[RETRACTED] Parasites from the fish Clarias gariepinus as potential biondicators for heavy metal pollution in freshwater systems. UNED Res. J. [Internet]. 2012 Dec. 1 [cited 2026 Jul. 31];4(2):165-73. Available from: https://revistas.uned.ac.cr/index.php/cuadernos/article/view/4