Bioaccumulation of copper and zink in Oreochromis Mossambicus and Clarias Gariepinus, from the Olifants River, Mpumalanga, South Africa Bioaccumulation of copper and zink in Oreochromis Mossambicus and Clarias Gariepinus, from the Olifants River, Mpumalanga, South Africa Posted in .