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近年来 ,河蟹育苗成本逐年降低 ,售价随之下降 ,利润趋于平衡 ,因此 ,提高Ｚ1→Ｚ2 ,Ｚ5→Ｍ变态成活率 ,可大大提高蟹苗的产量 ,以获取最大利润。笔者通过近几年在几家育苗场的生产实践 ,就提高Ｚ1→Ｚ2 ,Ｚ5→Ｍ变态成活率的经验总结如下。1 影响蚤状幼体 (Ｚ1→Ｚ2 )变态成
In recent years, the cost of crab nursery decreased year by year, with the consequent decline in selling prices and the balance of profits. Therefore, raising Z1 → Z2, Z5 → M metamorphosis survival rate can greatly increase the production of crab seedlings in order to obtain the maximum profit. The author in recent years in several nursery production practice, to improve Z1 → Z2, Z5 → M metamorphosis survival experience is summarized as follows. 1 affects fleas (Z1 → Z2) metamorphosis into