Fig. 1. Maximum continuous swimming speed (U_max,c) versus fork length (FL) in chub mackerel (Scomber japonicus) acclimated to 18°C (open squares) or 24°C (filled squares) measured at the respective acclimation temperature. The lines are the best-fitting linear regressions (with coefficients ± S.E.M.): U_max,c= (0.168±0.075)FL+(36.6±16.0), r²=0.33, N=12, P=0.049, at 18°C (dashed line); U_max,c=(0.308±0.114)FL+(31.4±22.9), r²=0.48, N=10, P=0.027, at 24°C (solid line). At a given FL, U_max,c was significantly greater at 24°C (ANCOVA; P=0.001), but U_max,c increased with FL at the same rate at the two temperatures.