수온, 광조건 및 밀도에 따른 자바리E(pinephelus bruneus)의 산소소비 특성
Effects of Water Temperature, Photoperiod and Population Density on Oxygen Consumption in the Longtooth Groper Epinephelus bruneus
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This study investigated the effects of water temperature, photoperiod and population density on oxygen consumption (OC) in the longtooth grouper (Epinephelus bruneus). OC rate in the longtooth grouper at 15, 20, and 25°C were 85.9±6.9, 107.5±10.1, and 164.0±19.2 mg O2 kg–1 h–1, respectively, indicating a linear increase in OC with water temperature. Photoperiod was regulated in accordance with the light (09:00-21:00 h, L) and dark (21:00-09:00 h, D)phases of the diel cycle (12L/12D), with a water temperature of 15, 20, or 25°C. OC rates during the light and dark phases were 83.8±5.4, 88.1±7.8 mg O2 kg–1 h–1, respectively, at 15°C and 111.2±12.3 and 103.7±5.7 mg O2 kg–1 h–1at 20°C. No significant differences were observed between the light and dark phases (P > 0.05). at 25°C the OC rates were 168.8±24.3 and 159.2±11.4 mg O2 kg–1 h–1 during the light and dark phases , respectively, indicating that OC is higher during daylight than nighttime. OC tates at 55.4, 88.4, 118.8, and 145.1 g L–1 were 252.0±11.6, 219.0±8.7,206.7±11.4, and 208.8±11.4 mg O2 kg–1 h–1, respectively, indicating a decrease in OC with increasing population density. However, no significant difference was observed between the values for 118.8 g L–1 and 145.1 g L–1 (P > 0.05).
Abstract
This study investigated the effects of water temperature, photoperiod and population density on oxygen consumption (OC) in the longtooth grouper (Epinephelus bruneus). OC rate in the longtooth grouper at 15, 20, and 25°C were 85.9±6.9, 107.5±10.1, and 164.0±19.2 mg O2 kg–1 h–1, respectively, indicating a linear increase in OC with water temperature. Photoperiod was regulated in accordance with the light (09:00-21:00 h, L) and dark (21:00-09:00 h, D)phases of the diel cycle (12L/12D), with a water temperature of 15, 20, or 25°C. OC rates during the light and dark phases were 83.8±5.4, 88.1±7.8 mg O2 kg–1 h–1, respectively, at 15°C and 111.2±12.3 and 103.7±5.7 mg O2 kg–1 h–1at 20°C. No significant differences were observed between the light and dark phases (P > 0.05). at 25°C the OC rates were 168.8±24.3 and 159.2±11.4 mg O2 kg–1 h–1 during the light and dark phases , respectively, indicating that OC is higher during daylight than nighttime. OC tates at 55.4, 88.4, 118.8, and 145.1 g L–1 were 252.0±11.6, 219.0±8.7,206.7±11.4, and 208.8±11.4 mg O2 kg–1 h–1, respectively, indicating a decrease in OC with increasing population density. However, no significant difference was observed between the values for 118.8 g L–1 and 145.1 g L–1 (P > 0.05).
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