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There are three pairs of muscles each on the dorsal and ventral side of the pelvic fin girdle that abduct and adduct the fin from the body. [citation needed] Pelvic fin structures can be extremely specialized in actinopterygians. Gobiids and lumpsuckers modify their pelvic fins into a sucker disk that allow them to adhere to the substrate or ...
Anal/cloacal fin 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
The pectoral fins act as pivots around which the fish can turn rapidly and steer itself. The paired pectoral and pelvic fins control pitching, while the unpaired dorsal and anal fins reduce yawing and rolling. The caudal fin provides raw power for propelling the fish forward. [3]
The first dorsal fin has three spines, the second dorsal fin has between 25 and 28 rays (mode: 27), the anal fin has between 23 and 25 rays (mode: 24), the pectoral fins have either fifteen or sixteen rays each (mode: 15), and the caudal fin has twelve rays. The pelvic fin in this species is rudimentary and has been reduced to a single rayless ...
The dorsal fin has 13 spines and 13 to 14 soft rays. The anal fin has 2 spines and 14 soft rays; the first anal spine is half the size of the second. The first ray of the pelvic fins is much elongated, and is longer than the head. The pectoral fins are rather shorter, and the caudal fin is shallowly forked with rounded lobes. [1]
Acanthopterygians likewise usually have: ctenoid scales; an evidently symmetrical tail fin kept up by fused basal elements; maxilla excluded from the gape; a physoclistous gas bladder; anal and pelvic fins with spines; two apparent and evident dorsal fins wherein the first one is spiny while the second one is soft-rayed; pelvic fins located ...
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.
There is one anal fin, two spines overall, and between 27 and 30 soft rays on it. The pectoral and pelvic fins are two of its paired fins. The pectoral fin contains 17–18 soft rays and 0 spines. The pelvic fin has a single spine and three soft rays. In adult males, the lobe's apex produces a lengthy filament. Caudal fin is lunate or crescent ...