Crab breeding has the advantages of less investment, quick effect, and high efficiency. In recent years, many local farmers have raised funds to purchase seedlings. However, due to lack of understanding of science, some farmers have sold the cultivated crabs in the first year without catching them up and cleaning them thoroughly. In the second year, the white seedlings are kept in the pond for feeding, causing large seedlings to be eaten. Seedlings, as a result, failed to grow. For example, a peasant in Wanbei Village, Jiangkou Town, Chongming Island invested 0.25 kg of Yangtze River black seedlings in a 0.6-mu pond in mid-June 1994. In the spring of 1995, it was unacceptable. In the middle of June, 0.5 kg of sunspots were placed in this pond. Seedlings were raised and caught in January this year. However, 12.5 kilograms of crabs were caught. However, there were few crabs left. Loss of several thousand dollars. There are also many examples of these phenomena in Nantong. According to the above analysis, there are two main reasons for the failure of breeding: First, because there is no clear pond, crabs left in the pond will grow to be as long as copper in June of next year. In the middle of June, small crabs will be placed in ponds. Due to the individual differences, after the young seedlings were shelled, the soft shell crabs could not escape from the crabs. The second reason is that farmers are afraid that crabs are precocious and they usually control feeding and some do not even feed bait. The large seedlings remaining in the pond are in a prolonged period of gluttony. Due to starvation, they have to desperately eat soft shell crabs. As time goes by, the crabs in the pond are bound to run out, resulting in a serious loss of cultivation. In order to avoid the occurrence of similar phenomena, this reminds the majority of new and old people to raise...
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