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. 1. Pond Condition The pond area is 0.2-0.33 hectares, water depth is 1-1.2 meters, water source is sufficient, water quality is good, drainage and irrigation are convenient, the pond is firm, and there is no water leakage. The bottom of the pond is flat and less silt. 2. Clear Pond Disinfectant ponds leave 10 to 20 cm of water, 80 kg of water per 667 square meters of lime, until the lime is solubilized, the lime water is poured evenly into the pool, and the mud is used to turn the pond mud on the second day. Mixing the lime slurry with the silt completely destroys the wild fish and harmful organisms. At the same time, the dormant plankton eggs in the silt are exposed to the mud surface to germinate. 3. After the water injection and fertilization 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, the fermented manure 150 kg or soybean milk should be poured after every 667 square meters. 50 kg, cultivating plankton, such as pond water is very fat, you can use less or no fertilizer. 4. Holding of fry or transportation of fry can be transported by oxygen bag 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. Fry stocking In order to obtain more palatable food (rotifers, small horns) in the rear of the pond, the seedlings generally begin to bloom after 8 to 10 days in the clear pond (reproduction period of rotifers and small cladocerans). . 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 in the morning on a sunny day. The stocking rate is 0.8 to 1 centimeters long and 40,000 to 50,000 fish fry per 667 square meters. 6. The daily management is dependent on natural food in the whole process of fry breeding. The fry need plenty of palatability feeds, and there must be abundant palatability feeds at all stages of development. Therefore, whether or not the natural feed is adequate is the key to raising fry. 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 control Stingray has a strong resistance to diseases, and often maintains a good water quality environment. If routine disinfection and prevention work is carried out, disease will rarely occur. In the prevention and control of diseases, the state shall use high efficiency and low toxicity. Small side effects drugs. 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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