translate English to French: Figure 6.19 illustrates trends in PCB concentrations in Lake Trout/Walleye since the late 1970s or early 1980s.
La figure 6.19 illustre les tendances des concentrations de BPC chez le touladi/dorÃ© jaune depuis la fin des annÃ©es 1970 ou le dÃ©but des annÃ©es 1980.