The newly hatched Aberdeen oysters still have their umbilical cords attached and the yolk sacs are not fully absorbed. It's important to keep them in the hatchery for at least one day before moving them, to ensure they are strong enough and reduce the risk of early mortality. On the first day after hatching, the larvae are placed into plastic pots to begin their feeding process. Each pot is filled with fine sand and 3 cm of water, and approximately 100 larvae are stocked per pot. At 9:00 p.m. each day, four eggs are added as food while also changing the water to maintain cleanliness. After three days of consistent feeding, the oysters typically adapt well to the external environment and are ready to move into the cultivation phase.
There are two main methods of cultivation:
1. **Cement Pond Cultivation**:
Each cement pond should be between 8 to 10 square meters in size, with a depth of 1 meter and a water level of 0.3 meters. The bottom of the pond is covered with 2-3 cm of fine sand, sloped slightly toward the outlet for efficient drainage. Before starting, the pond must be disinfected twice using quicklime or potassium permanganate—approximately 70-80 grams per square meter. Every seven days, feed the oysters with a mixture of algae or young plankton, ensuring that each meal accounts for about 10% of their body weight. The feed can also include 5% fish oil, along with milk powder and vitamins C and E, all mixed with water before being distributed. After six hours, any leftover food should be removed, and the water should be changed to maintain good water quality. Disinfect the pond every 7-10 days with lime or bleach to prevent disease. To provide shade and improve water quality, nylon nets and aquatic plants like water peanuts and fake daffodils are added. After about 30 days of cultivation, the oysters typically reach 10-15 grams and can be transferred to earthen ponds for further growth. The survival rate is generally around 95%, and many grow over 500 grams within the same year, making them ready for market.
2. **Earthen Pond Cultivation**:
The earthen pond should not be too large, ideally around 5 mu (approximately 3,333 square meters). After cleaning and disinfecting using standard methods, a small area of about 200 square meters is enclosed with bamboo poles in one corner. Stocking density is usually 30-50 oysters per square meter, and the feeding and management practices are similar to those used in cement ponds. Since the oysters are more accustomed to natural conditions, they tend to grow faster with lower stocking densities. However, it's crucial to protect them from predators such as water snakes and rats. To do this, remove weeds around the pond and spread lime in a circle around the edges to deter rodents. Another effective method is to install electric wires around the perimeter and energize them at night, which helps prevent rodent attacks. Safety measures must be taken to avoid accidents during this process.
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