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Fig. 3. Plasma ion concentrations (Na+, Cl–, Ca2+ and Mg2+) of juvenile rainbow trout following 42 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.