Definitions for "Pectoral Fin"
Keywords:  fin, gill, flipper, fish, posterior
This is a fin that is usually behind (posterior to) the operculum. It can be in the middle of the body or on the underside (ventral side) of the body.
one of the most anterior paired set of fins, in most livebearers located laterally immediately posterior to the gill slit, on the side of the body. Used for fine movement backward and forward.
These fins are on the sides of the fish. They are often used for more precise maneuvering. In a few species they are used for propulsion.