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Fig. 5. Critical swimming speed (Ucrit) of juvenile rainbow trout following 12 days and 24 days of exposure to either control (open bars), 384 µg Ni l–1 (hatched bars) or 2034 µg Ni l–1 (filled bars). Values are means ±1 S.E.M. (N=6–10). Asterisks indicate significant difference (P<0.05) from control mean by a one-way ANOVA with a two-sided Dunnett's post-hoc multiple comparison test. BL = body lengths.