Fig. 3. Rates of sodium (nmol g^-1 h^-1; left of dotted vertical line) and copper (pmol g^-1 h^-1; right of vertical dotted line) uptake in juvenile rainbow trout (A) during treatment with 2 µmol l^-1 bafilomycin A1 and (B) after treatment with 100 µmol l^-1 phenamil assessed during a 2 h incubation in the presence of 200 nmol l^-1 copper. Filled columns indicate results from pharmacologically treated fish, and open columns indicate results from corresponding vehicle (DMSO) control fish. Values are means + S.E.M., N=8 in all cases. An asterisk indicates a statistically significant difference from the corresponding control value; two-tailed Student's unpaired t-test (P<0.05).