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  2. Dorsal fin - Wikipedia

    en.wikipedia.org/wiki/Dorsal_fin

    Dorsal fin of a shark. A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom.Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments ...

  3. Fish fin - Wikipedia

    en.wikipedia.org/wiki/Fish_fin

    Dorsal fin of a chub (Squalius cephalus) The dorsal fins are located on the back. A fish can have up to three dorsal fins. The dorsal fins serve to protect the fish against rolling, and assist it in sudden turns and stops. In anglerfish, the anterior of the dorsal fin is modified into an illicium and esca, a biological equivalent to a fishing ...

  4. Shark anatomy - Wikipedia

    en.wikipedia.org/wiki/Shark_anatomy

    Fins allow the sharks to be able to guide and lift themselves. 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. Pectoral fins are stiff, which enables downward movement, lift, and guidance. The members of the order Hexanchiformes have only a single

  5. Fish anatomy - Wikipedia

    en.wikipedia.org/wiki/Fish_anatomy

    Dorsal fins: Located on the back of the fish, dorsal fins serve to prevent the fish from rolling and assist in sudden turns and stops. Most fishes have one dorsal fin, but some fishes have two or three. In anglerfish, the anterior of the dorsal fin is modified into an illicium and esca, a biological equivalent to a fishing rod and lure.

  6. Fin - Wikipedia

    en.wikipedia.org/wiki/Fin

    A fin is a thin component or appendage attached to a larger body or structure. [1] Fins typically function as foils that produce lift or thrust, or provide the ability to steer or stabilize motion while traveling in water, air, or other fluids. Fins are also used to increase surface areas for heat transfer purposes, or simply as ornamentation ...

  7. Glossary of ichthyology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_ichthyology

    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

  8. Enormous shark fin spotted off Florida coast revealed to be a ...

    www.aol.com/news/enormous-shark-fin-spotted-off...

    According to biologists, the dorsal fin’s size in such shallow water should reveal part of the shark’s back or a second dorsal fin — neither of which are visible.

  9. Hybodontiformes - Wikipedia

    en.wikipedia.org/wiki/Hybodontiformes

    Hybodont teeth served a variety of functions depending on the species, including grinding, crushing , tearing, clutching, and even cutting. [4] Hybodonts are characterized by having two dorsal fins each preceded by a fin spine. The fin spine morphology is unique to each hybodont species.