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It is situated between the pelvic fins and the tail on the bottom of the body (the ventral side). The animal swishes this fin from side to side in order to propel its entire body forwards. Most sharks have eight fins a pair of pectoral fins, a pair of pelvic fins, two dorsal fins, an anal fin, and a caudal fin. The members of the order hexanchiformes have only a single dorsal fin. The anal fin is absent in the orders squaliformes, squatiniformes, and pristiophoriformes. Shark fins are supported by internal rays called ceratotrichia. Sharks all have a pair of dorsal fins, a pair of pectoral fins, a pair of ventral fins, and a caudal fin. Some different species of shark also have a singular anal fin. Understanding how to recognize each type of fin and how they help a shark navigate through the water is crucial to understanding the biology of sharks. Cartilaginous fishes are a class of fishes called chondrichthyes. Shark fin skeletons are elongated and supported with soft and unsegmented rays named ceratotrichia, filaments of elastic protein resembling the horny keratinin hair and feathers. Originally the pectoral and pelvic girdles, which do not contain any dermal elements, did not connect. The spiny dogfish, spurdog, mud shark, or piked dogfish (squalus acanthias) is one of the best known species of the squalidae (dogfish) family of sharks, which is part of the squaliformes order. While these common names may apply to several species, squalus acanthias is distinguished by having two spines (one anterior to each dorsal fin) and lacks an anal fin. Shark finning is the act of removing fins from sharks and discarding the rest of the shark, back into the ocean. The sharks are often still alive when discarded, but without their fins. Unable to swim effectively, they sink to the bottom of the ocean and die of suffocation or are eaten by other predators. Shark finning at sea enables fishing vessels to increase profitability and increase the. Anal fin synonyms, anal fin pronunciation, anal fin translation, english dictionary definition of anal fin. Key differences a spinner shark has a black-tipped anal fin, while the blacktip, in spite of its name,. Shark fins are rigid not flexible, and are supported by rods made of cartilage. The sicklefin lemon shark (negaprion acutidens) or sharptooth lemon shark, is a species of requiem shark belonging to the family carcharhinidae, widely distributed in the tropical waters of the indo-pacific. Brevirostris) of the americas the two species are almost identical in appearance, both being stout-bodied sharks with broad heads.