순환여과양식시스템에서 감성돔(Acanthopagrus schlegelii) 치어의 성장에 미치는 수온의 영향
Effects of Water Temperature on the Growth Performance of Juvenile Black Sea Bream Acanthopagrus schlegelii in a Recirculating Aquaculture System
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This study aimed to identify the optimal rearing temperature for juvenile black sea bream Acanthopagrus schlegelii in a recirculating aquaculture system (RAS). Juvenile fish were reared at 6 water temperatures (20–35°C) for eight weeks, and growth performance, feed conversion ratio (FCR), survival rate, daily feed intake, and thermal growth coefficient (TGC) were evaluated. Power consumption and associated temperature regulation costs were also analyzed. Maximum growth rate and final body weight were recorded at 29°C; however, comparable somatic growth with enhanced survivability was achieved at 26 °C. TGC, a temperature-dependent index of relative growth, was highest at 23°C, indicating optimal physiological growth efficiency. In contrast, absolute growth and reduced culture duration was most favorable at 29°C. These findings highlight the complex interaction between water temperature and growth dynamics. Furthermore, energy expenditure per unit biomass gain was lowest at 26°C, indicating optimal energetic cost-efficiency. Collectively, the 26–29°C range was identified as optimal for sustaining growth performance and operational cost-efficiency. In conclusion, 26°C is recommended as the economically optimal rearing temperature for juvenile A. schlegelii in RAS, balancing growth stability with minimized energy input.
Abstract
This study aimed to identify the optimal rearing temperature for juvenile black sea bream Acanthopagrus schlegelii in a recirculating aquaculture system (RAS). Juvenile fish were reared at 6 water temperatures (20–35°C) for eight weeks, and growth performance, feed conversion ratio (FCR), survival rate, daily feed intake, and thermal growth coefficient (TGC) were evaluated. Power consumption and associated temperature regulation costs were also analyzed. Maximum growth rate and final body weight were recorded at 29°C; however, comparable somatic growth with enhanced survivability was achieved at 26 °C. TGC, a temperature-dependent index of relative growth, was highest at 23°C, indicating optimal physiological growth efficiency. In contrast, absolute growth and reduced culture duration was most favorable at 29°C. These findings highlight the complex interaction between water temperature and growth dynamics. Furthermore, energy expenditure per unit biomass gain was lowest at 26°C, indicating optimal energetic cost-efficiency. Collectively, the 26–29°C range was identified as optimal for sustaining growth performance and operational cost-efficiency. In conclusion, 26°C is recommended as the economically optimal rearing temperature for juvenile A. schlegelii in RAS, balancing growth stability with minimized energy input.