefore, the bait should be fed in two stages before sunrise and after sunset, with 1amp 3 in the morning and 2max 3 in the evening. Bait should be put on the platform around the shrimp pond, so that weak shrimp can also be eaten. When casting bait, we should adhere to "four less, four more" and "two do not cast": that is, less in the early stage and more in the later stage; less in the morning and more in the evening; less in the low tide and more in the spring tide; less in the molting of prawns and more in normal growth; no bad bait, no ring ditch and no deep water. This can effectively improve the feed utilization rate.

Beware of shrimp disease: in high temperature season, the amount of bait should not be too much and too concentrated, lest the bait deteriorate and stink, resulting in water pollution, especially fresh bait, which is easy to deteriorate in high temperature weather, resulting in shrimp poisoning and death. In order to reduce the water pollution of shrimp ponds, the water should be changed frequently. Secondly, attention should be paid to sparse culture and reasonable regulation of shrimp density so that shrimp flocks have a certain space for movement.

Prevent floating head death of prawns: the amount of dissolved oxygen in the pond water drops to the lowest point of the day at midnight and before dawn, when prawns are most prone to floating head death. If the phenomena such as the floating head of prawns and white shrimp and the accumulation of small miscellaneous fish to the edge of the pond are found (these are the signs that prawns begin to float), the aerator must be turned on in time or the water must be changed constantly to increase the dissolved oxygen in the shrimp pond. At ordinary times, attention should be paid to the removal of silt debris in shrimp ponds to ensure that the water quality is fresh and good, so as to prevent the death of shrimp floating head.