Round Gobys spread rapidly throughout the Great Lakes since their discovery in 1990. They are very competitive and are able to reproduce and populate new areas quite easily.
In addition to habitat domination, Round Gobys will also eat the eggs and the young of indigenous fish. It is presumed that they arrived via the ballast water of transoceanic vessels.
The goby’s ability to survive in degraded environmental conditions has helped to increase its competitive advantage compared to native species.