Population dynamics and dietary habits of monkey goby (Neogobius fluviatilis) in its native range in the Dnieper River basin
Alexander Didenko
A * , Igor Buzevych A , Yuriy Volikov B , Alexander Gurbyk A , Svitlana Kruzhylina A and Vitaliy Bekh A C
+ Author Affiliations
- Author Affiliations
A Institute of Fisheries of the National Academy of Agrarian Sciences of Ukraine, Obukhivska Street 135, UA-03164 Kyiv, Ukraine.
B Institute of Hydrobiology of the National Academy of Sciences of Ukraine, Prospekt Geroiv Stalingradu, 12, UA-04210 Kyiv, Ukraine.
C Department of Aquaculture, National University of Life and Environmental Sciences of Ukraine, General Rodimtsev Street 19, UA-03041 Kyiv, Ukraine.
Marine and Freshwater Research 73(8) 1083-1097 https://doi.org/10.1071/MF22049
Submitted: 8 February 2022 Accepted: 17 June 2022 Published: 14 July 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Various aspects of the monkey goby (Neogobius fluviatilis) biology were studied but mainly in native marine and invaded freshwater bodies; however, in Ukraine, this species can be considered native in many freshwaters.
Aim: To investigate the population dynamics and dietary habits of N. fluviatilis in a freshwater habitat in its native range.
Methods: Samples were collected monthly in 2015–2016 and 2018 in a river flowing into the Kaniv reservoir (Dnieper River).
Key results: Goby abundance varied during a year and between years, depending on water temperature. Young of the year started appearing in June and reached the size of adult fish in October. N. fluviatilis had multiple spawnings occurring from May to August. Altogether, 70 taxa of prey organisms composed its diet, among which the most abundant prey were chironomids (57.7% in number). The diet of N. fluviatilis showed a clear ontogenetic shift from the consumption of benthic microcrustaceans to chironomids.
Conclusions: N. fluviatilis fed predominantly on prey inhabiting non-vegetated sand and mud substrate. The opportunistic feeding strategy, combined with time-expanded multiple spawnings, can facilitate the successive invasion and establishment of this species in new environments.
Implications: The obtained results can be used to predict the impact of N. fluviatilis on ecosystems in newly invaded areas.
Keywords: alien, Dnieper, fish diet, fish growth, Gobiidae, invasive species, monkey goby, Ponto-Caspian.
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