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Fig. 2. Unidirectional branchial calcium influx rates
in juvenile
rainbow trout at various waterborne calcium concentrations in synthetic water
for four different lead concentrations. Control fish, black circles; fish
exposed to 0.46±0.03 µmol l-1 dissolved lead, white
triangles; 2.5±0.2 µmol l-1 lead, white circles;
4.9±0.3 µmol l-1 lead, white squares. Values are means
± 1 S.E.M. (N=7 per treatment).