Effects of salinity and used medium on the induction of sexual reproduction in the rotifer Brachionus rotundiformis

Title
Effects of salinity and used medium on the induction of sexual reproduction in the rotifer Brachionus rotundiformis
Author(s)
이균우; 최영웅; 이대원; 심소명; 김윤칠
KIOST Author(s)
Lee, Kyun Woo(이균우)Lee, Dae Won(이대원)Kim, Yoon Chil(김윤칠)
Publication Year
2016-05-23
Abstract
This study examined the effect of salinity and medium used on the induction of sexual reproduction for the mass production of the resting eggs in the marine rotifer Brachionus rotundiformis for 9 days. After exposure to various salinities, the mixis rate in all treatments began to increase on the third day and decreased after the 4th or 5th day. The resting eggs appeared on the 4th day at 10‰, 15‰, 20‰, 25‰. In particular, the fertilization rates with 33.3% and 31.3% at 20‰, 25‰ on day 6 were higher than those of the others, respectively. Mean mixis rate for 9 day at 0‰ and 20‰ were the highest with 25.3% and 20.2%, respectively, and the fertilization rate (14.0%) at 25‰ was the highest. In the used medium experiment, the mixis rate in all treatments were similar to the results of the salinity experiment. The resting eggs were only found at 0% and 25% used medium treatments. While there were no significant difference in mean fertilization rate of all treatments, mean mixis rate (22.3%) in 25% treatment was higher than that of the control (0% treatment). As a result, salt stress was more effective than using used medium to induce the sexual reproduction in B. rotundiformis. The optimum salinity was considered to be 20-25‰ which caused a high mixis and fertilization rate in the rotifer. These results provide basic data for the mass production of the rotifer resting eggs.the mixis rate in all treatments began to increase on the third day and decreased after the 4th or 5th day. The resting eggs appeared on the 4th day at 10‰, 15‰, 20‰, 25‰. In particular, the fertilization rates with 33.3% and 31.3% at 20‰, 25‰ on day 6 were higher than those of the others, respectively. Mean mixis rate for 9 day at 0‰ and 20‰ were the highest with 25.3% and 20.2%, respectively, and the fertilization rate (14.0%) at 25‰ was the highest. In the used medium experiment, the mixis rate in all treatments were similar to the results of the salinity experiment. The resting eggs were only found at 0% and 25% used medium treatments. While there were no significant difference in mean fertilization rate of all treatments, mean mixis rate (22.3%) in 25% treatment was higher than that of the control (0% treatment). As a result, salt stress was more effective than using used medium to induce the sexual reproduction in B. rotundiformis. The optimum salinity was considered to be 20-25‰ which caused a high mixis and fertilization rate in the rotifer. These results provide basic data for the mass production of the rotifer resting eggs.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24742
Bibliographic Citation
2016년 한국수산과학회 춘계학술대회, pp.60, 2016
Publisher
한국수산과학회
Type
Conference
Language
English
Publisher
한국수산과학회
Related Researcher
Research Interests

Developmet of Sea Battery Adhesive Biological Reduction System,Blue carbon,해수배터리 해양부착생물 저감장치개발,블루카본

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