Figure 6. Relationships between forced and spontaneous maximum metabolic rates in lake sturgeon Acipenser fulvescens.

Data collection comprised three test groups: control (100% O_2sat; 12L∶12D), treatment A (30% O_2sat; 12L∶12D), and treatment B (100% O_2sat; 24L). Spearman's rank statistics were used to test for correlations between forced (MMR_F) and spontaneous (MMR_S) residual (i.e. body mass corrected) maximum metabolic rate (mg O₂ h⁻¹) measured in individual A. fulvescens. In the control group, there was no significant relationship between the residuals (P = 0.40; ρ = 0.27). In contrast, the residuals correlated positively in both treatments A and B (both P<0.05; ρ≥0.66).