Knowra Pelvic fin Pelvic fin A pelvic fin is one of a fish’s paired fins on its underside. Its position and structure vary among fish, and it can aid stability, steering, braking, or movement.
Paired fins : Fins occurring as left–right pairs on fishes, principally the pectoral and pelvic fins. Pelvic fins are one of the two main pairs of fins in fishes.
Fish locomotion : The ways fishes move through water using body undulations, fins, or both. Pelvic-fin movements contribute to locomotion alongside body and other fin movements.
Gobies : A diverse group of small fishes, many of which live near the bottom in marine or freshwater habitats. Many gobies use pelvic fins fused into a suction disc to cling to surfaces.
Paired appendage : One of two corresponding lateral structures, such as a vertebrate limb or a fish fin. Pelvic fins belong to the broader evolutionary pattern of paired appendages.
Fin ray : A slender skeletal support in a fish fin, formed from bone or cartilage. Fin rays support the flexible membrane of many pelvic fins.
Hydrodynamic stability : Resistance to unwanted rotation or displacement as a body moves through a fluid. Pelvic fins can help stabilize a fish while it swims or hovers.
Remoras : Marine fishes that attach to larger animals using a suction disc on the head. Their pelvic fins contribute to a second adhesive disc behind the head.
Tetrapod hindlimb : The rear limb of a four-limbed vertebrate, including its bones, joints, and muscles. Tetrapod hindlimbs are evolutionarily related to the pelvic fins of lobe-finned fishes.
Fin spine : A stiff, usually unsegmented skeletal element that supports or protects a fish fin. Some pelvic fins contain spines instead of, or alongside, soft rays.
Fish maneuverability : A fish’s ability to change direction, position, or speed over short distances. Pelvic fins can assist steering and precise position control.
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