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Pelvic fin. Pelvic fins or ventral fins are paired fins located on the ventral (belly) surface of fish, and are the lower of the only two sets of paired fins (the other being the laterally positioned pectoral fins). The pelvic fins are homologous to the hindlimbs of tetrapods, [ 1 ] which evolved from lobe-finned fish during the Middle Devonian.
The dorsal fins have 10-15 thin spines and 8-22 soft rays while the anal fin contains 3 spines and 9-13 soft rays. The pelvic fins have a single spine and 5 soft rays while the pectoral fins contain 16-24 rays. [8] They can attain a length of up to 60 cm (24 in), though most species only reach about half that length. [7]
Pelvic/Ventral fins: Found in pairs on each side ventrally below the pectoral fins, pelvic fins are homologous to the hindlimbs of tetrapods. They assist the fish in going up or down through the water, turning sharply, and stopping quickly. In gobies, the pelvic fins are often fused into a single sucker disk that can be used to attach to objects.
The pelvic fin assists the fish in going up or down through the water, turning sharply, and stopping quickly. In gobies, the pelvic fins are often fused into a single sucker disk. This can be used to attach to objects [1] Pelvic fins can take many positions along the ventral surface of the fish.
The pectoral and pelvic fins of many reef fish, such as butterflyfish, damselfish and angelfish, have evolved so they can act as brakes and allow complex maneuvers. [39] Many reef fish, such as butterflyfish , damselfish and angelfish , have evolved bodies which are deep and laterally compressed like a pancake, and will fit into fissures in rocks.
Many reef fish, like this queen angelfish, have a body flattened like a pancake, with pectoral and pelvic fins that act with the flattened body to maximize manoeuvrability. In contrast, open water fish like this Atlantic bluefin tuna , are usually streamlined for straightline speed, with a deeply forked tail and a smooth body shaped like a ...
Popeye catalufa. The popeye catalufa (Pristigenys serrula), also known as the bigeye soldierfish, is a species of marine ray-finned fish in the family Priacanthidae, the bigeyes. [2] This fish has an overall dusky orange to red colour with white markings. The dorsal fin appears feathery while rest of fins have black margins. [3]
The largest member of the family, the stone triggerfish (Pseudobalistes naufragium) reaches 1 m (3.3 ft), [8] but most species have a maximum length between 20 and 50 cm (8–20 in). [2] Triggerfish have an oval-shaped, highly compressed body. The head is large, terminating in a small but strong-jawed mouth with teeth adapted for crushing shells.