Wheat spring fertilization management guidance
Autumn is an ideal season for raising fish fry, as the temperature of both air and water is more suitable for their growth. To ensure a successful breeding process, there are six important factors to consider.
First, it's essential to thoroughly clean the pond before introducing fry. This includes removing frogs, snakes, fish, shrimp, insects, and harmful bacteria. The cleaning process involves draining the pond and applying lime or bleached powder. For each acre, 60 to 80 kg of lime or 4 to 5 kg of bleached powder dissolved in water should be evenly distributed across the pond.
Second, proper fertilization plays a key role in providing a nutritious environment for the fry. About six days before moving the fry into the pond, fresh water should be added to a depth of 60 cm. Two days later, apply 300 to 400 kg of organic fertilizer per acre. This helps maintain a water transparency of 30 to 35 cm, which is ideal for the fry’s development.
Third, careful stocking is crucial to create a balanced ecosystem. It's common to stock fish fry directly in one go, with approximately 12,000 to 15,000 fry per acre. The ratio of different fish species should be adjusted based on the type of autumn fry. For example, 700 to 8,000 carp fry, 20,000 to 300,000 tilapia, and 30,000 to 44,000 grass carp can be stocked per mu, depending on the specific conditions.
Fourth, feeding must be done scientifically. As the fry grow, their dietary needs change. During the first 15 days, soybean milk (1.5 to 3 kg per acre) should be sprinkled twice daily. After five days, switch to cake flour or wheat bran, using 2 to 4 kg per mu, also twice a day. Once the fry reach over 3 cm, they can start eating duckweed (10 to 20 kg per mu). When they grow beyond 7 cm, increase the feed to 20 to 40 kg per mu. Fry longer than 8 cm can be fed aquatic plants and dried grass. In the absence of peacock mulberry leaves, other plant-based feeds can be used as substitutes, making this method suitable for large-scale fish farming.
Fifth, regular water changes are necessary. Water should be added every three to four days initially, and then every four to five days after that. Each time, add 10 to 20 cm of water. After 20 days, water changes can be spaced out to every 10 days. Always ensure that the new water is clean and free from potential predators or contaminants.
Lastly, disease prevention is vital. Regularly remove weeds and debris from the pond, and keep the feeding area clean. Disinfectants like quicklime or bleached powder should be used daily to maintain a healthy environment. These measures help reduce the risk of diseases and improve overall fry survival rates.
By following these steps carefully, fish farmers can significantly enhance the growth and health of their autumn fry, leading to better yields and more successful harvests.
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