Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Starvation Effects on Occurrence of Tunic Softness Syndrome in Sea Squirt Halocynthia roretzi

양식 멍게(Halocynthia roretzi)의 물렁증 발생에 미치는 절식의 영향

  • Kim, Dong Wook (Aquaculture Management Division, Aquaculture Research Institute, National Fisheries Research & Department Institude) ;
  • Park, Jung Jun (Aquaculture Management Division, Aquaculture Research Institute, National Fisheries Research & Department Institude) ;
  • Yang, Sung Jin (Aquaculture Management Division, Aquaculture Research Institute, National Fisheries Research & Department Institude) ;
  • Kim, Chang Hoon (Department of Marine Bio-materials and Aquaculture, Pukyung National University) ;
  • Shin, Yun Kyung (Aquaculture Management Division, Aquaculture Research Institute, National Fisheries Research & Department Institude)
  • 김동욱 (국립수산과학원 전략양식연구소 양식관리과) ;
  • 박정준 (국립수산과학원 전략양식연구소 양식관리과) ;
  • 양성진 (국립수산과학원 전략양식연구소 양식관리과) ;
  • 김창훈 (부경대학교 해양바이오신소재학과) ;
  • 신윤경 (국립수산과학원 전략양식연구소 양식관리과)
  • Received : 2013.03.13
  • Accepted : 2013.10.01
  • Published : 2013.10.31
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Abstract

We examined the effect of starvation on the occurrence of tunic softness to determine the cause of mass mortality of cultured Halocynthia roretzi (Drasche) in the Tongyeong region, Korea. In terms of the survival rate of H. roretzi and the occurrence rate of tunic softness, H. roretzi starved for 35 days at water temperatures of 8, 12, and $15^{\circ}C{\pm}0.5^{\circ}C$ (room temperature of $15^{\circ}C{\pm}1^{\circ}C$) did not exhibit tunic softness at water temperatures of either $8^{\circ}C$ or $12^{\circ}C$. for morphological changes, although the tunic of H. roretzi was shrunken and became visibly smaller with a darkening color in all experimental groups, as compared to the state prior to starvation, its tunics bulbs continuously. The ratio of RNA/DNA concentrations and protein contents for each of the tunic sections were lower in the starved group. Our results indicate that tunic softness is not related to feeding deficiency, as no histopathological symptoms were apparent in the digestive gland or tunic of H. roretzi due to starvation.

Keywords

References

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