In recent years, the risk of crab breeding industry is relatively large and the economic benefits have declined. In order to reduce risks, it is recommended that farmers adopt nesting methods to reduce production risks. Generally, high-quality varieties that can be reared are: squid, stingray, and exotic. Silver oysters, shrimp, etc. The techniques for nesting stingrays are described below. I. Pond conditions In general, ponds suitable for raising crabs can house yellow stings. The conditions of the pond are: sufficient water, fresh water, no pollution, convenient drainage and drainage, and proper planting of plants in the pond (for example, black-leaf algae, bitter grass, etc.) The general planting area accounts for about 30% of the pond area. Another pond should do a good job every year to clear the pond renovation, the first barrier to good disease prevention. Second, the stocking size and density of stingray Stingray's nesting density due to the amount of fish in the bottom of the pond may be determined, the general stocking situation is as follows: the pond breeding V young crab is best to raise more than 2 centimeters of the summer 500 to 600 tails/mu; stocking size of 100 to 200 kg/kg of crab ponds is best to house 100 to 200 kg of stingray 200 to 300 tails/mu. The density of nesting is too high, the specification is too large and it is easy to compete for food, affecting the survival rate of crabs and product specifications; the nesting density is too low and the specification is too small, which affects the survival rate of yellow catfish and does not achieve the purpose of increasing income. Third, the daily management of the daily management of crabs, stingrays mainly responsible for the role of clearing, the general density is reasonable, do not feed alone. It is necessary to adopt the "Four Sets," ie, "Timely, Fixed, Fixed, Quantitative", and at the same time, do a good job of water quality control and create a good ecological environment to meet the growth needs of river crabs and yellow catfish. Due to the susceptibility of hypoxia to stingrays, special attention should be paid to water quality management. Usually, new water should be added in a timely manner to keep the water fresh. In general, from May to June, every 15 to 20 days will be filled with new water once. From July to September, water will be injected every 7 to 10 days, each time adding 10 to 15 centimeters of water. Normal transparency remains around 35 centimeters. IV. Disease prevention and control Disease prevention and control adhere to the principle of "prevention first, and prevention against governing". In summer, the water is usually splashed with lime or a disinfectant such as chlorine dioxide every 20 days. Stingrays are infertile fish and crabs are crustaceans. There are differences in the sensitivity of different drugs. The medication must be careful and the dose must be accurate. It is best to use the medication under the guidance of a technician. The new drug is best used in a small area and then used in large areas to ensure production safety.
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