. 2019 Oct 1;7:e7784. doi: 10.7717/peerj.7784

Table 2. Metabolic rate and swimming performance of cod and haddock.

Standard metabolic rate (SMR), routine metabolic rate (RMR), swimming-induced maximum metabolic rate (MMR_S), swimming-induced aerobic scope (AS_S), critical swimming speed (U_crit), optimal swimming speed (U_opt), and minimum cost of transport (COT_min) for 12 °C-acclimated cod and haddock swimming at 12 °C and 12 °C-acclimated cod swimming at 16 °C. Note that SMR was estimated by extrapolating the ${\dot{M}}_{O_{2}}$ vs. swimming speed relationship back to a swimming speed of zero. Metabolic rates scaled to a body mass of 100 g (using a metabolic mass-scaling coefficient of 0.80) are presented in italics in parentheses. Comparisons between groups were made using one-way ANOVAs followed by Holm–Sidak post hoc tests.

	Cod, 12 °C	Cod, 16 °C	Haddock, 12 °C
n	8	9	8
M (g)	67.6 ± 5.4^a	61.3 ± 2.9^a	63.0 ± 1.8^a
L (cm)	20.9 ± 0.6^a	20.9 ± 0.3^a	18.7 ± 0.2^b
K	0.73 ± 0.04^a	0.67 ± 0.02^a	0.96 ± 0.02^b
SMR (mg O₂ h⁻¹ kg⁻¹)	156.7 ± 15.2^b (144.0 ± 13.8^b)	227.6 ± 19.4^a (205.2 ± 16.0^a)	84.3 ± 4.2^c (76.9 ± 4.1^c)
RMR (mg O₂ h⁻¹ kg⁻¹)	185.0 ± 15.5^b (170.0 ± 14.1^b)	256.3 ± 17.8^a (231.1 ± 14.4^a)	119.4 ± 7.1^c (108.9 ± 6.8^c)
MMR_S (mg O₂ h⁻¹ kg⁻¹)	315.0 ± 13.8^a,b,(e) (289.1 ± 9.8^a)	353.3 ± 16.2^a,(d) (319.7 ± 14.5^a)	284.9 ± 6.0^b,(f) (259.5 ± 4.7^b)
AS_S (mg O₂ h⁻¹ kg⁻¹)	130.0 ± 18.6^a,b (119.0 ± 16.6^a,b)	97.0 ± 18.0^a (88.5 ± 16.8^a)	165.5 ± 12.3^b (150.6 ± 11.0^b)
U_crit (cm s⁻¹)	54.7 ± 1.4^a,(d)	50.6 ± 1.9^a,(e)	56.5 ± 1.4^a,(d)
U_crit (BL s⁻¹)	2.62 ± 0.09^a	2.42 ± 0.08^a	3.02 ± 0.09^b
U_opt (cm s⁻¹)	25.1 ± 2.3^a	23.1 ± 1.4^a	21.4 ± 0.7^a
U_opt (BL s⁻¹)	1.21 ± 0.12^a	1.11 ± 0.06^a	1.14 ± 0.04^a
COT_min (mg O₂ km⁻¹ kg⁻¹)	55.4 ± 7.7^a	40.3 ± 10.9^a	52.3 ± 7.0^a

Notes:

^a,b,c

Significant differences between groups at P < 0.05

^d,e,f

Differences at P < 0.10 (pairwise comparisons).

n, number of experimental animals; M, body mass; L, fork length; K, condition factor. Values are means ± s.e.m.