search
for
 About Bioline  All Journals  Testimonials  Membership  News  Donations


Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 37, No. 2, 2016, pp. 90-95
Bioline Code: zr16015
Full paper language: English
Document type: Report
Document available free of charge

Zoological Research, Vol. 37, No. 2, 2016, pp. 90-95

 en Effects of osmotic pressure, temperature and stocking density on survival and sexual reproduction of Craspedacusta sowerbii check for this species in other resources
ZHANG, Yuan-Wei; PAN, Xiao-Fu; WANG, Xiao-Ai; JIANG, Wan-Sheng; LIU, Qian & YANG, Jun-Xing

Abstract

The effects of osmotic pressure, temperature and stocking density on medusae survival of Craspedacusta sowerbii check for this species in other resources 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.

Keywords
Craspedacusta sowerbii; Osmotic pressure; Temperature; Stocking density

 
© Copyright 2016 - Zoological Research
Alternative site location: http://www.zoores.ac.cn/

Home Faq Resources Email Bioline
© Bioline International, 1989 - 2017, Site last up-dated on 05-Dec-2017.
Site created and maintained by the Reference Center on Environmental Information, CRIA, Brazil
System hosted by the Internet Data Center of Rede Nacional de Ensino e Pesquisa, RNP, Brazil