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Topmouth gudgeon, Pseudorasbora parva is the most common invasive fishin Europe, which can compete with the juveniles of valuable commercial fishes. The goal ofthis work is to study the diet of topmouth gudgeon and trophic relationships with somenative fishes inhabiting the littoral zone of the Dniprodzerzhynsk reservoir. The obtainedrelatively low values of diet overlaps between topmouth gudgeon and other co-occurringcyprinids such as juvenile roach, Rutilus rutilus; silver bream,Blicca bjoerkna; rudd, Scardinius erythrophthalmus;Prussian carp, Carassius gibelio and bleak, Abramisbrama, indicate that it is not a serious food competitor for them, especiallycommercially valuable ones. On the contrary, high diet overlaps were observed among somenative cyprinids such as juvenile roach, silver bream, rudd, and bleak. The major preyitems of topmouth gudgeon were Chydorus sphaericus and chironomids,whereas other cyprinids selected Bosmina spp. This peculiarity may be dueto different vertical distributions of these fish in the littoral zone of the reservoir,where topmouth gudgeon inhabit near-bottom water layers, where they preyed on near-bottomand benthic zooplankters and chironomids, while juvenile roach, silver bream, rudd, andjuvenile and adult bleak live in higher water layers, where they preyed on pelagiczooplankton

Trophic interaction between topmouth gudgeon (Pseudorasbora parva) and the co-occurring species during summer in the Dniprodzerzhynsk reservoir