Eight-character Fish Culture Classic is a classic theory in Chinese traditional aquaculture, which involves the regulation of water environment, the feeding of feed, the prevention of fish diseases and so on. In the cultivation of river crabs, the eight-character fish culture has also been widely used. The following will introduce the application of eight-character fish culture in crab culture in detail.

First, adjust the water quality.

Eight-character fish farming emphasizes "raising fish with water and raising big fish with fat water", so it is very important to adjust the water quality when raising crabs. First of all, it is necessary to keep the water quality clear and sufficient, and ensure that the river crabs can get enough water and oxygen. Secondly, biological agents or organic fertilizers can be used to cultivate plankton in water, such as algae and zooplankton, which can provide nutrients and oxygen, which is beneficial to the growth and development of river crabs.

Second, put in feed.

The eight-character fish cultural classics mentioned that "fish are fed by food, and quality and quantity are determined". Therefore, it is very important to put feed reasonably in crab culture. Eriocheir sinensis is an omnivore and needs to eat a variety of foods to meet its nutritional needs. In addition to providing enough natural bait, artificial feed should be reasonably prepared according to the specifications and growth stages of river crabs. At the same time, we should control the quality and quantity of feed to avoid waste and pollution of water quality.

Third, prevent fish diseases.

Eight-character fish farming has always mentioned "prevention first, combining prevention with control", so the prevention of fish diseases in river crab farming is very important. First of all, we should strengthen daily management, regularly check the water quality and the growth of river crabs, find problems in time and take measures. Secondly, some drugs can be used for prevention and treatment. However, it should be noted that drugs harmful to river crabs should not be used, and they should be used in strict accordance with the drug instructions.

Fourth, reasonable intensive care.

It is mentioned in the cultural classics of the eight-character fish that "reasonable close culture, more without disorder", so reasonable close culture is also very important in river crab culture. Reasonable close planting can make full use of water space and resources and improve the yield per unit area. However, it should be noted that reasonable dense culture should be carried out according to the actual situation, and excessive dense culture should not lead to hypoxia and deterioration of water quality.

To sum up, eight-character fish culture has a wide range of applications in river crab culture. By adjusting water quality, feeding feed, preventing fish diseases and reasonable closed culture, the yield and quality of Eriocheir sinensis can be effectively improved, and the breeding benefit can be improved. However, it should be noted that reasonable feeding and management should be carried out according to the actual situation, and blind obedience and abuse should not be allowed.