Is water pollution the only cause of abnormalitiesof the attachment clamps of monogeneans (Diplozoidae),a parasite of freshwater fish?
A. E. ZHOKHOV1,2, M. N. PUGACHEVA2, O. N. ZHIGILEVA1
1AquaBioSafe Laboratory, Tyumen State University, Tyumen, Russia
2Papanin Institute for Biology of Inland Waters, Borok, Russia
Keywords: parasites, fishes, monogeneans, teratogenic disorders, pollution
Abstract
A comparative study of the haptoral morphology of three species of diplozoon (Monogenea: Diplozoidae) from the gills of fish from polluted water bodies (the Obʼ River, Rybinsk Reservoir, Russia) and unpolluted Lake Tana (Africa) has been made. An examination of the haptors of Paradiplozoon megan (Bychowsky et Nagibina, 1959) from ide and Diplozoon paradoxum von Nordmann, 1832 from bream caught in the Obʼ River and Rybinsk reservoir has revealed a large number of abnormalities of the attachment clamps. Various abnormalities of the attachment clamps were also found in Paradiplozoon spp. from the barbel from the Lake Tana, which does not experience industrial pollution. According to the literature data, abnormalities in the structure of the attachment haptor in diplosoids were also found in relatively clean water bodies. Only in unpolluted water bodies such type of abnormalities as the formation of rudiments of the fifth and sixth clamps was recorded. It is hypothesized that pollution of water is not the main reason for the formation of anomalies in the structure of clamps, there is a native (“genetic background”) frequency of occurrence of abnormalities in Diplozoidae.
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