The routine metabolic rate of mulloway ( Argyrosomus japonicus: Sciaenidae) and yellowtail kingfish ( Seriola lalandi: Carangidae) acclimated to six different temperatures

• Published in: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Vol. 152; no. 4; pp. 586 - 592
• Main Authors: Pirozzi, Igor, Booth, Mark A.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.04.2009
• Subjects: Acclimatization - physiology; Animals; Argyrosomus japonicus; Energy Metabolism; Marine; Metabolism; Open-top respirometry; Oxygen Consumption; Oxygen transfer; Perciformes - metabolism; Routine metabolic rate; Seriola lalandi; Species Specificity; Temperature; Oxygen transfer; Oxygen consumption; Temperature; Open-top respirometry; Metabolism; Routine metabolic rate
• ISSN: 1095-6433; 1531-4332
• DOI: 10.1016/j.cbpa.2009.01.008

This study compared the mass-specific routine metabolic rate (RMR) of similar sized mulloway ( Argyrosomus japonicus), a sedentary species, and yellowtail kingfish ( Seriola lalandi), a highly active species, acclimated at one of several temperatures ranging from 10–35 °C. Respirometry was carried out in an open-top static system and RMR corrected for seawater–atmosphere O 2 exchange using mass-balance equations. For both species RMR increased linearly with increasing temperature ( T). RMR for mulloway was 5.78 T − 29.0 mg O 2 kg − 0.8 h − 1 and for yellowtail kingfish was 12.11 T − 39.40 mg O 2 kg − 0.8 h − 1 . The factorial difference in RMR between mulloway and yellowtail kingfish ranged from 2.8 to 2.2 depending on temperature. The energetic cost of routine activity can be described as a function of temperature for mulloway as 1.93 T − 9.68 kJ kg − 0.8 day − 1 and for yellowtail kingfish as 4.04 T − 13.14 kJ kg − 0.8 day − 1 . Over the full range of temperatures tested Q 10 values were approximately 2 for both species while Q 10 responses at each temperature increment varied considerably with mulloway and yellowtail kingfish displaying thermosensitivities indicative of each species respective niche habitat. RMR for mulloway was least thermally dependent at 28.5 °C and for yellowtail kingfish at 22.8 °C. Activation energies ( E a) calculated from Arrhenius plots were not significantly different between mulloway (47.6 kJ mol − 1 ) and yellowtail kingfish (44.1 kJ mol − 1 ).