At present, the artificial breeding of yellow catfish has attracted the attention and favor of many farmers. Through years of breeding practice, we have confirmed that large-scale fry under-fish ponds can greatly increase the survival rate of stingray aquaculture, and its yield can reach about 400 kilograms per 667 square meters (1 acre), which can achieve better economic benefits. The breeding techniques for stingray fry are summarized below.
Pond conditions
The pond area is 0.2-0.33 hectares, and the water depth is 1-1.2 meters. The water source is abundant, the water quality is good, the drainage and irrigation are convenient, the pond rafts are firm, there is no water leakage, the bottom of the pool is flat, and there is less silt.
2. Clear pond disinfection
The pond is left with 10 to 20 centimeters of water. 80 grams of water is used per 667 square meters of lime. After the lime is solubilized, the hot lime water is poured evenly into the pool. On the second day, the pond mud is turned with a shovel to make the lime slurry and silt. Mix thoroughly to completely destroy the wild fish and harmful organisms, and at the same time allow the dormant plankton eggs in the sludge to emerge from the mud surface to germinate.
3. Water injection and fertilization
After the pond is disinfected, the water injection is started on the third day. The water injection depth is about 70 cm. The water inlet should be filtered with a 40-mesh dense net to prevent the entry of predator organisms. After that, 150 kg of fermented manure or 50 kg of soybean milk should be poured every 667 square meters. Plankton, such as pond water is very fat, with or without fertilizer.
4. Holding or transportation of fry
The fry can be transported using an oxygen bag packed with oxygen. The fry must be kept in the cage for 5-6 hours before transportation to exercise the adaptability of the fry and excrete feces and excrement in the fish to avoid polluting the water during transportation. Well water is the best choice for transportation. In places where there are no conditions, it is also possible to use less organic water. When the water temperature is high, ice can be transported.
5. Fish fry stocking
In order to make the fish fry more palatable baits (rotifers, small horns) after the pond, the seedlings are generally started 8 to 10 days after clear ponds (peak period of rotifers, small horns). When the seedlings are released, they must pay attention to adjusting the temperature difference, and the temperature difference cannot exceed 5°C. Restocking time is best on a sunny morning, and stocking capacity is 40,000 to 50,000 fry per 667 square meters of 0.8 to 1 centimeter long.
6. Daily management
The whole process of fry breeding depends on the natural food. Not only does the fry of the pond require adequate palatability, but it also has abundant palatability feeds at all stages of development. Therefore, whether the natural bait is adequately palatable or not is to raise the fry. key. During the cultivation process, the dietary biomass of the pool should be checked every morning and evening. Usually after 3 to 5 days of feeding the fish in the lower pond, the biomass of the fish in the pond will gradually decrease. At this time, organic fertilizer should be added in time and every 2 days. Once milk, the amount is 10 to 15 kg per 667 square meters, or plankton from other ponds as a supplementary feed, while adding water once every other week, adding about 10 to 20 centimeters of water each time to maintain good water quality, with fry The growth finally added to about 1.2 meters. Fry after 12 to 15 days of feeding, body length up to 3 cm or more, the survival rate of 80% to 90%.
7. Disease prevention and treatment
Stingray has a strong ability to resist diseases, and often maintains a good water quality environment. It is rare to perform routine disinfection and prevention work. Diseases rarely occur. In the prevention and control of disease, the medicines that are allowed by the country to be highly effective, low in toxicity, and have low side effects should be used. . Since stingrays are fish without scales, they are sensitive to trichlorfon, copper sulphate and other drugs and should be carefully selected. It is best not to use such drugs.
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