several major Eurasian rivers, and the North American Great Lakes.

Characteristics

Round gobies are small, soft-bodied fish characterized by a distinctive black spot on the first dorsal fin. The eyes are large and protrude slightly from the top of the head and, like most gobies, the pelvic fins are fused to form a single disc (shaped like a suction cup) on the belly. Round gobies range in length from 4 to 10 in, with a maximum size of 24.6 cm. They weigh between 0.176 and 2.816 oz, their weight

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