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近年来,河蟹养殖洄捕率普遍较低,平均只有40％左右,高的不超过60％,影响了养殖效益。造成河蟹洄捕率低的原因有以
In recent years, the crab farming catch rate is generally low, with an average of only about 40%, high of not more than 60%, affecting the breeding efficiency. The reasons for the low rate of crab-fishing are as follows