1Institute of Biology, Karelian Research Centre, Russian Academy of Sciences, Pushkinskaya St. 11, 185910, Petrozavodsk, Russia
2Department of biology, University of Oulu, POB 3000, FI-90014, Finland
3Petrozavodsk State University, pr. Lenina 33, 185910, Petrozavodsk, Russia
Citation Information: Acta Parasitologica. Volume 61, Issue 1, Pages 151–157, ISSN (Online) 1896-1851, ISSN (Print) 1230-2821, DOI:
10.1515/ap-2016-0020, December 2015
Publication History
- Received:
- 2014-07-09
- Revised:
- 2014-07-09
- Accepted:
- 2015-10-12
- Published Online:
- 2015-12-30
Abstract
Gyrodactylus
parasite infected juveniles on rainbow trout Oncorhynchus mykiss
(Walbaum, 1792) from a fish farm in Lake Ladoga were investigated. The
observed cases of infection in fish featured a high prevalence, when
almost all of the fish were infected. However, if an outbreak of the
monogenean infection is observed in spring, the intensity of the
infection may be low, and when the infection occurs in the ice-covered
period (late autumn - winter), the number of parasites on the fins of a
single fish may exceed 3000 specimens. Molecular identification of the
parasite demonstrated that the infecting clone was identical with
rainbow trout specific strain of Gyrodactylus salaris RBT widely spread
in Northern Europe, but a small proportion of the parasites were the
hybrid clone Gyrodactylus pomeraniae x G. lavareti. Morphological
variations of hooks and other opisthaptor parts in the monogenean
Gyrodactylus depending on the intensity of infection in rainbow trout
were demonstrated.
