An Investigation on Dactylogyrid Parasite Fauna of Squalius recurvirostris Özuluğ & Freyhof, 2011

Abstract

The purpose of this study is to define the dactylogyrid parasite species of Squalius recurvirostris from Düzağaç-Akdeğirmen Dam Lake (Afyonkarahisar) and their anatomical, morphological, metric and ecological characteristics. Within the scope of the research methodology, the skin surface, fins and gills of Squalius recurvirostris samples were examined for dactylogyrid parasites. While some of the Dactylogyrus sp. samples were kept in ethyl alcohol environment, some permanent preparations were made to define their anatomical, morphological and metric properties. The overall infection percentage of Dactylogyrus naviculoides belonging to the study findings was 89.4% and the average parasite density was 27.1±24.1. For Dactylogyrus vistulae, these values are 63.6% and 4.5±2.3%, respectively. Both types of parasites have been recorded in all seasons. The density of Dactylogyrus naviculoides was more dominant in the winter period and the density of Dactylogyrus vistulae in the spring compared to the other seasons. Fish samples were divided into 5 groups according to age. It was determined that both Dactylogyrus species caused higher infections in fish in the older age group. On the other hand, infection values of both parasite species were higher in male fish individuals compared to females: Dactylogyrus naviculoides (89.4%, 27.1±24.1), Dactylogyrus vistulae (63.6%, 4.5±2.3). As a result, 2 dactylogyrid parasite species were identified in Squalius recurvirostris in Düzağaç-Akdeğirmen Dam Lake. The parasitic species is the new record for Squalius recurvirostris. Thus, a new locality and a new host have been added to the geographical distribution of the related parasitic species. In addition, the cases of infection of parasitic species were evaluated ecologically.