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

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

作者机构：State Key Laboratory of Genetic Resources & Evolution Kunming Institute of Zoology Chinese Academy of Sciences University of Chinese Academy of Sciences 

出 版 物：《Zoological Research》 (动物学研究（英文）)

年 卷 期：2016年第37卷第2期

页      面：90-95页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：supported by grants from the Yunnan Province Science and Technology Program a major program,a innovation plan of science and technology 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) 

主　　题：Craspedacusta sowerbfi Osmotic pressure Temperature Stocking density 

摘      要：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.