In the last decade, considerable public and scientific attention has been focused on the zebra mussel, an aquatic invader in the Great Lakes.The zebra mussel actually is a recent addition in a long history of invaders, ranging from rainbow smelt, alewife, and lamprey to the recently introduced ruffe and spiny water flea.
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Densities of gobies in rocky areas at Calumet Harbor already exceed 20 per square meter-equivalent to 20 fish in a space the size of a bathtub.
The fish in this harbor range from 12 to 140 mm (0.5 to 5.5 inches) in length, and likely represent two age groups.
The entry of another foreign invader to the already abused Great Lakes environment is an unwelcome addition to the plethora of other problems, including habitat destruction, overfishing, pollution, and loss of native species.
From 1990 to 1992 round gobies were found only in the areas adjacent to the St. Clair and in the first 2 km of the upper Detroit River.
Clair River, the channel connecting Lake Huron and Lake St. This species comes from the same area of the world as the zebra mussel (around the Black and Caspian Seas).