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Fig. 4. Plasma stress indicators in juvenile rainbow trout following 42 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.