Fish represent a grade, or paraphyletic group (according to modern classification), which is a type of chordate animals. The group is large, complex, therefore increasing our knowledge about the nature of classification within it have undergone some changes. Consider in what condition it is now, and sturgeon differ from other bony fish.
The content of the article
- Classification of sturgeon and other bony fish
- The difference between sturgeon and other bony fishes
- Comparison table
Classification of sturgeon and other bony fish
Bony fish is the collective name for several classes of fish. Napanee have fins, gills located in the Gill arches, and the mouth formed by jaws with teeth. The earliest remains of the bony fish have a very advanced age, about 425 million years. Bony fish are divided into two groups – ray-finned and lobe-finned, which consist of a large number of living species. Sturgeon are a group of ray-finned fish.
The difference of sturgeon from other bony fish in the first place that a detachment of sturgeon belongs to the subclass of cartilaginous ganoids, that is, the skeleton of these fish is made of cartilage. The most ancient remains of members of this order have an age of 170 million years. Modern sturgeon is represented by two families – the sturgeon and spadefish; and the second family in our country practically does not occur, because it is treated the native inhabitants of freshwater bodies in North America and China. Interestingly, although the skeleton of sturgeon and cartilaginous, they are not included in the class of cartilaginous fish that consists of sharks and rays. The fact that the cartilaginous skeleton of sturgeon is a consequence of adaptation to insufficient buoyancy that it provides a reduced swim bladder, and they differ genetically from the family of cartilaginous fish very much.
to table of contents ↑the Difference between sturgeon and other bony fishes
The representatives of the detachment of sturgeon, there are significant differences that distinguish them from other bony fish. It is primarily cartilage skeleton, which is based on the chord that do not have vertebrae. Insufficient buoyancy kompensiruet great restroom (pridnestrovem Department of the skull) and an increase in the bearing plane with the pectoral fins. Swim bladder they have reduced (reduced), and the mouth is located in the lower part of the head, which is due to pelagic (marine)way of life. There are differences from other bony fish in the structure of the intestines and heart.
As for the gastronomic differences, no wonder the sturgeon has long been nicknamed «the Tsar-fish». The name speaks of itself, samosa: in taste it has no equal. Besides sturgeon and its relatives are good in any form – boiled, fried, baked or salted. Sturgeon caviar – recognized and costly delicacy, the production of which was taken under state control. And in Iran, for example, for illegal extraction of sturgeon poachers, and now cut off his fingers.
to content ↑Comparative table
In a compact table summarizes the difference between sturgeon and other bony fishes.
Other bony fish
The squad included in the class of ray-finned fish belonging to the group of bony fish in the composition of the superclass «Fish». Detachment sturgeon consists of two families of sturgeon and spadefish
The group of classes consisting of a superclass «Fish»
Features of the structure
Reduced swim bladder, enlarged rostrum, cartilaginous skeleton
Full swim bladder filled with gases of the blood vessels; bony skeleton consisting of vertebrae
Meat and eggs of fish are used in cooking. Are a delicacy. Fish protected by the state
Meat and eggs for cooking. The bones of some fish species are ground for use as fertilizer