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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/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 ...
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.
These genera are in two sub-families, Muraeninae and Uropterygiinae, which are distinguished by the location of their fins. [27] In Muraeninae the dorsal fin is near the gill slits and runs down the back of the eel, and the anal fin is behind the anus. [27] In the Uropterygiinnae, both the dorsal and the anal fin are at the end of the tail. [27]
Adults have pointed anal and caudal rays and lack the juvenile trait of blue striping across the body. Instead, they have a white stripe laterally anterior to the head. Sexual dimorphism exists in this species since females tend to have yellow pelvic fins, whereas males tend to have white pelvic fins. The two sexes can also be distinguished by ...
The pelvic fins are small, sometimes vestigial. They are of moderate size, typically around 25 centimetres (9.8 in) in length, and Monodactylus sebae can be taller than it is long, measuring up to 30 centimetres (12 in) from the tip of the dorsal fin down to the tip of the anal fin. These long, scaly fins have given them the name "fingerfishes".
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
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