Research Results For 'Ganoid'

ACIPENSER

The acipenser is a genus of cartilaginous ganoid fishes to which the sturgeon belongs.
Research Acipenser

ACTINOPTERYGII

Actinopterygii is a division of bony fishes. The paired fins have broad bases and lack fleshy lobes. External nares are double, internal nares are absent. Scales are of the ganoid type.
Research Actinopterygii

BOWFIN

The bowfin or mud-fish (Amia calva) is a ganoid fish found in still water in the USA. Like its allies it has a well-developed swim-bladder, which functions as a lung, the animal rising to the surface to gulp air.
Research Bowfin

GANOID

The ganoids or Ganoidei are an order of fish. The families of this order are chiefly characterized by angular, rhomboidal, polygonal, or circular scales composed of horny or bony plates covered with a thick plate of glossy enamel-like substance.

The ganoids were most numerous in Paleozoic and early Mesozoic times, but are now represented by seven genera: Lepidosteus, the bony pikes or gar-pikes of the North American fresh-water lakes; Polypterus, represented by a single species occurring in rivers of tropical Africa; Calamoichthys, a similar genus found in Old Calabar; Amia, the fresh-water mud-fish of North America; Acipenser, represented by the sturgeon; Scaphirhynchius, best known by the so-called shovel-nosed sturgeon of the Mississippi basin; and the genus Polyodon or Spatularia, the paddle-fishes of the Mississippi and great rivers of China.
Research Ganoid

HETEROCERCAL

Heterocercal is a term applied to ganoid and elasmobranchiate fishes, in which the vertebral column runs to a point in the upper lobe of the tail, as in the sharks and sturgeons, causing this lobe to be much larger than the other.
Research Heterocercal

PADDLEFISH

The paddlefish (Polyodon spathula) or duck-billed cat, spoonbill sturgeon, is a large American ganoid fish found in the rivers of the Mississippi Valley. It has a long spatula-shaped snout.
Research Paddlefish

STURGEON

The sturgeon (Acipenser) is a large ganoid fish of the order Palaeonisciformes, family Acipenseridae. The species are exclusively inhabitants of the temperate zone of the northern hemisphere, found both sides of the Atlantic, and live either in fresh water or pass a part of the year in rivers to spawn. They are large sluggish fishes reaching a length of three meters, and live on worms, crustaceans and molluscs which they rout out from the bottom with their snout which projects far in advance of the small, toothless mouth.
The skeleton is gristly, not bony, which is partly compensated by the head being encased in hard, bony plates which continue in five longitudinal rows along the body. The tail is heterocercal, the upper lobe being much longer than the lower. The Sturgeon has a single dorsal fin placed far back, only a little in advance of the tail.
The sturgeon is a 'royal fish' in Great Britain, as decreed by an Act of Parliament of Edward II, but the lord mayor of London has claim to those fish taken above London Bridge.
About twenty species of sturgeon are known, half of which occur in Europe. The largest species is Acipenser huso which is found in the Caspian Sea, the Sea of Azov, the Black Sea, the Danube and surrounding areas.
Research Sturgeon

	The Probert Encyclopaedia was designed, edited and programed by Matt and Leela Probert ©1993 - 2009 The Probert Encyclopaedia Southampton, United Kingdom