Fry cultivation can be carried out using various methods such as nursery equipment, cement pools, cages, or ponds. Among these, pond-based fry rearing is a common and effective approach. When using ponds for fry production, the typical size ranges from 3/15 to 5/15 hectares, with a water depth of approximately 0.6 meters. One month before stocking the fry, the pond should be thoroughly cleaned and disinfected. After the disinfectant has lost its effectiveness, the water level should be raised to about 30 centimeters. At this stage, fertilizers are added to the water to promote the growth of zooplankton, which serves as natural feed for the fry.
Once the fry are introduced into the pond, the water level should be gradually increased by 5 to 10 centimeters every few days until it reaches a depth of 60 centimeters. Within 20 to 30 days, the fry will grow to a size of 0.8 to 1 cm, at which point they are ready to be transferred to the summer feeding stage.
For the summer feeding phase, the pond size is more flexible and not strictly limited. Before stocking, the pond is treated with lime to clean and disinfect it, followed by proper fertilization of the water. The stocking density typically ranges between 900,000 to 1.2 million fry per hectare. Initially, the water depth is kept at around 0.5 meters and is gradually increased as the fish grow, reaching up to 1.2 meters by the end of the growing period.
From the second day after stocking, two feedings per day are provided. In the first week, soy milk is used as a primary feed, and then it is gradually replaced with compound feed. With proper care and nutrition, the fry can reach a size of 7 to 10 cm within about 40 days. This method ensures healthy growth and prepares the fish for further development in larger ponds or tanks.
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