Fig. 6. (A) The effects of the voltage-dependent Ca²⁺ channel blockers nifedipine and verapamil on calcium uptake in juvenile rainbow trout exposed to control conditions (black bars) or 100 µmol l^-1 nifedipine and 100 µmol l^-1 verapamil (white bars) in synthetically modified water (600 µmol l^-1 Ca²⁺). (B,C) The effect of nifedipine on branchial lead accumulation in juvenile trout exposed to control conditions (black circle) or (B) to 0.1, 1, 10 and 100 µmol l^-1 nifedipine (white circles), (C) to 0.1, 1, 10 and 100 µmol l^-1 verapamil (white circles). Values are means ± 1 S.E.M. (N=7 per treatment).