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Bighead goby (Neogobius kessleri) and round goby (Neogobiusmelanostomus) have been invading new non-native areas about two decadessuccessfully. In this study, diet spectrum, seasonal variation, feeding strategy and dietoverlap between these two invasive species were assessed. Materials were collected fromthe Danube at Bratislava by fishing rods and/or electrofishing. The diet spectrum of bothspecies was diverse: a total of 46 food types in bighead goby and 51food types in roundgoby were observed. Dikerogammarus sp., chironomid larvae andCorophium sp. were the most predominant food types in bighead goby,whereas in round goby, chironomid larvae, Corophium sp., bryozoans andCladocera predominated. The diet varied over seasons. In the Slovak part of the Danube,bighead goby and round goby have adapted to local food resources, consuming diverse foodfrom small to large items, both with soft and/or hard body. This enhances the capabilityof these invasive species to spread successfully. It appears that even if both exploitsimilar food resources, their proportional content differs. Further differences betweenthese gobies were also found in their food behaviour and feeding strategy. Both speciestend to be specialists where possible, but round goby demonstrates higher flexibilitytowards general feeding strategy

Do invasive bighead gobyNeogobius kessleriand round gobyN. melanostomus(Teleostei, Gobiidae) compete for food?