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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
It has three dorsal and two anal fins. Types of caudal fin: heterocercal (A), protocercal (B), homocercal (C), and diphycercal (D) Sharks possess a heterocercal caudal fin. The dorsal portion is usually larger than the ventral portion. The high performance [definition needed] bigeye tuna is equipped with a homocercal caudal fin, finlets and keels.
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 caudal fin is strongly divided and rigid, with a slender, ridged base. The first (spiny) dorsal fin and the pelvic fins are normally retracted into body grooves. Species lengths vary from the 20 cm (7.9 in) of the island mackerel to the 4.58 m (15.0 ft) recorded for the immense Atlantic bluefin tuna.
This sustainably caught canned tuna 85 mg of sodium, 2.5 grams of fat and isn’t made with any fillers or broth. It's a great choice for salads or sandwiches where you really want the tuna flavor ...
(1) pectoral fins (paired), (2) pelvic fins (paired), (3) dorsal fin, (4) adipose fin, (5) anal fin, and (6) caudal (tail) fin. Aristotle recognised the distinction between analogous and homologous structures , and made the following prophetic comparison: "Birds in a way resemble fishes.
A 276-kilogram bluefin tuna that was auctioned for 207 million Japanese yen (about $1.3 million) is carried into an Onodera sushi restaurant after the first tuna auction of the New Year in Tokyo ...