Posthodiplostomatosis In Fish Ponds And Natural Waters

Abstract

Posthodiplostomatosis is disease of young freshwater fishes of families Cyprinidae and Cobitidae resulting from the infection with metacercaria, developmental stages of Posthodiplostomum cuticola. Metacercaria present as a black cysts located primarly in the skin, in the sub-epidermal tissue and in the fins. The disease caused by P. cuticola in this fish species is detected in Serbian fishponds for the first time, while in natural waters has been present for many years. It is diagnosed in the grass carp (Ctenopharyngodon idella) and the bighead carp (Aristichthys nobilis) in the form of dark discolorations on fins and cysts that measured approximately 1 mm in diameter. Disease resulted in low percentage of survival in fingerlings and fish weight reduction. Posthodiplostomatosis occured in fishponds in which the preventive measures were not implemented, i.e. where the nurseries were not dried up and mechanically cleaned.

Postodiplostomatoza je obolenje mlađih kategorija slatkovodnih riba familja Cyprinidae i Cobitidae koje se karakteriše infekcijom metecerkarijama, razvojnim stadijumomm Posthodiplostomum cuticola. Metacercarije su prisutne kao crne ciste locirane prvenstveno u koži, subepidermalnom tkivu i perajima. Obolenje izazvano P. cuticola konstantovano je prvi put na našim ribnjacima, dok je u otvorenim vodama prisutno već duži niz godina. Dijagnostikovano je kod belog amura (Ctenopharyngodon idella) i sivog tolstolobika (Aristichthys nobilis) u vidu promena na perajima u obliku tamnih diskoloracija i cisti veličine oko 1 mm. Kao posledica obolevanja došlo je do redukcije telesne mase mladunaca, kao i smanjenja preživljavanja. Postodiplostomatoza se javlja na ribnjacima gde se ne primrnjuju preventivno-profilaktičke mere, odnosno gde se objekti za uzgoj mladunaca ne isušuju i mehanički ne obrađuju.