Difference between boney fish and cartilaginous fish?

Bony fish have endoskeletons made from bone, and cartilaginous fish have endoskeletons made from cartilage, the same material found in the noses of humans. Cartilaginous fish do not have swim bladders, but bony fish do. Cartilaginous fish have placoid scales or are naked, and bony fish have cycloid or ctenoid scales or are naked. Both organisms have jaws, paired appendages, vertebrae, gills, fin, notochords, and a dorsal nerve tail that leads to a distinct brain.