Seasonal dynamics of fish predatory with nematode Eustrongylides excisus Jägerskiöld, 1909 (Nematoda: Dioctophymatidae) in Dnipro-Buh estuary and Dnipro river delta
Journal Title: Біологія тварин - Year 2017, Vol 19, Issue 4
Abstract
The article presents the results of the study of occurrence and seasonal dynamics of infection in three main predatory fish species: perch (Perca fluviatilis), pikeperch (Sander lucioperca) and pike (Esox lucius) with parasitic nematodes Eustrongylides excisus, Jägerskiöld, 1909 in the Dnipro-Buh estuary and the delta of Dnipro River, in Mykolaiv and Kherson regions. It was found that perch had the prevalence of infection 85.1 %, while prevalence of infection in pikeperch and pike was very similar — 58.1 % and 58.9 %, respectively. Two peaks of prevalence were observed during the year — in spring and in autumn. Moreover, intensity of infection was the highest in spring as well. During the spring period, prevalence of infection increased up to 95.4 %, 81.8 % and 80.4 % in perch, pikeperch, and pike respectively. In summer months prevalence of infection was lower — 72.7 %, 41.6 %, and 55.5 % in perch, pikeperch, and pike respectively. In autumn prevalence of infection had a second peak and was the following: 75.7 %, 57.6 %, and 51.9 % in perch, pikeperch, and pike respectively. The lowest prevalence of infection in predatory fish species was observed in winter: 66.6 %, 35.7 %, and 26.6 % in perch, pikeperch, and pike respectively. The overall prevalence of E. excisus nematode among predatory fish in these natural reservoirs was 70.5 %. Intensity of infection was highest in perch and ranged from 1 to 14 larvae in one specimen. The lowest intensity of infection was observed in pikeperch and ranged from 1 to 9 larvae in one specimen.
Authors and Affiliations
S. Goncharov, N. M. Soroka, A. I. Dubovyi
Keywords
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- EP ID EP310087
- DOI 10.15407/animbiol19.04.016
- Views 77
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