海蜇幼体与对虾幼体相食关系的实验观察

本文于１９９２年和１９９３年４月下旬至５月上旬，在莱州市对虾育苗增殖场对海蜇幼体与对虾幼体的相食关系进行了实验观察。结果表明：对虾各期幼体均不摄食海蜇各期幼体。海蜇各期幼体摄食对虾各期幼体的能力不同，其中以伞径１０－２０ｍｍ的后期碟状幼体摄食对虾无节幼体和蚤状幼体的比率最高，摄食糠虾幼体和仔虾的比率较低；而伞径２０ｍｍ以上的幼蜇不能吃掉仔虾。文中还对今后合理放流增殖海蜇和对虾资源提出了初步看法。

TESTS ON THE MUTUAL PREDATORY RELATIONSHIP BETWEEN YOUNG MEDUSAE AND PRAWN LARVAE

Tests on the mutuae predatory relationship between young medusae and prawn larvae were conducted in Laizhou municipal Prawn Faim from late April to early May in 1992 and 1993. The results demonstrated that the prawn larvae at all stages didn't prey on the young medusae. The capability of the young medusae to prey on the prawn larvae varied. Naupbius and zoaea of prawn got the most harm, mysis of prawn got less, and the post- larva of prawn got a slight harm. The young medusae with the diameter of umbrella no less than 20mm couldn't prey on the post-larvae of prawn,but could cause death of the post-larvae,suggestion on rational release for reproduction of Rhopilema esculenta and prawn resources was also given in this paper.