Pond rear crab management

To ensure optimal growth and health of disease-resistant river crabs, a well-balanced feeding strategy is essential. The feed should combine fine and coarse materials, with a proper mix of animal and plant-based ingredients. Animal feed sources include small Fish (such as Shrimp), snail meat, insect parts (like cockroach and clam), organ meats, silkworm pupae, and fish meal, which together make up over 70% of the total feed. Plant-based feeds consist of soybean cake, wheat, fruits, and corn. Alternatively, high-protein Crab pellets containing more than 40% protein can also be used. All feed types should be cut into small pieces and placed in shallow water areas covered with aquatic plants to ensure even distribution. The daily feeding amount should be 5–8% of the total crab biomass, divided into two meals per day. It's recommended that the evening meal account for about 70% of the total daily feed. Any leftover food must be removed promptly to avoid water pollution and maintain good water quality. Water quality management is crucial during the later stages of cultivation. The pond depth should be maintained at 1.5 meters or more, with water clarity above 30 cm. Water should be changed every 7–10 days, and the water level should remain stable to prevent crabs from escaping or digging burrows. Every 15 days, 15 grams of lime per square meter should be scattered throughout the pond to increase calcium levels, which is vital for crabs during their molt from yellow crab to green crab. Aquatic plants should cover approximately 50% of the pond surface to provide shelter and improve water quality. Common diseases affecting disease-resistant crabs include ciliate disease, black gill disease, and shell disease. To prevent these, it's recommended to add 0.5 mg of chlorine dioxide per liter of water every 7–10 days. Additionally, antibiotics like terramycin can be mixed into the feed regularly. If ciliate disease is detected, 0.75 kg of carapace net per acre can be sprayed. Dead crabs should be immediately removed, the cause identified, and appropriate treatment applied. Burial of dead crabs is necessary to prevent disease spread. Predators such as water rats, frogs, and snakes must be eliminated quickly to protect the crabs. When water temperatures drop below 10°C, crabs should be harvested promptly to avoid them burrowing into the mud. Methods such as trapping with cages, using light, or water traps can be effective. Once most crabs are caught, the pond can be drained, and the remaining crabs can be collected using nets. This ensures efficient and safe harvesting.

Frozen Swimming Crab

Frozen Swimming Crab,Blue Swimming Crab,Frozen Crab Whole,Portunus Trituberculatus Crab

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