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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.
A peculiar function of pectoral fins, highly developed in some fish, is the creation of the dynamic lifting force that assists some fish such as sharks in maintaining depth and also enables the "flight" for flying fish. Certain rays of the pectoral fins may be adapted into finger-like projections, such as in sea robins and flying gurnards.
In modern fishes, the cleithrum is a large bone that extends upwards from the base of the pectoral fin and anchors to the cranium above the gills, forming the posterior edge of the gill chamber. [2] The bone has scientific use as a means to determine the age of fishes. The lobe-finned fishes share this arrangement.
In many fish, the pectoral fins aid in walking, especially in the lobe-like fins of some anglerfish and in the mudskipper (see also walking fish) Certain rays of the pectoral fins may be adapted into finger-like projections, such as in sea robins and flying gurnards; In skates and rays, the pectoral fins are used for propulsion (rajiform ...
Alaska blackfish are small, with an average length of 108 mm (4.3 in), but have been known to reach 330 mm (13 in). [4]They have an easily distinguishable morphology (a branch of biology dealing with the study of the form and structure of organisms and their specific structural features), with relatively large, posterior dorsal fin and anal fins, large, lobed pectoral fins located just ...
The fish is dove- or ash-colored with a body fourteen inches long and five inches deep, excluding the dorsal fin, which can be collapsed into a furrow along the spine. The three spines on the first dorsal fin resemble the lock of a gun, with the rostral spine being the gun cock, and the caudal spine being the trigger.
The small, slender pelvic fins are located underneath the throat and possess a single spine; the large anal fin may have one or two spines. The pectoral fins are greatly enlarged, and the tail fin is rounded. The New Zealand topknot, Notoclinus fenestratus, is the largest species at 20 cm in total length; most other species do not exceed 6 cm.
Pterois brevipectoralis has 13 spines and 10 soft rays in its dorsal fin with 3 spines and 6 soft rays in the anal fin. There are 16, occasionally 15, fin rays in the pectoral fin, these rays are short and do not extend beyond the rear of the base of the dorsal fin. The longest dorsal fin spine is longer than the moderately compressed, oblong ...