Several problems that should be paid attention to in raising Liao crab

It is well-known that river crab breeding is optimal for the Yangtze River water system. However, the number of seedlings in the Yangtze River water system is currently limited. For breeding units that are unable to purchase water from the Yangtze River, they can consider the use of Liao crab seedlings. First, the advantages of Liao crab: Although the breeding specifications, recovery rate of Liao crab are less than the Yangtze River crab, but the price of Liao crab seedlings is low, can be more appropriate to increase production. In addition, Liao Crab and Yangtze River Crab can be matured one month ahead of schedule, and it can be listed in advance, winning price advantage and raising well, and still have higher benefits. Second, pay attention to when buying seedlings: 1, select the Liaohe river system features more obvious seed, the current crab seed market mixed fishery, in addition to Liao crab there are still the Yellow River crab, Minjiang crab, etc., these crabs are not as effective as aquaculture Liao crab. 2, try to select the parents of the larger size of the offspring of crab breeding. Big students, small students. This is a natural law, do not think that Liao crab must have grown up. Generally speaking, females grow to 100 grams, and males grow to 150 grams. 3, seedlings should be robust, disease-free and injury-free. Third, the farming process should pay attention to the problem: 1, dig deep crab ditch, and more plants. Liao crab is not afraid of heat and cold, summer water temperature is too high, often caused by stagnation, and the purpose of this measure is to prevent heatstroke. The depth of the crab ditch is preferably 1.8 meters or more, and the water grass coverage is not less than 60%. 2, before the release of crab species must do a good job of anti-escape facilities. Especially during the week of the outsourcing of crab species, the freshman pool, especially the first three days, was not able to adapt to the new environment and escaped severely. The crabs were also low-tolerance to low temperatures, and even if they were released in winter, they escaped. 3, early investment seedlings, early open food, try to buy locally cultivated crabs. Liao crab species should be put early, it is best to change the spring for the winter. In winter and sunny days, it is advisable to cast a bit of bait properly. After spring, the temperature of the water rises above 10°C to eat. The above measures are in place to improve the size and recovery rate of Liao crab. These are determined by the adaptation of Liao crab to a low temperature environment. Conditional self-breeding crabs. Fourth, fattening and fishing: After the migration of Liao Crabs to the south, due to accumulated temperature reasons, as early as the Yangtze River Crab matured within a month or so, both fattening and fishing are advanced. Fertilization is generally started in mid-August and fishing begins in mid-September (if it is a lake or aquaculture, it is recommended to open shop half an month earlier to prevent a reduction in the rate of catch-up. Catching and fattening after recapture). In particular, fishing should be done sooner rather than later to prevent escape and yellowing.

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