Pelagic occurrence and diet of invasive round goby Neogobius melanostomus (Actinopterygii, Gobiidae) juveniles in deep well-mixed European reservoirs.

0459622 - BC 2017 RIV NL eng J - Článek v odborném periodiku
Jůza, Tomáš - Zemanová, Jana - Tušer, Michal - Sajdlová, Zuzana - Baran, Roman - Vašek, Mojmír - Ricard, Daniel - Blabolil, Petr - Wagenvoort, A. J. - Ketelaars, H. A. M. - Kubečka, Jan
Pelagic occurrence and diet of invasive round goby Neogobius melanostomus (Actinopterygii, Gobiidae) juveniles in deep well-mixed European reservoirs.
Hydrobiologia. Roč. 768, č. 1 (2016), s. 197-209. ISSN 0018-8158. E-ISSN 1573-5117
Grant CEP: GA MŠMT(CZ) EE2.3.20.0204; GA MŠMT(CZ) EE2.3.30.0032
Institucionální podpora: RVO:60077344
Klíčová slova: Biesbosch reservoirs * fish community composition changes * invasive species * vertical distribution * length distribution * fry trawling
Kód oboru RIV: EH - Ekologie - společenstva
Impakt faktor: 2.056, rok: 2016

Round goby is generally accepted to be a typical benthic dwelling fish species both in its native and invasive ranges. Nevertheless, mid-water night trawling in the Biesbosch reservoirs (The Netherlands) identified pelagic occurrence of invasive round goby juveniles, which is the first observation of pelagic utilization in Europe. Subsequent diet analysis revealed the presence of benthic and also pelagic zooplanktonic prey in the digestive tracts of investigated fish, which further confirmed active feeding in the pelagial. Round goby juveniles almost completely avoided the surface water layer and their maximum density always occurred below 6 m in all reservoirs. The observed size spectrum (8-58 mm standard length) included the largest pelagic round goby to ever be mentioned in the scientific literature. Our data also showed that round goby prevailed over other species soon after its invasion into the reservoirs, with native species disappearing from the fry community. This study documents the first evidence of the pelagic occurrence and feeding of round goby juveniles, and confirms the importance of pelagic habitats for early stages of this invasive species in European lentic systems.
Trvalý link: http://hdl.handle.net/11104/0259784