지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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This study analyzed the occurrence of tunic softness, survival rate, metabolic rate and histopathologic changes arising from the effect of hypoxic environment in order to find the causes of occurrences of tunic softness, which manifests as the key phenomenon of mass mortality of Halocynthia roretzi. Regarding the survival of H. roretzi with reduction in dissolved oxygen, all the entities died on the 4th day of exposure to the dissolved oxygen concentration of 2 mg L‑¹ while 50% mortality was observed on the 5th day of exposure to the dissolved oxygen concentration of 3mg L‑¹. Therefore the 5 days-LC50 was found to be 3.55 mg L‑¹ (1.86~4.96 mg L‑¹). However,occurrence of tunic softness was not observed during the period of exposure to low oxygen concentration.
The oxygen consumption rate significantly decreases at the dissolved oxygen concentration of less than 5 mg L‑¹ in comparison to the control group. Therefore, it is presumed that H.
roretzi controls the respiration rate for prescribed period of time when exposed to hypoxic environment. Regarding the histopathologic changes in the gill, digestive gland and cyst of H.
roretzi due to hypoxic environment, necrosis of epithelial layer, in filtration of blood cells, and condensation of nucleus that compose each of the organs were observed. Regarding morphological changes, the decrease in volume with shrinking of the tunic, discoloration of the internal organs and necrosis of gill and hepatopancreas were observed.
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참고문헌 (24)
참고문헌 신청
[학술지(정기간행물)]
Aquacop EB / 1988 / Effects of dissolved oxygen concentration on survival and growth of Penaeus vannamei and Penaeus stylirostris / J. World Aquacult. Soc 19 : 12A ~
Armsworthy SL / 2001 / Feeding activity, absorption efficiency and suspension feeding processes in the ascidian, Halocynthia pyriformis (Stolodobranchia: Ascidiacea): respons
Bayne BL / 1983 / Physiological energetics of marine molluscs. In the mollusca, Vol. 4 / Academic Press : 407 ~ 515
Bayne BL. / 1973 / The responses of three species of bivalve mollusc to declining oxygen tension at reduced salinity / Comp. Biochem. Physiol 45A : 793 ~ 806
Aquacop EB / 1988 / Effects of dissolved oxygen concentration on survival and growth of Penaeus vannamei and Penaeus stylirostris / J. World Aquacult. Soc 19 : 12A ~
Armsworthy SL / 2001 / Feeding activity, absorption efficiency and suspension feeding processes in the ascidian, Halocynthia pyriformis (Stolodobranchia: Ascidiacea): respons
Bayne BL / 1983 / Physiological energetics of marine molluscs. In the mollusca, Vol. 4 / Academic Press : 407 ~ 515
Bayne BL. / 1973 / The responses of three species of bivalve mollusc to declining oxygen tension at reduced salinity / Comp. Biochem. Physiol 45A : 793 ~ 806
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