Bony fish, or Osteichthyes, are a diverse group of fish characterized by their bony skeletons, as opposed to the cartilaginous skeletons found in sharks and rays. They have a wide range of shapes, sizes, and colors, making them one of the most varied groups of vertebrates in the world. Bony fish are found in nearly every aquatic environment, from deep oceans to freshwater lakes. These fish breathe using gills and often have a swim bladder, which helps them maintain buoyancy in the water. Some common examples of bony fish include salmon, trout, and tuna. They play essential roles in ecosystems and are also important for human diets and economies.