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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 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.
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 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 ...
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.
A muskie will have seven or more per side, while the northern pike never has more than six. The lobes of the caudal (tail) fin in muskellunge come to a sharper point, while those of northern pike are more generally rounded. In addition, unlike pike, muskies have no scales on the lower half of their opercula. [citation needed]
There is a single dorsal fin located mid-body and a deeply forked tail-fin. Their bodies are compressed laterally, and ventral scales protrude in a somewhat serrated fashion. Unlike other genus members, they have no scales on heads or gills; [4] moreover, their scales are large and easy to extract. This species of fish may attain a length of 45 ...
They have either smooth scales or no scales, a long dorsal fin and an anal fin that typically runs into the caudal fin. They mostly come from the tropics and subtropics, and live in both freshwater and marine habitats, including abyssal depths. They have adopted a range of feeding methods and lifestyles, including parasitism.