The Bony Fishes (Class Osteichthyes) include most fish.
They are cold-blooded vertebrates and breathe through a pair of gills. They are covered with tough, protective scales and have pairs of fins for swimming. Most are flattened from side to side and have an organ called a swimbladder that helps keep them afloat.
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Amsel, Sheri. "ABOUT FISH (Osteichthyes - Bony Fish)" Exploring Nature Educational Resource ©2005-2021. October 22, 2021
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