Fig. 6. Cu concentration in gills (µmol g^–1 wet mass) during the exposure period (A) and the percentage contribution of the gill to total body Cu burden during the exposure period (B). Percentage data were transformed to arc sin for statistical analysis. All the values are means ± S.E.M., N=15 for weeks 0, 2 and 4, and N=9 for week 7 for each of the treatment. Diamonds, low waterborne Cu and low dietary Cu; triangles, low waterborne Cu and normal dietary Cu; open circles, normal waterborne Cu and low dietary Cu; filled circles, normal waterborne Cu and normal dietary Cu; squares, normal waterborne Cu and high dietary Cu levels. *Significantly higher level, significantly lower level relative to the group on normal levels of water Cu and dietary Cu (ANOVA, P<0.05).