Are pelvic fins supported by spines in a fish?

Pelvic fins in fishes are not supported by spines. Pelvic fins are paired fins located on the ventral side of the body, typically behind the pectoral fins. They are primarily used for stability, maneuvering, and balance. The structure and composition of pelvic fins can vary among different fish species, but they are generally supported by bony rays called lepidotrichia or actinosts. These rays are flexible and provide support for the fin membrane. In some fish species, the pelvic fins may be modified or absent, depending on their specific adaptations and modes of locomotion.