河蟹死亡原因及对策近几年来我县河蟹养殖发展较快，养殖面积由原来的几公顷发展到１９９４年的２７３公顷，１９９５年达到４６７公顷多．但养殖单产却由１９９３年每公顷均１０３０．５公斤下降为１９９４年６３９公斤。笔者通过调查了解，河蟹产量下降主要是因为发生批... Causes and Countermeasures of Death in Crabs In recent years, the development of crabs and crabs in our county has been developing rapidly. The area of ​​breeding has increased from a few hectares to 273 hectares in 1994 and reached 467 hectares in 1995. However, the yield per hectare dropped from 1030.5 kg per hectare in 1993 to 639 kg in 1994. I understand through investigation, crab production decline is mainly due to batch ...