Bìol. Tvarin, 2017, volume 19, issue 4, pp. 16–23

SEASONAL DYNAMICS OF FISH PREDATORY WITH NEMATODE EUSTRONGYLIDES EXCISUS JÄGERSKIÖLD, 1909 (NEMATODA: DIOCTOPHYMATIDAE) IN DNIPRO-BUH ESTUARY AND DNIPRO RIVER DELTA

S. L. Goncharov1, N. M. Soroka2, A. I. Dubovyi3

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1Mykolaiv regional state laboratory of veterinary medicine,
2A 10th Slobydska str., Mykolayiv 54003, Ukraine

2National University of life and environmental sciences of Ukraine,
16 Polkobnyka Potekhina str., Kyiv 03041, Ukraine

3The University of Auckland, 
85 Park Road, Auckland 1023, New Zealand

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.

Keywords: NEMATODE, LARVAE, EUSTRONGYLIDES EXCISUS, OCCURRENCE, SEASONAL DYNAMICS, PREDATORY FISH

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