Figure 1

Effects of sub-chronic Cu exposure on oxygen consumption rate (A), Ammonia excretion rate (B) and O:N ratios (C) of C. dauricus. The bars are the respective standard errors (n = 4). Note: values with small letters represent significant difference with respect to Cu concentration within a day (P < 0.05); Values with big letters mean significant difference with respect to days within a concentration (P < 0.05).