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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 Liao crab's development specifications, recovery rates are less than the Yangtze River crab, but the low price of Liaoning crab seedlings, 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 characteristics of the Liaohe River system more obvious seedlings, the current market dragons and crabs hybrid fish species, in addition to Liao crab outside the Yellow River crab, Minjiang crab, etc., the cultivation of these crabs The effect is not as good as Liao crab. 2. Try to select the offspring that have a larger size of their parents. Big students, small students, this is a natural law, do not think that Liao crab must have grown up, in general, the female grows to 100 grams, the male grows to 150 grams is entirely possible. 3. Seeds are strong, 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 resulting in 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. Be sure to make anti-escape facilities before releasing crabs. In particular, out of the purchased crab species, the week after entering the pool, especially in the first three days, due to not adapting to the new environment, the flight was severe, and the crabs were relatively resistant to low temperatures. Even if they were released in winter, they escaped. 3. Early seedlings and early food, try to buy locally grown 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. General fattening starts from mid-August, and fishing begins in mid-September (if it is a lake or aquaculture, it is recommended to open shop [pre-catch] half an month earlier, in order to prevent a reduction in the rate of catch-up. After recapture, raise and fatten). In particular, fishing should be done sooner rather than later to prevent escape and yellowing.