Juvenile Round Goby
Juvenile round gobies are generally a solid, slate gray in color. They have a light border around the black spot which is usually present on the frontal dorsal fin. Juvenile round gobies typically resemble adult gobies.
Adult Round Goby
Adult gobies typically have mottled gray, olive green, and brown markings on the skin. Their dorsal fins may be greenish in color and it usually lacks spines. A black spot is sometimes found on the front dorsal fin but the round gobies of the Great Lakes tend to lack this identifying feature. Round gobies have raised eyes on the top of the head and fused pelvic fins that form suction cups. They can grow up to 17.8 centimeters in American waters, but can get even larger in their native habitat. Male gobies guard nests of eggs and newly hatched offspring. Gobies are able to feed at night and can detect prey only when stationary.
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