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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. Anglerfish - Wikipedia

    en.wikipedia.org/wiki/Anglerfish

    Most adult female ceratioid anglerfish have a luminescent organ called the esca at the tip of a modified dorsal ray (the illicium or fishing rod; derived from Latin ēsca, "bait"). The organ has been hypothesized to serve the purpose of luring prey in dark, deep-sea environments, but also serves to call males' attention to the females to ...

  5. 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 ...

  6. 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 ...

  7. 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.

  8. 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.

  9. Longlure frogfish - Wikipedia

    en.wikipedia.org/wiki/Longlure_frogfish

    The illicium is the first spine of the dorsal fin, highly modified into a long rod with a lure at the end. In most species, the esca looks like potential prey, such as a worm, crustacean, or even a fish. The frogfish will lie in a sponge and wait for a fish to swim by. It will then wiggle the lure around to attract the prey.