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Survival and Physiological Responses of Red Sea Bream Pagrus major with Decreasing Sea Water Temperature  

Shin, Yun Kyung (South East Sea Fisheries Research Institute, NIFS)
Kim, Young Dae (South East Sea Fisheries Research Institute, NIFS)
Kim, Won Jin (South East Sea Fisheries Research Institute, NIFS)
Publication Information
Korean Journal of Ichthyology / v.30, no.3, 2018 , pp. 131-136 More about this Journal
Abstract
Decrease in seawater temperature during winter is one of the most important and serious issues confronted by fish net-cage aquaculture farms. This can become the cause of the manifestation of diseases and ensuing mass mortality. The present study was conducted to assess the survival rate, the range of limited low-temperature, the response of oxidative stress in the blood of red sea bream Pagrus major with decrease of water temperature. Low-lethal temperature for 7 days of P. major ($7day-LT_{50}$) was $6.54^{\circ}C$ (confidence limit: $6.31{\sim}6.71^{\circ}C$). Oxygen consumption rate was decreased with lower temperature. It showed the minimum value at the range of low-lethal temperature. Osmolality at $5^{\circ}C$ and $6^{\circ}C$ experimental group was higher significantly than control group. SOD (superoxide dismutase) activity was increased significantly at $5^{\circ}C$ experimental group compared to control group. This study data will be used to determine the appropriate area for aquaculture of red sea bream. It also manage fish net-cage farm to cope with the mass mortality occurring frequently during winter season.
Keywords
Pagrus major; low temperature; osmolality; oxidative stress;
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