Manage water quality and quality
In aquaculture, water is the most basic and most important factor. It determines water quality conditions and the success or failure of breeding. The general water source conditions require stable, adequate, clean, sanitary, and suitable water temperature, good water quality, and no pollution. It is in line with the national fishery water quality standards. It also requires convenient injection and drainage, and single-row single injection. In the injection and drainage outlets, a fishing tackle net should be constructed to prevent enemy organisms and wild fish from entering the pool and prevent the escape of various cultured species. The probability of flooding in the summer is relatively large. Therefore, it is necessary to manage the intake and drain outlets well, and do a good job in the construction of filtration facilities to ensure that drainage and irrigation are free and the embankments are not easily destroyed.
Rational fertilization to cultivate water quality
The amount of fertilizer affects the growth of shrimp, but also affects the change in water quality. When breeding, it is also possible to moderately fatten the plankton in a good state of growth, increase dissolved oxygen and nutrients in the water, and cultivate good water conditions to assist the growth of cultured species. The basic principle is to apply organic fertilizers, control inorganic fertilizers, and not apply fertilizers. Under normal circumstances, according to water quality control, from May to June in the application of organic fertilizer, every 7 days -10 days once: July-September to fertilizer-based, fertilization once every 4 days -6 days. For ponds such as cultured lobsters, they should be fertilized according to the water quality of the pool and weather conditions. Generally, the transparency of water quality should be about 30 cm to 40 cm. At the same time pay attention to a fertilization amount should not be too much, with 8 kg of water per acre of ammonia -10 kg, the use of ammonia, the application of river mud and water dilution, the ratio of 1:10:50 mixed Quanchiposa, can also be based on water temperature, Application of water quality to biological fertilizers, including EM bacteria, photosynthetic bacteria, etc., to maintain good water quality.
Scientific feeding stable water quality
In the summer, crayfish grows most vigorously, feed inputs are relatively large, and they have a great impact on water quality. The principle of scientific feeding should be grasped to stabilize water quality so as to avoid harm. Feeding should be based on the weather, water quality and feeding conditions. The weather is fine, the water quality is fresh, and when the food is in high demand, it is appropriate to vote more; otherwise, it is less or not as appropriate. In early spring season, feeds with high protein content (river crabs) are usually fed, and some live fish are properly matched. The concentrates are eaten within 2 hours of feeding. Normal feeds are fed twice a day. Every time, they are fed from 9am to 10am and from 5pm to 6pm. Some bran, corn and aquatic plants can also be thrown at the same time. It is necessary to strictly control the feeding and night feeding of crayfish floating heads in the morning to avoid causing diseases. The concentrate feed requires nutrition to be comprehensive and sufficient, and it is advisable to use full-priced feeds produced by regular manufacturers; fresh fish, screws, shellfish are required to be suitable for taste, non-toxic and harmless, avoid feeding moldy feed, and pay attention to coarseness in feed varieties. Collocation. ,
Regularly adjust water quality
In summer, the water temperature is high, the water quality changes rapidly, and the amount of fertilizers used for feeding is relatively large. The excretion of various cultured species is large and the water quality is easily contaminated. Therefore, water quality regulation should be strengthened. The following adjustment methods are commonly used.
Regular filling of fresh water Regular water injection is one of the most commonly used and most economical methods for regulating water quality. Usually, fresh water is added every 7 days to 10 days, and water is added 1/3 each time. In the event of serious deterioration of the pool water, water changes should be taken to maintain good water quality. The pond should be kept as high as possible throughout the summer.
The use of aerators for intensive culture of ponds should be equipped with special aerators. Normally, oxygen is turned on at 2 to 3 pm on a sunny day, and oxygen may be turned on when there is danger of floating heads.
Drugs regulate water quality Lime can be used to regulate water quality on a regular basis. Generally, once every 20 days, about 10 kg of lime per acre and about 15 kg of aquapure of water are sprayed once. It can also increase the content of free calcium in the water and help the crayfish to unshell.
Strict prevention of hypoxia should promptly remove residual baits and dirt from the pond or feed table to prevent water pollution. When the floating head occurs in the pond, oxygenation agents and other related drugs may be used to increase oxygen.
Water catching and controlling water quality In summer, with the rapid growth of crayfish and other cultured species, the volume of cargo carried by ponds has risen sharply, and the probability of water quality deterioration has become greater. At this time, attention has been paid to catching the water, releasing water space, and controlling the water body. Cargo volume, to control the quality of water, prevention and the role of the unexpected. Because various species grow faster in the summer, they should do a good job of catching, catching large and small, and getting a balanced listing.
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