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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 ...
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 ...
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 ...
Well developed fins are used for maintaining balance, braking and changing direction. 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 queen angelfish has a broad, flattened, oval-shaped body with triangular tail fin, a reduced, dulled snout and a small mouth containing bristle-like teeth. [13] [6] The dorsal fin contains 14 spines and 19–21 soft rays, and the anal fin has 3 spines and 20–21 soft rays. [2] The dorsal and anal fins both dangle behind the body. [6]
A small fin, positioned behind the dorsal or anal fins, that is supported by a ray or rays. fluviatile Living in rivers. free rear tips (of fins) The posterior tip of the fin that is closest to the most posterior point of the fin base. frontal ridge A ridge running along the top of the head along the midline. furcate Forked. fusiform
This means the fish has 14 spiny rays (bones) in the first part of its dorsal fin (D), followed by 10 soft rays. A is the anal fin, P represents the pectoral fins (near the gills and eyes), V represents the ventral or pelvic fins, and C is the caudal fin or tail (not indicated in this example). GR means gill raker count (see below).
The anal fin has 3 spines and 11 or 12 soft rays, the base of the anal fin is roughly equal in length to the second dorsal-fin base. The pectoral fin has 15 or 16 rays, and this fin has a length which is equal to 20 to 23% of the standard length , and its tip does not reach the tip of pelvic fin ; almost all the rays of the pectoral fin are ...
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