Fig. 7. Group regressions of the log of oxygen consumption rate (µ_O2) against swimming speed for which BL represents body lengths. (A) Day 0 (initial sampling). The slopes of the two group regression lines are not significantly different. Group regression equations were y=0.213x+0.349, r=0.809 (control) and y=0.206x+0.361, r=0.853 (Ni), where y=log µ_O2 and x=swimming speed. (B) Day 34 of Ni exposure. The slope of the regression line in the Ni group is significantly different (P<0.05) from that of the control fish. Group regression equations were y=0.270x+0.111, r=0.869 (control) and y=0.204x+0.249, r=0.644 (Ni). BL, body lengths.