凡纳滨对虾与全雄性罗非鱼混养试验

【目的】探索新的虾鱼混养模式，避免罗非鱼抢食对虾饵料，达到混养防病、高产增效的目的。【方法】根据凡纳滨对虾与全雄性罗非鱼生物学特性及所摄食饵料沉浮性的区别，在混养池塘中设置圈养圈，通过开、闭通道口，投饵引诱罗非鱼进行阶段性圈养，凡纳滨对虾虾苗放养密度67.5万尾/ha，全雄性罗非鱼（规格6.25 g/尾）放养密度6000万尾/ha，罗非鱼放养前需对其进行咸化，经118 d混养后测定产量，分析养殖效果。【结果】整个养殖过程池塘水质处于相对稳定状态，未发生倒藻现象，也没有发生病害。收获时，凡纳滨对虾平均产量为6212.1 kg/ha，全雄性罗非鱼平均产量为3522.7 kg/ha，综合投入产出比1∶1.52，平均利润75985元/ha。【结论】在池塘中设置圈养圈的虾鱼混养模式是有效可行的。

Pacific white shrimp (Litopenaeus vannamei) and all-male tilapia (Oreochromis niloticus) polyculture

【Objective】In this study， using specifically designed cages， the pacific white shrimp （Litopenaeus vannamei） and all-male tilapia （Oreochromis niloticus） polyculture were studied to avoid competitive feeding in order to prevent disease， increase production yield， and improve benefits. 【Method】According to the differences in biological characteristics of pacific white shrimp and all-male tilapia and their baits’ characters， tilapia bait feeding was temporally controlled by opening and closing of the water passages to avoid tilapia’s excessive consumption of pacific white shrimp. The study was conducted in two 6.67 ha ponds by mixing 67.5×104 post-larvae/ha pacific shrimps and 6.0×107 fingerlings/ha all-male tilapias. The yield was determined by analyzing the culturing effects after 118 days. 【Result】During the polyculturing process， no diseases were detected for pacific white shrimp and all-male tilapia under relative stable water quality. After 118 days， the yield of shrimp and tilapia averaged 6212.1 and 3522.7 kg/ha， respectively； the comprehensive ratio of input to output was 1∶1.52 and the average benefit was 75985 Yuan/ha. 【Conclusion】It is feasible to apply mixed culturing of pacific white shrimp and all-male tilapia in the same pond with the appropriate confinement methed.