In this study, an attempt has been made to compare the most common species of tapeworms in carp: non-segmentary Khawia sinensis and segmentary Bothriocephalus acheilognathi on the basis of histoenzymatic examination of 8 enzymes, i.e. alkaline phosphatase, acid phosphatase, adenosine triphosphatase, nonspecific esterase alfa, succinic dehydrogenase, lactate dehydrogenase, leucine aminopeptidase and gamma-glutamylo transferase.