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  2. Fish anatomy - Wikipedia

    en.wikipedia.org/wiki/Fish_anatomy

    The two to three bones that support the dorsal fin are called the proximal, middle, and distal pterygiophores. In spinous fins, the distal pterygiophore is often fused to the middle or not present at all. Caudal/Tail fins: Also called the tail fins, caudal fins are attached to the end of the caudal peduncle and used for propulsion.

  3. Fish fin - Wikipedia

    en.wikipedia.org/wiki/Fish_fin

    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 rod and lure; The bones that support the dorsal fin are called pterygiophores.

  4. Oarfish - Wikipedia

    en.wikipedia.org/wiki/Oarfish

    The dorsal fin originates from above the (relatively large) eyes and runs the entire length of the fish. Of the approximately 400 dorsal fin rays, the first 10 to 13 are elongated to varying degrees, forming a trailing crest embellished with reddish spots and flaps of skin at the ray tips. The pelvic fins are similarly elongated and adorned ...

  5. Dorsal fin - Wikipedia

    en.wikipedia.org/wiki/Dorsal_fin

    The shape, size, position and colour of the dorsal fin varies with the type of billfish, and can be a simple way to identify a billfish species. For example, the white marlin has a dorsal fin with a curved front edge and is covered with black spots. [4] The huge dorsal fin, or sail, of the sailfish is kept retracted most of the time. Sailfish ...

  6. Chimaera - Wikipedia

    en.wikipedia.org/wiki/Chimaera

    There are two dorsal fins: a large triangular first dorsal fin and a low rectangular or depressed second dorsal fin. For defense, some chimaeras have a venomous spine on the front edge of the dorsal fin. [4] In many species, the bulbous snout is modified into an elongated sensory organ, capable of electroreception to find prey.

  7. Polydactylus sexfilis - Wikipedia

    en.wikipedia.org/wiki/Polydactylus_sexfilis

    The caudal fin is deeply forked and its lobes are non-filamentous, although they are long. The simple lateral line has 60 to 67 pored scales and runs from the upper end of the gill slit to the upper end of the lower lobe of the caudal fin. The head and flanks are tinged silvery brown dorsally, becoming silvery on their lower flanks.

  8. Remora - Wikipedia

    en.wikipedia.org/wiki/Remora

    The sucking disc begins to show when the young fish are about 1 cm (0.4 in) long. When the remora reaches about 3 cm (1.2 in), the disc is fully formed and the remora can then attach to other animals. The remora's lower jaw projects beyond the upper, and the animal lacks a swim bladder. [9] Some remoras associate with specific host species.

  9. Gnathostomata - Wikipedia

    en.wikipedia.org/wiki/Gnathostomata

    Chondrichthyes (cartilage-fish) or cartilaginous fishes are jawed fish with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone. The class is divided into two subclasses: Elasmobranchii ( sharks , rays and skates ) and Holocephali ( chimaeras , sometimes called ghost sharks ...