Winter raising broodstock

Proper allocation of broodstock stocking density is essential for maximizing water body utilization and promoting healthy gonad development. When stocking broodstock in winter, it's important to choose ponds with sufficient water supply, flat bottoms, protection from wind, and good insulation. These ponds should ideally be between 10 to 15 acres in size. In the main broodstock pond, it's recommended to stock 5 to 8 kg of broodstock per acre, with 10 to 15 individuals. This includes 3 to 5 tails of uniform-sized broodstock and 3 to 5 individuals weighing around 10 kg each. For larger ponds, a stocking density of 15 to 20 kg per acre with 10 to 15 fish is suitable, particularly for broodstock with a tail weight of about 10 kg. In grass carp breeding ponds, 8 to 10 kg of grass carp can be stocked per acre, along with 3 to 5 individuals of other broodstock species. A common male-to-female ratio is 1:1.5, though it can be as low as 1:1 in some cases. To ensure the health of overwintering broodstock, dedicated personnel should manage the ponds, conduct regular inspections, and maintain water quality. Water should be added regularly to increase dissolved oxygen levels, prevent leaks, and keep the water level stable. Additionally, water temperature should be monitored and maintained as much as possible. When temperatures remain above 6°C for extended periods, small amounts of finely chopped vegetables or green leaves can be fed to improve the physical condition of the broodstock. For ponds used in raising pufferfish and squid during the winter, fermented manure should be periodically added to help raise water temperature and enhance water quality. These practices contribute to better survival rates and healthier broodstock come spring.

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