The aim of this study that was carried out from September, 2009 to August, 2010 was to determine the seasonal distribution of rudd fish (Scardinus erythrophthalmus L. 1758) helminthes inhabiting the Terkos lake. During the study examined 166 fish rudd, Dactylogyrus difformis from Monogenia, Ligula intestinalis plerocercoid from Cestoda, Asymphylodora markesvitschi Diplostomulum spathaceum metacerceria from Digenia, Piscicola geometra from Hirudinea were parasited.87% with 137 fish recorded the highest infection D. difformis winter, D. spathaceum metacerceria summer with 83 fish recorded the highes infection 64%, 51% L. intestinalis plerocercoid in infection with 53 fish recorded the highest recorded in the spring, 31% A. markesvitschi 15 fish recorded highest infection spring and P. geometra 9 fish the spread of infection showed the highest with 18% in spring seasons.