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On the sharks that have anal fins, there is usually only one anal fin located on the underneath side of the shark right before the tail. Also like dorsal fins, anal fins help aid in stability in the water. It is situated between the pelvic fins and the tail on the bottom of the body (the ventral side). Pectoral fins the paired pectoral fins are located on each side, usually kept folded just behind the operculum, and are homologous to the forelimbs of tetrapods. A peculiar function of pectoral fins, highly developed in some fish, is the creation of the dynamic lifting force that assists some fish, such as sharks, in maintaining depth and also enables the flight for flying fish. Anal fin synonyms, anal fin pronunciation, anal fin translation, english dictionary definition of anal fin. N a median ventral unpaired fin, situated between the anus and the tail fin in fishes, that helps to maintain stable equilibrium. Not all sharks have an anal fin, but it provides stability for the sharks that do have one. Fins from 14 large-bodied shark species make up roughly 40 of the global fin trade. The oceanic whitetip and three hammerheads in this guide are included in this group and were estimated to constitute 7-9 of traded fins in 2000. The sharpnose is a small, slender shark with 5 gill slits, two dorsal fins, an anal fin, no fin spines, the mouth behind the eyes, and nictitating eyelids. It has a long, sharp snout, black-edged dorsal and caudal fins (which fade with age), and furrowed or wrinkled corners of the mouth. These fins are used for steering during swimming and help to provide the shark with lift. The pelvic fins are located behind the pectoral fins, near the cloaca, and are also stabilizers. Not all sharks have anal fins, but if they do have them, they are found between the pelvic and caudal fins.