Effects of osmotic pressure, temperature and stocking density on survival and sexual reproduction of <em>Craspedacusta sowerbii</em>

Yuan-Wei ZHANG; Xiao-Fu PAN; Xiao-Ai WANG; Wan-Sheng JIANG; Qian LIU; Jun-Xing YANG

doi:10.13918/j.issn.2095-8137.2016.2.90

Volume 37 Issue 2

Mar. 2016

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Zoological Research > 2016 > 37(2): 90-95. > DOI: 10.13918/j.issn.2095-8137.2016.2.90

Yuan-Wei ZHANG, Xiao-Fu PAN, Xiao-Ai WANG, Wan-Sheng JIANG, Qian LIU, Jun-Xing YANG. 2016. Effects of osmotic pressure, temperature and stocking density on survival and sexual reproduction of Craspedacusta sowerbii. Zoological Research, 37(2): 90-95. DOI: 10.13918/j.issn.2095-8137.2016.2.90

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Effects of osmotic pressure, temperature and stocking density on survival and sexual reproduction of Craspedacusta sowerbii

1 State Key Laboratory of Genetic Resources & Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Funds: This study was supported by grants from the Yunnan Province Science and Technology Program, a major program, a innovation plan of science and technology and a seed industry program, the Basic Research Programme of Yunnan Province (2012FB183), the Yunnan Biodiversity Protection Program, a major program of the Chinese Academy of Sciences (Y206B51181), the Yunnan Province Science and Technology Program (2012CA014)

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Corresponding author:
Jun-Xing YANG
Received Date: November 19, 2015
Revised Date: January 09, 2016

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Abstract

Abstract

The effects of osmotic pressure, temperature and stocking density on medusae survival of Craspedacusta sowerbii were examined. The medusae were shown to be sensitive to the variations of osmotic pressure. And the survival time was <90 h at 34 mOsm/L and it declined rapidly with rising osmotic pressure. The peak survival time of >200 h was recorded at 0.2 mOsm/L. Comparing with 27℃ and 32℃ treatments, 23℃ treatment yielded lower activities at a range of 8-13/min. However, there was a longer survival time. A non-linear relationship existed between survival time and stocking density. Lower density resulted in larger body size. And sexual reproduction resumed after breeding for >22 days. Newly-formed polyps and medusae appeared subsequently but only in the higher-density groups of 10, 14 and 18 ind./L. It suggested that the number of newly-formed polyps and medusae was highly dependent on stocking density. That is, a higher stocking density produced more organisms. However, newly-formed medusae died within one month and none grew a diameter of >5 mm.
- Craspedacusta sowerbii,
- Osmotic pressure,
- Temperature,
- Stocking density

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References

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Effects of osmotic pressure, temperature and stocking density on survival and sexual reproduction of Craspedacusta sowerbii