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Tuesday 23 February 2016

Occurrence and morphogenetic characteristics of Gyrodactylus (Monogenea: Gyrodactylidae) from a rainbow trout farm (Lake Ladoga, Russia)

Acta Parasitologica


Occurrence and morphogenetic characteristics of Gyrodactylus (Monogenea: Gyrodactylidae) from a rainbow trout farm (Lake Ladoga, Russia)

Evgeny Ieshko1 / Yulia Barskaya1 / 1 / Jaakko Lumme2 / Oleg Khlunov3
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.
Keywords : Gyrodactylus clones; cage aquaculture; rainbow trout