First, when selecting a pond for breeding blackfish, it's important to choose one that isn't too large. A suitable size is generally between 3 to 5 acres. The depth of the pond should be around 1.5 to 2.0 meters, with a bottom thickness of 15 to 20 centimeters. It's also essential to ensure a reliable water source and convenient drainage to maintain good water quality and manage pond conditions effectively.
Second, the fish species selected for stocking should align with market demand. Currently, blackfish with a weight of 0.7 to 2.0 kg are highly sought after. Therefore, fingerlings of about 75 to 100 grams per fish are ideal for stocking. Stocking density depends on factors like feed availability and feeding practices. Typically, 2,000 to 2,500 fish per acre is a common range. Additionally, you can raise 400 to 500 fish per acre with a slightly larger size—around 100 to 150 grams each.
Third, blackfish are carnivorous and will eat both live and dead food. When feeding them artificially, it's important to establish a consistent schedule and train them to come to the feeding area. Feeding twice daily, at 10 a.m. and 3 p.m., helps regulate their eating habits. After 5 to 7 days of regular feeding, the fish should begin to gather near the feeding platform. During feeding, observe closely—if fewer fish are present or the feeding activity slows down, it’s a sign that they are full and you can stop feeding.
Fourth, blackfish have a large appetite and produce a lot of waste, which can quickly enrich the pond water. This can lead to an overgrowth of plankton and potentially cause oxygen depletion. Monitoring dissolved oxygen levels is crucial to avoid such issues. In case of severe hypoxia, you can use a method called "water surface killing," which involves sprinkling worms at a depth of 2 to 3 meters along the pond edge, at a concentration of 0.5 to 1.0 ppm.
Blackfish generally have strong disease resistance and rarely fall ill during normal feeding conditions. However, poor management, inadequate feeding, or unfavorable water conditions in late autumn can still lead to health problems. It's important to remain vigilant during this time and take immediate action if any signs of illness appear.
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