In the middle and later stages of prawn ponds after 7-8 cm in body length, due to the increase of feeding amount, the gradual accumulation of shrimp excrement, together with the death of algae, as well as the combined effects of residual baits and organic decomposition of bottom pools, makes pond water quality, bottom There have been great changes in quality, microbes, etc.
The specific changes in the water environment and shrimps in the middle and later stages of shrimp farming are: the pH value gradually increases, the water color changes from greenish green, yellowish green to brown, tea green, the transparency is reduced, and the turbidity increases; the bottom of the pond is black and has a bad smell. The number and types of harmful microorganisms increased; shrimp tails and tentacles became red, and even tails and cuts were observed. Some shrimp ponds exhibited slow growth, weak physique, poor sensitivity, no shelling, ciliate parasitism, and no eating. Wang, there are enteritis, jaundice; more parts of the shrimp pond shrimp swim, floating head, soft shell, red legs, rotten eyes, carapace ulcers and other symptoms. Based on the experience of breeding prawn for many years, the author summarized the management points in the middle and later stages of shrimp aquaculture.
Stabilize water and reduce water turbidity. The reason for the change of pond water color in the middle and later stages of shrimp aquaculture is mainly due to the lack of magnesium ions required for the propagation of green algae. Spilled dolomite 20-2510-6, use once every 7-10 days to stabilize the color. In order to reduce the turbidity of the water, photosynthetic bacteria 10-1510-6 were used. The whole pond was splashed and used once every 7 days. At the same time, adhere to regular disinfection of aquaculture water, disinfection of the whole pool every 10-15 days 2 times. For the first time, dibutyl hydantoin disinfectant Quanchiposa was used in the morning at the therapeutic concentration, and the second day was followed by organic iodine and quaternary ammonium salt 0.210–6 Quanchiposa the next morning. When appropriate, the disinfectant concentration can be increased.
The balance of nutrients in the aquaculture water environment is adjusted to supplement the contents of calcium, magnesium and phosphorus in the water body. For every 10-15 days, Quanchiposa spilled 2-310-6 dicalcium phosphate 1 time, and 2010-6 dolomite powder once.
Improve the pond sediment environment and control the pH. Every 10-15 days, sprinkling one beneficial microbial preparation 0.310-6 once, or spilling zeolite modifier as the main raw material's bottom quality improver once every 5 days, each dosage is 10-1510-6, if it suddenly drops heavy rain or persists. If the pH value is lowered to 7.5 or less due to cloudy weather, then the whole pool will be splashed with 5-8 kg of lime per 667 square meters.
Reasonably add water and change water. The amount of water changed on the first day is controlled at about 10 cm, and on the second day, the third day, and the fourth day, the water changing amount can be gradually increased to 20 cm, 30 cm, and 50 cm. In this way, both water quality and shrimp growth can be promoted. For the shortage of water level, we must deepen the water level in time and purchase oxygen-increasing equipment in order to increase the aquaculture production and scale. Facts have proved that the higher the shrimp aquaculture production, the larger the specifications, the more obvious the economic benefits.
Reasonable feeding, reduce the bait coefficient. It is usually fed 4 times daily. The time for feeding in the morning must be set at 1-2 hours after the sun rises. It is best when the dissolved oxygen in the water reaches more than 4 milligrams per liter. After 6 hours, they are fed once. To control the amount of feed, it is usually appropriate for shrimp to eat the feed within 45 minutes to 1 hour.
Improve shrimp immunity and anti-stress ability. Add in the feed: immune polysaccharide 1 ‰, biological enzyme activity additives 2 ‰, vitamin C1 ‰-2 ‰, vitamin B10.5 ‰, fed 2 days a week, fed 2 meals a day; high temperature season to add allicin 0.5 ‰- 1‰.
Check the shrimp health regularly. If shrimps are found to eat less food or diseased shrimp floats head-on, the shrimp disease infection rate in shrimp ponds has reached more than 20%. Therefore, it is necessary to promptly adopt therapeutic measures to find diseased shrimp that have been infected but are eating normally and are not floating aside. During the middle and later stages of shrimp rearing, it is generally necessary to randomly sample 200-300 prawns around the pond every 3-5 days with a net of a denser mesh to see if it is normal. In the case of sudden increase or decrease of feed in shrimp, when the climate abruptly changes during the following periods of heavy rain and windy winds, in the case of shrimp disease that can be induced after water intake or water exchange, it is necessary to use a rotary screen for sampling as soon as possible.

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