Goby, GOH bee, is the name of about 2,000 kinds of fish that live in the shallow parts of warm oceans. A few species also live in cool ocean waters and enter freshwater rivers, streams, and lakes. Gobies have a pair of pelvic fins that join on the underside of the body to form a cup. This cup can create suction, which enables the fish to attach itself to rocks, coral, or other fish.