What is the system of scales on an osteichthyes?

Osteichthyes, or bony fish, typically possess scales that can be classified into three main types: cycloid, ctenoid, and ganoid. Cycloid scales are smooth and round, while ctenoid scales have a comb-like edge, both providing protection and reducing drag in water. Ganoid scales, found in some primitive fish, are thicker and have a shiny surface. These scales are composed primarily of bone and help in maintaining the fish's buoyancy and hydrodynamics.