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Detailed Explanation of Key Points for Fish Fry Stocking: Do Not Overlook These Critical Points

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For newly built ponds, soak in water for 1~2 days, then disinfect. Old ponds must be drained, thoroughly cleared of sludge and weeds, and treated by tilling, sun exposure, and rinsing to promote the oxidation, decomposition, and removal of organic matter, followed by disinfection. Commonly used disinfectants include quicklime, bleaching powder, and sodium dichloroisocyanurate. The disinfection method generally involves first filling the culture pond with 10~30 cm of water, dissolving the disinfectant in water, and splashing it into the pond. Cement ponds should be rinsed multiple times with the medicated solution, then rinsed with clean water. For example, one enterprise culturing whiteleg shrimp (Litopenaeus vannamei) performs disinfection 15

For newly built ponds, soak in water for 1~2 days, then disinfect. Old ponds must be drained, thoroughly cleared of sludge and weeds, and treated by tilling, sun exposure, and rinsing to promote the oxidation, decomposition, and removal of organic matter, followed by disinfection.

Commonly used disinfectants include quicklime, bleaching powder, and sodium dichloroisocyanurate. The disinfection method generally involves first filling the culture pond with 10~30 cm of water, dissolving the disinfectant in water, and splashing it into the pond. Cement ponds should be rinsed multiple times with the medicated solution, then rinsed with clean water. For example, one enterprise culturing whiteleg shrimp (Litopenaeus vannamei) performs disinfection 15~20 days before fry stocking, fills the pond with 10~30 cm of water, and after dissolving 41 kg/mu of bleaching powder and 8~10 kg/mu of strong chlorine powder in water, splashes the mixture over the pond. After 2 days, drain the pond water, apply 100~150 kg/mu of quicklime by broadcasting over the entire pond, fill with water and soak for 2~3 days, then drain the pond water and refill with 20~30 cm of water, and after soaking tea seed meal, broadcast it over the entire pond together with the residue at a rate of one mu per application.

Applying fertilizer to aquaculture water is an important means of supplementing inorganic nutrients in the water and improving water productivity, but excessive application may deteriorate the water quality of the aquaculture water and pollute the environment, causing eutrophication of natural water bodies. Fertilization is mainly used in pond culture of fish, shrimp, and shellfish, and in the culture of large algae such as kelp and nori. Organic fertilizers should be fermented, decomposed, disinfected, and sterilized before use; untreated organic fertilizers are prohibited, and chemical or biological fertilizers that have not been registered with national or provincial agricultural departments must not be used.

After the aquaculture pond is thoroughly cleared and disinfected, fertilizer can be applied to cultivate plankton. When the pond already has abundant feed organisms and the water quality meets the requirements, you can prepare to stock the fry.

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