Fish is a term used to refer to lampreys, sharks, coelacanths, in addition to ray-finned fishes, yet is not a taxonomic group, which often is a clade or group that contain a common ancestral and everything its rejeton. Instead, there will be 3 main lessons, groups, or types of fish: bony fish (Osteichthyes), jawless fish (Agnatha), and even cartilaginous fish