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The pinhead pearlfish is a slender, tapering, eel-like fish that can grow to a length of 30 cm (12 in). It has very small eyes and near the jaws are star-shaped melanophores which are more numerous in older specimens. This fish has no scales or pelvic fins, but does have short pectoral fins and an elongated dorsal fin with 31 to 42 soft rays.
Agnatha (/ ˈ æ ɡ n ə θ ə, æ ɡ ˈ n eɪ θ ə /; [3] from Ancient Greek ἀ-(a-) 'without' and γνάθος (gnáthos) 'jaws') is a paraphyletic infraphylum [4] of non-gnathostome vertebrates, or jawless fish, in the phylum Chordata, subphylum Vertebrata, consisting of both living (cyclostomes) and extinct (conodonts, anaspids, and ostracoderms, among others).
The immaculate puffer is a pufferfish and has a rounded body with a short tail. They have no scales or clear lateral line. They are grey or light brown, though they have the ability to change this to a mottled grey-green coloration presumably used for camouflage. [2] The lips and iris of the immaculate pufferfish are yellow. The caudal fin is ...
Sticklebacks are carnivorous, feeding on small animals such as insects, crustaceans and fish larvae. [8] [9] Sticklebacks are characterised by the presence of strong and clearly isolated spines in their dorsal fins. [10] An unusual feature of sticklebacks is that they have no scales, although some species have bony armour plates.
The pelvic fins consist of just a spine and one ray. All spines can be locked in an erect position, making the fish extremely hard to swallow by a predator. The pectoral fins are large, with 10 rays. The body bears no scales, but is protected by bony plates on the back, flanks, and belly. Only one ventral plate is present, but the number of ...
A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the use of reflection and colouration, as well as possible hydrodynamic advantages.
This species commonly grows to approximately 70 cm in length, however the largest individuals have been found to be 87 cm. [clarification needed] It is yellow to yellowish-brown or bronze in colour, the belly being lighter. It has scattered blue markings over the body. The cheeks have no scales and may have a vertical blue markings. [8]
Several species of deep-sea fish have luminous organs used to attract prey. Females of the genus Linophryne bear barbels containing luminous organs in addition to an escal light organ attached to the head. In L. arborifera, the top light organ has been likened to a pearl onion and contains luminous bacteria. The barbels, which look like seaweed ...