Eight ways to increase crab efficiency

In recent years, with the continuous growth of the aquaculture industry, more and more farmers have turned to raising crabs in contracted fields. Many have successfully made a good income through crab farming, leading to a booming industry. However, not everyone has been lucky. Some farmers end up losing money instead of gaining profit. So why does this happen? Recently, I visited several crab-farming households and had discussions with them. After analyzing their experiences, we came to a conclusion: to make crab farming profitable, it's essential to improve efficiency and adopt proper technical methods. Here are some key strategies: (a) Fish and crab polyculture. Utilizing large water bodies such as freshwater lakes, rivers, and ponds, farmers can implement a polyculture system that combines crabs with other high-value fish like carp or silver carp. This method maximizes the use of water resources and significantly improves the overall economic return. (b) Self-breeding seedlings. By using pure Yangtze River crabs for breeding and setting up dedicated ponds for raising their own seedlings, farmers can reduce costs and increase survival rates, ensuring better quality stock for commercial purposes. (c) Two-year-old crabs. Raising crabs for two years allows them to reach a marketable size of over 150 grams, which enhances their value and competitiveness in the market. (d) Low-density culture. Stocking between 200 to 500 crabs per acre helps ensure that each crab grows to a larger size by the end of the season, which is more profitable. (e) Aquatic vegetation. Maintaining at least 30% coverage of aquatic plants in the crab pond is crucial. Suitable species include water hyacinth, duckweed, Elodea, and Vallisneria, which help maintain water quality and provide natural habitat for crabs. (f) Snail and mollusk integration. Introducing snails, small crustaceans, and river clams into the pond not only helps purify the water but also provides a natural food source for the crabs, reducing feed costs. (g) Scientific feeding. Young crabs should be fed mainly with animal-based feeds, while adult crabs require more plant-based nutrition. In the later stages, high-quality animal feed should be provided to boost growth and marketability. (h) Comprehensive disease prevention. Maintaining good water quality is essential. Regular disinfection and liming every six months can prevent diseases. It's important to minimize the use of medications and avoid those harmful to crabs. By implementing these practices, farmers can significantly improve their chances of success in the crab farming business.

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