Several of these classes are specific types of fish, for example: jawless fish, like lampreys and hagfish, and cartilaginous fish, like sharks and rays.
Primo, the cyclostomes, whose jaws are fused into a flexible ring and whose gill openings are simply a large number of holes, an order consisting of only one family. Example: the lamprey.
When sea lamprey first and great mated the Great Lakes many people suggested, " Have you considered actually fishing for sea lamprey? Maybe people be willing to eat them" .