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The anal/cloacal fin is located on the ventral surface behind the anus/cloaca. The bones that support the anal fin are called pterygiophores. There are up to two series, a proximal series (axonosts) and a distal series (baseosts) Most fish use their anal fin to stabilize while swimming; Knifefish use their anal fins for thrust (gymnotiform ...
The tail fin can be rounded at the end, truncated (almost vertical edge, as in salmon), forked (ending in two prongs), emarginate (with a slight inward curve), or continuous (dorsal, caudal, and anal fins attached, as in eels). Anal fins: Located on the ventral surface behind the anus, this fin is used to stabilize the fish while swimming.
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.
ventral fins Paired fins behind or below the pectoral fins. vertical fins Fins on the median line of the body; the dorsal, anal, and caudal fins. vestigial Reduced or very poorly developed. villiform teeth Small, slender teeth forming velvety bands. vomer A bone forming the front part of the roof of the mouth. vomerine teeth Teeth on the vomer.
The anal fin contains 1–4 spines anteriorly and 20–39 soft rays with their height, direction, origin, and terminus mirroring those of the soft dorsal fin. Along the belly are a series of spinous scutes—scales modified into hard, bony plates—forming an armoured ventral keel. Similar scutes also cover the base of the dorsal and anal fins.
The roach is a small fish, often reaching no more than about 35 centimetres (14 in); maximum length is 50 cm (20 in). Its body has a bluish-silvery colour and becomes white at the belly. The fins are red. The number of scales along the lateral line is 39–48. [3] The dorsal and anal fins have 12–14 rays.
There is also another black line running from the base of the dorsal fin to the caudal fin. The gills and ventral area are white. The fins are yellow-orange in color, but at the same time almost transparent. Males have large pectoral, dorsal and anal fins, while females fins are of normal size. The maximum size of fish is 8 cm. [2]
Actinopterygii (/ ˌ æ k t ɪ n ɒ p t ə ˈ r ɪ dʒ i aɪ /; from Ancient Greek ἀκτίς (aktis) 'having rays' and πτέρυξ (ptérux) 'wing, fins'), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish [2] that comprise over 50% of living vertebrate species. [3]