Effect of carbon dioxide and temperature on oxygen consumption of red seabream Pagrus major

Abstract

The oxygen consumption rate (OCR) was significantly affected by temperature (P=0.000), CO2 concentration (P=0.000) and the interaction (P=0.002) of these two variables. The OCR increased significantly with an increase in the temperature range from 15 to 25℃ for all CO2 concentration conditions. Mean OCRs at 15, 20 and 25℃ ranged 76.9~106.4, 83.4~117.6 and 123.6~156.4 mg O2 kg-1 hr-1, respectively. Q10 values ranged 1.15~2.15 between 15 and 20℃, 1.36~2.20 between 20 and 25℃, and 1.47~1.71 between 15 and 25℃, respectively. The OCR relation to CO2 concentration had a unimodal response independent on temperature. The OCR at 750 mg/L of CO2 was highest among all CO2 concentrations for all temperature conditions. The results of this study provide physiological evidence that P. major exposed to various CO2 concentrations and temperatures have significant metabolic response. This result is useful for application of culture management such as water pH level and aeration for optimum growth of P. major.ge from 15 to 25℃ for all CO2 concentration conditions. Mean OCRs at 15, 20 and 25℃ ranged 76.9~106.4, 83.4~117.6 and 123.6~156.4 mg O2 kg-1 hr-1, respectively. Q10 values ranged 1.15~2.15 between 15 and 20℃, 1.36~2.20 between 20 and 25℃, and 1.47~1.71 between 15 and 25℃, respectively. The OCR relation to CO2 concentration had a unimodal response independent on temperature. The OCR at 750 mg/L of CO2 was highest among all CO2 concentrations for all temperature conditions. The results of this study provide physiological evidence that P. major exposed to various CO2 concentrations and temperatures have significant metabolic response. This result is useful for application of culture management such as water pH level and aeration for optimum growth of P. major.