Abstract Total 43 Silurus glanis samples were investigated in order to detect parasites from June 2002 to May 2003 taken from Durusu (Terkos) lake. Parasites belonging to six species were recorded; Ancylodiscoides siluri (Zandt, 1924) and Ancylodiscoides vistulensis (Sivak, 1932) from Monogenoidea, Siluritaenia siluri (Batsch, 1786) from Cestoidea, Diplostomum sp. from Trematoda, Eustrongylides excisus (Jagerskiöld, 1909) from Nematoda and Argulus foliaceus (Linnaeus, 1758) from Crustacea.