克氏原螯虾同步化与非同步化育苗效果分析

目的]为不同规模的克氏原螯虾养殖单位提供相应的育苗技术。方法]利用克氏原螯虾秋冬季节生殖需要一定水位的生态习性,采用降低育苗池水位的方法同步化培育苗种,并与非同步化育苗技术的效果进行比较。结果]同步化育苗的苗种规格较小,但能在同一时间内获得规格较整齐的苗种,适合大规模养殖单位同期进苗。非同步化育苗的苗种规格较大,能在夏季养成商品虾提早上市,但无法获得大量规格整齐的苗种,只能分期分批获得不同规格的苗种,适合在不同时期供应小规模的养殖单位。同步化育苗累计出苗尾数、出苗重量和商品虾收获重量分别是非同步化育苗的1.78、0.93、0.80倍。结论]同步化育苗能满足大规模养殖单位的需要;非同步化育苗可以不断收获苗种和商品虾,能满足小规模养殖单位的需要。

Analysis of the Effect of the Synchronization and Asynchronization Young Shrimps-cultivating of Procambarus clarkii

Objective] The technique of young shrimp-raising of Procambarus clarkii was presented through the experiment.Method] According to the habit of Procambarus clarkii needing the water in reproductive period during fall and winter,the effect of the synchronization young shrimp-raising with low water level and asynchronization young shrimp-raising was compared.Results] The young shrimps with same size could be cultured by means of the technique of synchronization young shrimp-raising and the small-sized raising method could provide large amount of young shrimps at same time for large scale aquaculture units.The large-sized young shrimp cultured from the asynchronous raising technique could meet the demand of commercial products for market at early period of summer season,but for large amount of young shrimp with same-sized.Thus,the different sized shrimp products should be cultured according to the plan in time and raising measure for market's need.The number and weight of young shrimp and the weight of commodity shrimps from the technique of synchronization young shrimp-raising were 1.78,0.93 and 0.80 times higher than the technique asynchronization young shrimp-raising,respectively.Conclusion] The technique of synchronization young shrimp-raising could meet the demand of large aquaculture units at same time and the technique of asynchronization young shrimp-raising could meet the demand of small aquaculture units for both commercial shrimp and young shrimp