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| Effects of High Temperature and Feeding Frequency on Mortality, Growth and Podocysts Reproduction of Scyphozoan Rhopilema esculentum Young Polyps |
| SUN Ming1,2,3, DUAN Yan3, WANG Yaqi4, CHEN Fudi1,2, SUN Jianming1,2 |
1. Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Dalian Key Laboratory of Conservation of Fishery Resources, Liaoning Province, Key Laboratory of Marine Biological Resources and Ecology, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China;
4. Fisheries College, Ocean University of China, Qingdao 266003, China |
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Abstract Combined effects of high temperature (control group of 20 ℃, summer normal temperature, and summer high temperature) and feeding frequency (no feeding, feeding once a week, and feeding once every 2 days) on the mortality, growth and podocyst reproduction of Rhopilema esculentum polyps were studied under control conditions in a lab for 45 d. The results showed that feeding frequency significantly affected the mortality of polyps under high temperature conditions (P<0.05). High temperature, feeding frequency and their interaction significantly affected the relative growth rate (P<0.05). At the end of the experiment, podocysts number produced by polyps was increased with the increase in feeding frequency. There was the most podocyst germinated rate of 34.34% in the group of summer normal temperature and feeding once a week. Feeding frequency had a significant effect on the podocysts number produced by polyps and podocyst germinated rate (P<0.05), while high temperature and their interaction had no significant effects the two indices(P>0.05). The results showed that although the mortality of polyps was high under high temperature, the survival polyps had high production of podocysts. Podocyst reproduction was accelerated with the warming temperature, which may be one of reproduction strategy in response to high temperature. The findings can provide scientific basis for improving the seedling breeding technology of R. esculentum and predicting the R. esculentum medusae yield accurately.
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Received: 19 August 2021
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