江苏省赣榆县在今年的河蟹育苗过程中，多数单位在Ｚ_1变Z_2阶段特别困难。许多育苗场Z_1变Z_2过程中几乎全军覆没；有的Ｚ_1变Z_2则需６～７天，变态后的Ｚ_2体质很差，以致育出的蟹苗成活率极低。据笔者观察，这一情况并非Ｚ_1期间投好饵，用药控制就能解决问题的。笔者在育 Ganyu County, Jiangsu Province in this year’s crab nursery process, the majority of units Z_1 change Z_2 phase particularly difficult. Many nursery Z_1 Z2 Z2 process almost annihilated; and some Z_1 change Z_2 takes 6 to 7 days, metamorphosis Z_2 constitution is poor, resulting in a very low survival rate of crab. According to the author’s observation, this situation is not cast during Z_1 bait, medication control can solve the problem. I am educating