The Animal Biology

THE SEASONAL DYNAMICS OF THE CRYPTOCOTYLE INVASION OF GOBIIDAE FISHESBY THE TREMATODA CRYPTOKOTYLE LÜHE, 1899 (TREMATODA: HETEROPHYIDAE) IN THE ESTUARY WATERS AND IN THE BLACK SEA AREA OF SOUTHERN UKRAINE

S. L. Honcharov

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National University of Life and Environmental Sciences of Ukraine,
16 Polkovnyka Potekhina str. Kyiv, 03041, Ukraine

The following article is devoted to the results of the analysis of distribution and seasonal dynamics of the cryptocotyle invasion of the fishes from Gobiidae bloodline: Mesogobius batrachocephalus Pallas, 1814, Neogobius melanostomum Pallas, 1814 and Neogobius fluviatialis Pallas, 1814, by the parasitic trematodes from the Heterophyidae bloodline in the estuary waters and the Black Sea area near Mykolaiv and Odesa regions. It has been found out that N. melanostomum had the highest rates of invasion — the invasion extensiveness counted 59.2 %. The invasion extensiveness of M. batrachocephalus and N. fluviatialis counted 17 % and 30.4 % respectively. It was observed that the invasion rates reach their highest points twice a year — in summer and in autumn. It was noted that the maximal rates of the cryptocotyle invasion extensiveness and intensiveness are reached in autumn. The highest percentage of the invaded fishes belonged to N. melanostomum — the invasion extensiveness counted 72.7 %.
The invasion extensiveness of M. batrachocephalus and N. fluviatialis counted — 28.5 and 48.1 %. The level of invasion among the fishes slightly dropped down in summer. N. melanostomum could be characterized by the highest invasion extensiveness level — 57.1 %. The invasion extensiveness of M. batrachocephalus and N. fluviatialis counted 11.1 % and 20.1 %, respectively. In winter the invasion extensiveness counted 45.4 % for N. melanostomum, 16.6 % for M. batrachocephalus and 30.7 % for N. fluviatialis. The lowest rates on invasion among Gobiidae fishes were shown in spring, in comparison with other seasons — 44.4 % for N. melanostomum, 7.14 % for M. batrachocephalus and 26.7 % for N. fluviatialis. The level of distribution of the metacercaria trematodes from the Heterophyidae bloodline among the Gobiidae fishes in the researched natural waters counted 31.4 %. The invasion intensiveness was noted to be at the highest point among N. melanostomum — up to 211 metacercaria in one sample. M. batrachocephalus had the lowest rates — up to 89 larvae of the parasite.

Keywords: TREMATODES, METACERCARIA, CRYPTOCOTYLES, DISTRIBUTION, SEASONAL DYNAMICS, GOBIIDAE FISHES

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