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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 l1 (hatched bars) or 2034 µg Ni
l1 (filled bars). Values are means ±1
S.E.M. (N=610). 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.