수온상승에 따른 북방전복, Haliotis discus hannai 치패의 생존율 및 생리적 변화 (Survival rate and physiological changes of abalone, Haliotis discus hannai juvenile exposed to different high temperature)

서지정보

· 발행기관 : 한국패류학회
· 수록지 정보 : The Korean Journal of Malacology / 33권 / 3호 / 157 ~ 164페이지
· 저자명 : 신윤경, 김영대, 김원진, 박정준

초록

Increase in seawater temperature during summer is one of the most important and serious issues confronted by abalone aquaculture farms, and can become the cause of the manifestation of diseases and ensuing mass mortality. The study was conducted to assess the survival rate, metabolism, changes of hemolymph and histological responses in abalone Haliotis discus hannai juvenile with increase of water temperature. This study will be used to manage abalone farm to cope with frequently the mass mortality occurring during summer season. Survival rate was 100% and falling rate was 0% at 20℃ (control group). But when temperature was elevated to 2 8℃, survival and falling rate was 30% and 70% for 5 exposure period, respectively. And all died after 3 time of exposure at 30℃. Lethal temperature for 5 days of abalone Haliotis discus hannai juvenile (5day-LT50) was 27.9 3℃ (confidence limit: 27.6-28.3℃). Oxygen consumption rate was sharply increased at upper temperature more than median lethal temperature for 5days (5day-LT50). Ammonia nitrogen excretion rate showed the similar tendency with oxygen consumption rate. The change of Glucose, ammonia, total protein in hemolymph was different. Ammonia was increased at median lethal temperature above, but total protein level was significantly reduced more than median lethal temperature. SOD activity was not showed significantly change compared to control group. Pathohistological response was not observed in 23℃ and 26℃ in comparison to control group. However break of hemolymph membrane, segment of fiber aggregate and degeneration were observed at above 28℃.

영어초록

Increase in seawater temperature during summer is one of the most important and serious issues confronted by abalone aquaculture farms, and can become the cause of the manifestation of diseases and ensuing mass mortality. The study was conducted to assess the survival rate, metabolism, changes of hemolymph and histological responses in abalone Haliotis discus hannai juvenile with increase of water temperature. This study will be used to manage abalone farm to cope with frequently the mass mortality occurring during summer season. Survival rate was 100% and falling rate was 0% at 20℃ (control group). But when temperature was elevated to 2 8℃, survival and falling rate was 30% and 70% for 5 exposure period, respectively. And all died after 3 time of exposure at 30℃. Lethal temperature for 5 days of abalone Haliotis discus hannai juvenile (5day-LT50) was 27.9 3℃ (confidence limit: 27.6-28.3℃). Oxygen consumption rate was sharply increased at upper temperature more than median lethal temperature for 5days (5day-LT50). Ammonia nitrogen excretion rate showed the similar tendency with oxygen consumption rate. The change of Glucose, ammonia, total protein in hemolymph was different. Ammonia was increased at median lethal temperature above, but total protein level was significantly reduced more than median lethal temperature. SOD activity was not showed significantly change compared to control group. Pathohistological response was not observed in 23℃ and 26℃ in comparison to control group. However break of hemolymph membrane, segment of fiber aggregate and degeneration were observed at above 28℃.

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