First, preparation before investment seedlings
The new pond was soaked in water for 1-2 days and then sterilized. After the old ponds must be drained, the sludge and weeds should be completely removed, and ploughing and rinsing should be used to promote the oxidation, decomposition, and elimination of organic matter, and finally be disinfected.
Common disinfectants include quicklime, bleach, and sodium dichloroisocyanurate. The disinfection method is generally to fill the culture pond with water of 10-30 cm. The disinfectant is dissolved in water and then poured into the pool. The cement pool is rinsed with water several times before flushing with fresh water. For example, if a farmer sterilizes Penaeus vannamei in 15-20 days prior to planting, the pond is filled with water at 10-30 cm, and the pond is splashed with bleaching powder (41 kg/mu) and strong chlorine (8-10 kg/mu). After 2 days drain the pool water, use quicklime 100 to 150 kg/mu, splash the entire pond, soak in the water for 2 to 3 days, then drain the pool water and then inhale 20 to 30 centimeters. Pool spilled.
The application of fertilizers in aquaculture waters is an important means to supplement inorganic nutrients in water bodies and increase the productivity of water bodies. However, over-application of fertilizers may deteriorate the water quality of aquaculture waters and pollute the environment, resulting in eutrophication of natural water bodies. Fertilization is mainly used for pond culture of fish and shrimps. The use of organic fertilizers should be treated by fermentation, decomposing, disinfecting, and sterilizing. It is forbidden to use untreated organic fertilizers and chemical or biological fertilizers that have not been registered by the national or provincial agricultural department.
After the ponds have been thoroughly cleared and sterilized, plankton can be fertilized and cultivated. When the pond is rich in food organisms and the water quality meets the requirements, it can be ready for planting.
Second, seed purchase and stocking
Seedlings should be purchased by the Miao enterprise with strong technical force, good reputation, and production license for aquatic products. They should purchase the original high-quality seed breeders and ask for the quarantine certificates and invoices of this batch.
The quality of the seed is easy to identify:
The first look at seed body color, normal body color, shiny seed quality is good;
The second is to see the seed swimming, the seed is lively, the swimming is powerful, and has a certain anti-countercurrent ability, it is a good seedling;
Third, see the seed body surface, complete body surface, no incomplete, no damage, no inflammation, it is a good seedling;
The fourth is to see the uniformity of seed size, small individual differences in seedlings, and uniform quality.
After purchasing seedlings, they should be transported in the evening or in the early morning and put into a culture pond for raising the transparency of the pool water to the requirements of the breeding object. The time, method, density, and seedling management of the seedlings should be suitable for the culture conditions and aquaculture capacity of different ponds. During the holding period of seedlings, the daily work management such as feed feeding, water quality monitoring, water exchange treatment, disease prevention and treatment, records of ecological conditions of seedlings, use and maintenance of aquaculture facilities shall be performed.
Before the official release of seedlings, the aquaculture water body and sediment must be tested. The seedlings have to be adapted to the local environment after being raised. The ecological condition is good, the size is relatively uniform, and the growth rate is close.
Miaomiao should be carried out in the morning or evening on a sunny day. Sun exposure and rainy days at noon should not be allowed to plant seedlings.
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