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The Atlantic hagfish may grow up to .75 metres (2 + 1 ⁄ 2 ft) long, with no eyes and no jaws; its star-shaped mouth is surrounded by 6 mouth barbels. [3] Their eyes also lack a lens and pigment (features found in the eyes of all other living vertebrates. [4] There is a single gill slit on each side of the eel-like body. [3]
Fishes are a paraphyletic group and for this reason, the class Pisces seen in older reference works is no longer used in formal taxonomy.Traditional classification divides fish into three extant classes (Agnatha, Chondrichthyes, and Osteichthyes), and with extinct forms sometimes classified within those groups, sometimes as their own classes: [1]
The African sharptooth catfish is a large, eel-like fish, usually of dark gray or black coloration on the back, fading to a white belly. In Africa , this catfish has been reported as being second in size only to the vundu of the Zambesian waters, [ 4 ] although FishBase suggests the African sharptooth catfish surpasses that species in both ...
In biological classification, class (Latin: classis) is a taxonomic rank, as well as a taxonomic unit, a taxon, in that rank. It is a group of related taxonomic orders. [a] Other well-known ranks in descending order of size are life, domain, kingdom, phylum, order, family, genus, and species, with class ranking between phylum and order. [1]
Fish physiology is the scientific study of how the component parts of fish function together in the living fish. [2] It can be contrasted with fish anatomy, which is the study of the form or morphology of fishes. In practice, fish anatomy and physiology complement each other, the former dealing with the structure of a fish, its organs or ...
Generally shallow-water fish, tilefish are usually found at depths of 50–200 m in both temperate and tropical waters of the Atlantic, Pacific, and Indian Oceans. All species seek shelter in self-made burrows, caves at the bases of reefs , or piles of rock, often in canyons or at the edges of steep slopes.
The first principle of population dynamics is widely regarded as the exponential law of Malthus, as modelled by the Malthusian growth model.The early period was dominated by demographic studies such as the work of Benjamin Gompertz and Pierre François Verhulst in the early 19th century, who refined and adjusted the Malthusian demographic model.
Juveniles range from 49–72mm (1.9–2.8 inches) and weighing 0.09–0.31 grams. [citation needed] Adults grow up to 1.6 m (5.2 ft) in length and 19 kg (42 lb) in weight. [13] They show signs of negative allometric growth, meaning they get slimmer as they increase in size. [14] The larval fish has an unusual arrangement of nerves in the head. [15]