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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 ...
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 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.
The anal fin contains three spines, the second spine being very robust, and 9 or 10 soft rays. The pectoral fin is long, clearly greater in length than the pelvic fins, extending to the level of the middle spine of the anal fin. The caudal fin is forked. [7] The adults are silvery to greenish-yellow with olive on the upper body.
A small fleshy fin which lacks fin rays. adnate Joined together. adpressed Pressed against the body. anal fin The fin on the median line behind the vent. anal fin origin The most anterior point of the anal fin base. andropodium A modification of the anal fin of males of certain live-bearing species in the family Goodeidae. It is used to ...
The adipose fin is a soft, fleshy fin found on the back behind the dorsal fin and just forward of the caudal fin. It is absent in many fish families, but found in nine of the 31 euteleostean orders ( Percopsiformes , Myctophiformes , Aulopiformes , Stomiiformes , Salmoniformes , Osmeriformes , Characiformes , Siluriformes and Argentiniformes ...
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]
The anal and pelvic fins are lighter and the caudal fin is dusky with 1 or 2 light-colored bars. The dorsal fins are continuous with the first dorsal fin being marked with black spots close to the tips of the rearmost 3 spines and a white band long its base, while the second dorsal fin is dusky with a number of diagonal white to yellowish bands ...