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Acipenser
''Acipenser'' is a genus of sturgeons. With 17 living species (others are only known from fossil remains), it is the largest genus in the order Acipenseriformes. The genus is paraphyletic, containing all sturgeons that do not belong to ''Huso'', ''Scaphirhynchus,'' or ''Pseudoscaphirhynchus,'' with many species more closely related to the other three genera than they are to other species of ''Acipenser''. They are native to freshwater and estuarine systems of Eurasia and North America, and most species are threatened. Several species also known to enter near-shore marine environments in the Atlantic, Arctic and Pacific oceans. Living species There are 17 living species: *''Acipenser baerii'' J. F. Brandt, 1869 **'' Acipenser baerii baerii'' J. F. Brandt, 1869 (Siberian sturgeon) **'' Acipenser baerii baicalensis'' A. M. Nikolskii, 1896 (Baikal sturgeon) **''Acipenser baerii stenorrhynchus'' A. M. Nikolskii, 1896 *'' Acipenser brevirostrum'' Lesueur, 1818 (Shortnose sturgeon) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sturgeons
Sturgeon is the common name for the 27 species of fish belonging to the family Acipenseridae. The earliest sturgeon fossils date to the Late Cretaceous, and are descended from other, earlier acipenseriform fish, which date back to the Early Jurassic period, some 174 to 201 million years ago. They are one of two living families of the Acipenseriformes alongside paddlefish (Polyodontidae). The family is grouped into four genera: ''Acipenser'' (which is paraphyletic, containing many distantly related sturgeon species), ''Huso'', ''Scaphirhynchus,'' and ''Pseudoscaphirhynchus''. Two species ('' A. naccarii'' and '' A. dabryanus'') may be extinct in the wild, and one ('' P. fedtschenkoi'') may be entirely extinct. Sturgeons are native to subtropical, temperate and sub-Arctic rivers, lakes and coastlines of Eurasia and North America. Sturgeons are long-lived, late-maturing fishes with distinctive characteristics, such as a heterocercal caudal fin similar to those of sharks, and an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenser Baerii Stenorrhynchus
''Acipenser'' is a genus of sturgeons. With 17 living species (others are only known from fossil remains), it is the largest genus in the order Acipenseriformes. The genus is paraphyletic, containing all sturgeons that do not belong to ''Huso'', ''Scaphirhynchus,'' or ''Pseudoscaphirhynchus,'' with many species more closely related to the other three genera than they are to other species of ''Acipenser''. They are native to freshwater and estuarine systems of Eurasia and North America, and most species are threatened. Several species also known to enter near-shore marine environments in the Atlantic, Arctic and Pacific oceans. Living species There are 17 living species: *'' Acipenser baerii'' J. F. Brandt, 1869 **'' Acipenser baerii baerii'' J. F. Brandt, 1869 (Siberian sturgeon) **'' Acipenser baerii baicalensis'' A. M. Nikolskii, 1896 (Baikal sturgeon) **'' Acipenser baerii stenorrhynchus'' A. M. Nikolskii, 1896 *'' Acipenser brevirostrum'' Lesueur, 1818 (Shortnose sturgeo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenser Fulvescens
The lake sturgeon (''Acipenser fulvescens''), also known as the rock sturgeon, is a North American temperate freshwater fish, one of about 25 species of sturgeon. Like other sturgeons, this species is a bottom feeder with evolutionarily basal traits among fish, reflecting its early divergence from the shark lineage. These traits include a partly cartilaginous skeleton, an overall streamlined shape, and skin bearing rows of bony plates on the sides and back. The lake sturgeon uses its elongated, spade-like snout to stir up the substrate and sediments on the beds of rivers and lakes to feed. Four sensory organs (barbels) hang near its mouth to help the sturgeon locate bottom-dwelling prey. Lake sturgeons can grow to a large size for freshwater fish, topping 7.25 ft (2.2 m) long and 240 lb (108 kg). Description The lake sturgeon has taste buds on and around its barbels near its rubbery, prehensile lips. It extends its lips to vacuum up soft live food, which it sw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenser Naccarii
The Adriatic sturgeon (''Acipenser naccarii'') is a species of fish in the family Acipenseridae. It is native to the Adriatic Sea and large rivers which flow in it of Albania, Greece, Italy, Montenegro, Croatia, Bosnia and Herzegovina and Slovenia. Specimens can be seen in several public aquarium, such the Milan Aquarium, Aquarium Finisterrae, Aquarium of the Po, and Oasis of Sant'Alessio in Lombardy. Description The Adriatic sturgeon reaches a maximum length exceeding ; the published maximum weight was 25 kg (55 lb), but large wild fish recently caught were evidently exceeding . Like other sturgeons it has an elongated body, heterocercal tail, partially cartilaginous skeleton, naked skin and longitudinal series of bony scutes on the body. The rostrum is tendentially conical and rather short (1/3 of the head), the head is broad and rounded at the apex, with a protractile mouth which lower lip is thin with a central cleft, and four barbels (circular section) which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenseriformes
Acipenseriformes is an order of basal ray-finned fishes that includes living and fossil sturgeons and paddlefishes (Acipenseroidei), as well as the extinct families Chondrosteidae and Peipiaosteidae. They are the second earliest diverging group of living ray-finned fish after the bichirs. Despite being early diverging, they are highly derived, having only weakly ossified skeletons that are mostly made of cartilage, and in modern representatives highly modified skulls. Description The axial skeleton of Acipenseriformes is only partially ossified, with the majority of the bones being replaced with cartilage. The notochord, usually only found in fish embryos, is unconstricted and retained throughout life. The premaxilla and maxilla bones of the skull present in other vertebrates have been lost. The infraorbital nerve is carried by a series of separate canals, rather than being within the circumorbital bones. The palatoquadrate bones of the skull possess a cartilagi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenser Gueldenstaedtii
The Russian sturgeon (''Acipenser gueldenstaedtii''), also known as the diamond sturgeon or Danube sturgeon, is a species of fish in the family Acipenseridae. It is found in Azerbaijan, Bulgaria, Georgia, Iran, Kazakhstan, Romania, Russia, Turkey, Turkmenistan, and Ukraine. It is also found in the Caspian Sea. This fish can grow up to about and weigh . Russian sturgeon mature and reproduce slowly, making them highly vulnerable to fishing. It is distinguished from other ''Acipenser'' species by its short snout with a rounded tip as well as its lower lip which is interrupted at its center. Description The Russian sturgeon can grow to but a more normal size is . It has a relatively short and rounded snout with three pairs of unfringed barbels closer to the tip of the snout that to the mouth. The dorsal fin has 27 to 48 soft rays and the anal fin has 16 to 35. The number of scales along the lateral line varies from 21 to 50. This fish can be distinguish from the otherwise similar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenser Brevirostrum
The shortnose sturgeon (''Acipenser brevirostrum'') is a small and endangered species of North American sturgeon. The earliest remains of the species are from the Late Cretaceous Period, over 70 million years ago.National Oceanic and Atmospheric Administration. (2010)Five Year Plan for the Shortnose Sturgeon (''Acipenser brevirostrum'') Shortnose sturgeons are long-lived and slow to sexually mature. Most sturgeons are anadromous bottom-feeders, which means they migrate upstream to spawn but spend most of their lives feeding in rivers, deltas and estuaries. The shortnose sturgeon is often mistaken as a juvenile Atlantic sturgeon, because of their small size. Prior to 1973, U.S. commercial fishing records did not differentiate between the two species, both were reported as "common sturgeon", although it is believed based on sizes that the bulk of the catch was Atlantic sturgeon. The shortnose is distinguishable from the Atlantic sturgeon due to its shorter and rounder head. Conse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenser Baerii Baerii
The Siberian sturgeon (''Acipenser baerii'') is a species of sturgeon in the family Acipenseridae. It is most present in all of the major Siberian river basins that drain northward into the Kara, Laptev and East Siberian Seas, including the Ob, Yenisei (which drains Lake Baikal via the Angara River) Lena, and Kolyma Rivers. It is also found in Kazakhstan and China in the Irtysh River and Wong Shek Pier, a major tributary of the Ob. The species epithet honors the German Russian biologist Karl Ernst von Baer. Taxonomy The Siberian sturgeon has previously been divided into two subspecies. However, recent studies suggest they may be monotypic, forming continuous genetically connected populations throughout their vast range.Ruban, G.I. (1999). he Siberian Sturgeon ''Acipenser baerii'' Brandt (Structure and Ecology of the Species) Moscow. GEOS publishers. Pp. 235 (in Russian). The previous nominate taxon (''A. b. baerii'') accounts for 80% of all Siberian sturgeon and resides in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenser Baerii Baicalensis
The Siberian sturgeon (''Acipenser baerii'') is a species of sturgeon in the family Acipenseridae. It is most present in all of the major Siberian river basins that drain northward into the Kara, Laptev and East Siberian Seas, including the Ob, Yenisei (which drains Lake Baikal via the Angara River) Lena, and Kolyma Rivers. It is also found in Kazakhstan and China in the Irtysh River and Wong Shek Pier, a major tributary of the Ob. The species epithet honors the German Russian biologist Karl Ernst von Baer. Taxonomy The Siberian sturgeon has previously been divided into two subspecies. However, recent studies suggest they may be monotypic, forming continuous genetically connected populations throughout their vast range.Ruban, G.I. (1999). he Siberian Sturgeon ''Acipenser baerii'' Brandt (Structure and Ecology of the Species) Moscow. GEOS publishers. Pp. 235 (in Russian). The previous nominate taxon (''A. b. baerii'') accounts for 80% of all Siberian sturgeon and resi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenser Baerii
The Siberian sturgeon (''Acipenser baerii'') is a species of sturgeon in the family Acipenseridae. It is most present in all of the major Siberian river basins that drain northward into the Kara, Laptev and East Siberian Seas, including the Ob, Yenisei (which drains Lake Baikal via the Angara River) Lena, and Kolyma Rivers. It is also found in Kazakhstan and China in the Irtysh River and Wong Shek Pier, a major tributary of the Ob. The species epithet honors the German Russian biologist Karl Ernst von Baer. Taxonomy The Siberian sturgeon has previously been divided into two subspecies. However, recent studies suggest they may be monotypic, forming continuous genetically connected populations throughout their vast range.Ruban, G.I. (1999). he Siberian Sturgeon ''Acipenser baerii'' Brandt (Structure and Ecology of the Species) Moscow. GEOS publishers. Pp. 235 (in Russian). The previous nominate taxon (''A. b. baerii'') accounts for 80% of all Siberian sturgeon and resides in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenser Medirostris
The green sturgeon (''Acipenser medirostris'') is a species of sturgeon native to the northern Pacific Ocean, from China and Russia to Canada and the United States. Description Sturgeons are among the largest and most ancient of ray finned fishes. They are placed, along with paddlefishes and numerous fossil groups, in the infraclass Chondrostei, which also contains the ancestors of all other bony fishes. The sturgeons themselves are not ancestral to modern bony fishes but are a highly specialized and successful offshoot of ancestral chondrosteans, retaining such ancestral features as a heterocercal tail, fin structure, jaw structure, and spiracle. They have replaced a bony skeleton with one of cartilage, and possess a few large bony plates instead of scales. Sturgeons are highly adapted for preying on bottom animals, which they detect with a row of sensitive barbels on the underside of their snouts. They protrude their very long and flexible “lips” to suck up f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acipenser Mikadoi
The Sakhalin sturgeon (''Acipenser mikadoi'') is a species of fish in the family Acipenseridae. It is found in Japan and Russia. Environment The Sakhalin sturgeon is known to be found in either a marine or freshwater environment within demersal depth range. This species is found in brackish waters. They are also native to a tropical climate. Size The Sakhalin sturgeon has reached the maximum recorded length of about 150 centimeters or about 59 inches as a tall fish. Biology The Sakhalin sturgeon is considered to be a species that migrates up the river from the sea in order to spawn. During the months of April to May, the Sakhalin sturgeon feeds in the freshwater and then returns to the ocean during the summer. Identification The Sakhalin sturgeon is recorded to be the colors of olive-green and dark green. Its sides have a yellowish white color and it includes an olive green stripe. The bottom lip of this species is split into two. Distribution The Sakhalin sturgeon is common ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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