Finding the best estimates of metabolic rates in a coral reef fish

• DOI: 10.1242/jeb.082925
• Publication Date: 2013-03-08T03:40:07Z
• Authors: Dominique G. Roche; Sandra A. Binning; Yoland Bosiger; Jacob L. Johansen; Jodie L. Rummer
• Keywords: Respirometry; Respirometer

Summary Metabolic rates of aquatic organisms are estimated from measurements oxygen consumption (ṀO2) through swimming and resting respirometry. These distinct approaches increasingly used in eco- conservation physiology studies; however, few studies have tested whether they yield comparable results. We examined two fundamental ṀO2 measures, standard metabolic rate (SMR) maximum (MMR), vary based on the method employed. Ten bridled monocle bream (Scolopsis bilineatus) were exercised using (1) a critical speed (Ucrit) protocol, (2) 15 min exhaustive chase protocol (3) 3 followed by brief air exposure. Protocol was performed respirometer whereas protocols SMR estimates respirometry similar to those when three-parameter exponential or power function extrapolate speed-ṀO2 relationship zero speed. In contrast, MMR Ucrit 36% higher than derived 23% 1 exposure protocol. For strong steady (endurance) swimmers, such as S. bilineatus, can produce more accurate because is measured during exertion. However, impractical, should be supplemented with improve measurement accuracy. Caution warranted comparing obtained different methods unless cross-validated species-specific basis.