Fish, fry, eggs, and mollusks
Hardy and adaptable to a variety of water temperatures and salinity levels, these fish prefer lake bottom habitats with plenty of sheltering structure.
Native to the Caspian Sea basin, the round goby was introduced throughout Europe and the Lake Superior basin through the ballast water of oceanic freight ships. Hardy and aggressive, these fish have impacted native Minnesota populations through predation and through territorial nesting habits. However, round gobies are some of the few fish species that will prey on Lake Superior’s invasive zebra mussel population. In fact, some large gobies almost exclusively eat zebra mussels – one benefit to this otherwise locally detrimental species.