Survival rate and physiological changes of abalone, Haliotis discus hannai juvenile exposed to different high temperature
Yun Kyung Shin, Young Dae Kim, Won Jin Kim and Jung Jun Park
South East Sea Fisheries Research Institute, NIFS, Tongyeong 39769, Republic of Korea South Sea Fisheries Research Institute, NIFS, Yeosu 59780, Republic of Korea
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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