Scientists at the Great Lakes Science Center, in cooperation with the University of Michigan, Smith-Root, Inc. This fin can be used by gobies as a suction cup to anchor to rocks and other hard substrates during times of high water flow. Sculpins have two distinct pelvic fins, not one large fin. Round gobies look similar to our native sculpins, but the two species can be easily separated by the fused pelvic fins on the underside of round gobies. Round gobies have a soft body and a large, rounded head with eyes that protrude near the top. Females and immature male round gobies are a mottled gray and brown color. Round gobies can reach up to 10 inches in length as adults, but usually they are less than 7 inches long in the Great Lakes. Clair River, round gobies have spread to all of the Great Lakes and are working their way inland through the rivers and canal systems. Originally from the Black and Caspian Sea areas of Eastern Europe, it is believed that this exotic species arrived in the ballast water of vessels coming into the Great Lakes. Neogobius Melanostomus The round goby, Neogobius melanstomus, is a small, bottom - dwelling fish that was first found in the Great Lakes region in 1990.
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