Rinnalülid
Rinnalülid, also known as pectoral fins, are paired fins located on either side of a fish's body, typically just behind the gill covers. They are homologous to the forelimbs of tetrapods. In most fish, the pectoral fins are used for steering, braking, and maneuvering in the water. They can also be used for propulsion, especially in slower-moving fish or when making sudden turns.
The size, shape, and structure of pectoral fins vary greatly among different fish species, reflecting adaptations
In some species, pectoral fins have been modified for purposes other than locomotion. For example, the pectoral