Three tracking surveys were conducted in 2013 after the releasing of Chinese shrime Fenneropenaeus chinensis to the nature waters of Wuleidao Bay .The results were compared to find out the releasing effect of different sizes of juveniles on its stock in Wuleidao Bay .It showed that the releasing juveniles strongly enhanced the recruitment of the nature stock due to the obviously increment of biomass in the bay of Wuleidao .The phase survival rate and contribution rate of larger Chinese shrimp were 2—3 times and 2—4 times higher than the smaller ones ,respectively .Before the middle of August ,there were significant differences in body length between larger and smaller shrimp .In late August ,released smaller ones had the size close to larger ones ,both showed basically synchronous growth .However ,there was differences in somatic features between larger and smaller ones . The larger shrimps were superior to smaller ones in condition factors .%根据2013年在五垒岛湾进行的中国明对虾放流前的本底资源调查及放流后3个航次的跟踪调查结果 ,对比分析中国明对虾大、小规格苗种各自的增殖放流效果.研究结果表明 ,增殖放流后五垒岛湾中国明对虾资源量明显增大 ,放流入海的虾苗对五垒岛湾中国明对虾资源起到了明显的补充作用.大规格苗种的阶段成活率和放流群体贡献率明显大于小规格苗种 ,分别为小规格苗种的2~3倍和2~4倍.8月中旬以前 ,大、小规格苗种存在明显的体长差异性 ,8月下旬以后 ,小规格苗种体长与大规格苗种接近 ,两者基本能实现同步生长 ,但大、小规格苗种仍然存在一定的体征差异 ,大规格苗种的肥满度相对较高 ,体征状况要优于小规格苗种.
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