The Influence of Water Temperature and Body Weight on Metabolic Rate of Olive Flounder Paralichthys olivaceus

• Published in: Ocean and polar research Vol. 34; no. 1; pp. 93 - 99
• Main Authors: Oh, S-Y, Jang, Y-S, Park, H-S, Choi, YU, Kim, C-K
• Format: Journal Article
• Language: Korean
• Published: 01.03.2012
• Subjects: Marine; Paralichthys olivaceus; Pleuronectiformes
• ISSN: 1598-141X; 2234-7313
• DOI: 10.4217/OPR.2012.34.1.093

The effect of water temperature and body weight on oxygen consumption by the fasted olive flounder Paralichthys olivaceus was investigated in order to assess the metabolic rate of this species under different conditions. The oxygen consumption rate (OCR) was measured at three different water temperatures (15, 20 and 25 degree C) and two different body weights [9.11 plus or minus .2 g (mean plus or minus SD) for the juvenile group and 266.4 plus or minus 29.3 g for the immature group] at an interval of 5 minutes for 24 hours using a closed flow-through respirometer. For each treatment condition, three replicates were set up and 135 fish in the juvenile group and 18 fish in the immature group were used. The OCRs exhibited a linear increase described by OCR=-82.06+28.30T (r super(2)=0.96, p<0.001) in the juvenile group and OCR=-52.52+14.73T (r super(2)=0.97, p<0.001) in the immature group. The OCRs decreased with increasing body weights at a given water temperature (p<0.001). The metabolic rate was related to the body weight of the fish as a power function with a weight exponent of between 0.77 and 0.82. Q sub(10) values ranged 1.67 similar to 2.28 when the temperature was between 15 and 20 degree C, 1.57 similar to 1.93 when the temperature was between 20 and 25 degree C, and 1.79-1.89 when the temperature was between 15 and 25 degree C. The energy expenditure by respiration increased with increasing water temperature and decreasing body weight (p<0.001). The mean energy loss rates at 15, 20 and 25 degree C were 115.9, 149.8 and 208.2 kJ kg super(-1)d super(-1) in the juvenile groups and 53.8, 81.2 and 101.9 kJ kg super(-1)d super(-1) in the immature groups.