Inter-individual differences in rates of routine energy loss and growth in young-of-the-year juvenile Atlantic cod

• Published in: Journal of Fish Biology
• Main Authors: Peck, M. A., Buckley, L. J., Bengtson, D. A.
• Format: Text
• Language: unknown
• Published: DigitalCommons@URI 2004
• Subjects: Growth rate; Juvenile cod; Routine energy loss; atlantic cod; Gadus morhua
• Online Access: https://digitalcommons.uri.edu/favs_facpubs/82; https://doi.org/10.1111/j.1095-8649.2004.00366.x

Inter-individual differences in rates of routine (non-feeding) metabolism and growth were evaluated in young-of-the-year (YOY) juvenile Atlantic cod Gadus morhua. Rates of O2 consumption, CO2 production and ammonia (TAN) excretion were measured in 64, 25-43 mm standard length (L s) YOY growing at different rates (0.27-0.47 mm day-1) in a common rearing tank. Parameter rates (y) increased allometrically (y = a·Mb) with increasing body mass (M) with b-values for O 2 production, CO2 consumption and TAN excretion equal to 0.81, 0.89 and 0,56, respectively. In some cases, residuals from these regressions were significantly negatively correlated to fish growth rate. In no cases did residuals of parameter rates increase with increasing growth rate. These data suggest that, during unfed periods, relatively fast-growing fish were more metabolically efficient than slower-growing fish from the same cohort. The fish condition factor, derived from M·Ls-2.89, also significantly decreased with increasing growth rate. Results indicated differences in both the rates of routine energy loss and the patterns of growth allocation among YOY Atlantic cod. Since these physiological attributes were positively correlated with growth rate, they may be indicative of 'survivors' in field populations. © 2004 The Fisheries Society of the British Isles.