Pectoral Fins

Pectoral fins - homologous to the tetrapod arm, the pectoral fins are supported by the pectoral girdle. They act as stabilizers and assist the fish in smaller motions and holding position.

Some fishes such as scuplins and lionfishes the pectoral fins are enlarged and used for display, and as in those two examples the fins may have sharp and/or venomous spines for defense.

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