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Prevent crab escape
There are several reasons why crabs might escape from their pond. First, when crabs are initially released into a new environment, they often struggle to adapt. This can lead them to crawl around the edges of the pond and eventually escape. To prevent this, it's recommended to acclimate them in a smaller area—about 1 to 2 mu of water surface—for a short period before moving them into the main pond. This helps them adjust gradually to the new conditions.
Second, a lack of sufficient food can cause crabs to become aggressive and even escape in search of better resources. To avoid this, it's important to ensure an adequate food supply. For example, adding 200 kilograms of fresh snails per acre in the spring allows them to breed naturally, providing a continuous food source. During the growing season, feeding should be done twice daily, with the amount being 5% to 10% of the total crab population. The diet should primarily consist of animal-based foods, with some plant-based supplements.
Third, sudden weather changes, especially heavy rain or strong winds, can trigger escapes. To minimize this risk, the water level should be increased before bad weather hits and then lowered back to normal after the storm passes.
Fourth, poor ecological conditions such as low dissolved oxygen, poor water clarity, or insufficient aquatic plants can force crabs to seek better habitats. Maintaining stable water levels, regularly replacing water every 2 to 4 days, and applying lime every 15 days can help improve water quality. It’s also important to keep dissolved oxygen above 4 mg/L, pH between 7.5 and 8, and water clarity between 30 and 40 cm.
Finally, during the reproductive phase, especially when river crabs are migrating, they may attempt to escape. This is more common when there are strong northwest winds or heavy rains around the time of frost. To prevent this, reinforce the pond’s escape-proof barriers and promptly harvest mature crabs. These measures can significantly reduce the chances of crab loss and improve overall pond management.
A soil conditioner is a material added to soil to improve its physical properties, fertility, and overall health. Unlike fertilizers, which primarily provide nutrients to plants, soil conditioners focus on enhancing the soil structure and its ability to retain moisture, aerate roots, and support microbial life. They are typically made from organic or natural materials such as compost, manure, peat, or humic substances, but can also include synthetic options like gypsum or polymers.
The main benefits of soil conditioners include improving soil texture, preventing compaction, increasing water retention in sandy soils, and enhancing drainage in clay soils. They also help balance soil pH, making nutrients more available to plants. Additionally, soil conditioners support beneficial microorganisms that decompose organic matter, recycle nutrients, and promote healthy plant growth.
Overall, soil conditioners are crucial for long-term soil health, ensuring better crop yields, improved plant vitality, and sustainable farming practices. They are used in both agricultural and gardening applications to maintain soil quality and promote optimal growing conditions.