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Unformatted text preview: The class includes the sharks, skates, and rays. Gas exchanges are made at several prominent, vertical gill openings on either side of the throat. The bony fishes belong to the class Osteichthyes . Most of the familiar fishes living today are bony fishes. They live in the oceans (for example, tuna, mackerel, and herring) and in fresh water (for example, striped bass, trout, and goldfish). The bony fishes prospered during the Devonian Period, which is also called the Age of Fishes. Bony fishes have gills as well as fleshy pectoral and pelvic fins. The ray-finned fishes are the predominant type of bony fishes living today. These fishes have a swim bladder , which is a gas-filled sac near the gut that permits a fish to change its buoyancy....
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- Fall '07