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Stenodus
''Stenodus'' is a genus of large-sized whitefish in the family Salmonidae. It consists of two species; one of them ( beloribitsa) is extinct in the wild. The two species have alternatively been considered subspecies of the single species ''Stenodus leucichthys''. Species * '' Stenodus leucichthys'' — beloribitsa: the Caspian Sea basin * '' Stenodus nelma'' — nelma, sheefish or inconnu: rivers of the Arctic basin. Systematics The genus ''Stenodus'' is distinctive from other whitefishes due to its size and specialized predator morphology; however, evidence of independence from the broader freshwater whitefish genus ''Coregonus ''Coregonus'' is a diverse genus of fish in the salmon family (Salmonidae). The ''Coregonus'' species are known as whitefishes. The genus contains at least 68 described extant taxa, but the true number of species is a matter of debate. The type ...'' is not clearly evident. References Sources * Ray-finned fish genera Taxa named ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stenodus Leucichthys
''Stenodus leucichthys'', also known as the inconnu, sheefish, ''ak balyk'', or ''beloribitsa'', is a species of large, anadromous, freshwater whitefish in the family Salmonidae. In the strict sense its natural distribution is restricted to the Caspian Sea basin. It was formerly considered extinct in the wild, but survives in cultured stocks. The nelma (''Stenodus nelma''), a more widespread species of Eurasia and North America, is sometimes considered its subspecies. Systematics Alternatively, the name ''Stenodus leucichtys'' has previously been used in a broader sense, referring to a widespread species composed of two subspecies, which if true would make it the sole extant representative of the '' Stenodus'' genus. In addition to the landlocked subspecies ''Stenodus leucichthys leucichthys'', it comprises the nelma, ''Stenodus leucichthys nelma'' (Pallas, 1773) which lives in Eurasian and North American rivers of the Arctic basin. Despite this designation, nelma, similar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beloribitsa
''Stenodus leucichthys'', also known as the inconnu, sheefish, ''ak balyk'', or ''beloribitsa'', is a species of large, anadromous, freshwater whitefish in the family Salmonidae. In the strict sense its natural distribution is restricted to the Caspian Sea basin. It was formerly considered extinct in the wild, but survives in cultured stocks. The nelma (''Stenodus nelma''), a more widespread species of Eurasia and North America, is sometimes considered its subspecies. Systematics Alternatively, the name ''Stenodus leucichtys'' has previously been used in a broader sense, referring to a widespread species composed of two subspecies, which if true would make it the sole extant representative of the '' Stenodus'' genus. In addition to the landlocked subspecies ''Stenodus leucichthys leucichthys'', it comprises the nelma, ''Stenodus leucichthys nelma'' (Pallas, 1773) which lives in Eurasian and North American rivers of the Arctic basin. Despite this designation, nelma, similarly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nelma
''Stenodus nelma'', known alternatively as the nelma, sheefish, siifish, inconnu or connie, is a commercial species of freshwater whitefish in the family Salmonidae. It is widespread in the Arctic rivers from the Kola Peninsula (White Sea basin) eastward across Siberia to the Anadyr River and also in the North American basins of the Yukon River and Mackenzie River. Appearance and lifestyle ''Stenodus nelma'' is an anadromous fish, up to in length. The fish has a large mouth with a protruding lower jaw and a high and pointed dorsal fin. It is generally silver in color with a green, blue or brown back. The meat is white, flaky and somewhat oily. An adult fish weighs up to . The fish eat plankton for their first year of life and then become predators of smaller fish. They live in lakes and rivers and in the brackish water at the outlets of rivers into the ocean. They may migrate more than to their upriver spawning grounds, but some populations spend their entire life in fresh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stenodus
''Stenodus'' is a genus of large-sized whitefish in the family Salmonidae. It consists of two species; one of them ( beloribitsa) is extinct in the wild. The two species have alternatively been considered subspecies of the single species ''Stenodus leucichthys''. Species * '' Stenodus leucichthys'' — beloribitsa: the Caspian Sea basin * '' Stenodus nelma'' — nelma, sheefish or inconnu: rivers of the Arctic basin. Systematics The genus ''Stenodus'' is distinctive from other whitefishes due to its size and specialized predator morphology; however, evidence of independence from the broader freshwater whitefish genus ''Coregonus ''Coregonus'' is a diverse genus of fish in the salmon family (Salmonidae). The ''Coregonus'' species are known as whitefishes. The genus contains at least 68 described extant taxa, but the true number of species is a matter of debate. The type ...'' is not clearly evident. References Sources * Ray-finned fish genera Taxa named ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Whitefish
The freshwater whitefish are fishes of the subfamily Coregoninae, which contains whitefishes (both freshwater and anadromous) and ciscoes, and is one of three subfamilies in the salmon family Salmonidae. Apart from the subfamily Coregoninae, the family Salmonidae includes the salmon, trout, and char species of the subfamily Salmoninae, and grayling species of the subfamily Thymallinae. Freshwater whitefish are distributed mainly in relatively cool waters throughout the northern parts of the Northern Hemisphere. Taxonomy The Coregoninae subfamily consists of three nominal genera: * '' Coregonus'' Linnaeus, 1758 – whitefishes and ciscoes, which according to some authors number more than 60 species. There are differing opinions on the classification of some species within the genus and the overall number of species. Some species in Arctic regions of Asia and North America forage in marine waters. * '' Prosopium'' Jordan, 1878 – round whitefishes, which includes six speci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coregonus
''Coregonus'' is a diverse genus of fish in the salmon family (Salmonidae). The ''Coregonus'' species are known as whitefishes. The genus contains at least 68 described extant taxa, but the true number of species is a matter of debate. The type species of the genus is '' Coregonus lavaretus''. Most ''Coregonus'' species inhabit lakes and rivers, and several species, including the Arctic cisco (''C. autumnalis''), the Bering cisco (''C. laurettae''), and the least cisco (''C. sardinella'') are anadromous, moving between salt water and fresh water. Many whitefish species or ecotypes, especially from the Great Lakes and the Alpine lakes of Europe, have gone extinct over the past century or are endangered. Among 12 freshwater fish considered extinct in Europe, 6 are ''Coregonus''. All ''Coregonus'' species are protected under appendix III of the Bern Convention,Council of Europe, 1979. Convention on the Conservation of European Wildlife and Natural Heritage. Be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salmonidae
Salmonidae (, ) is a family (biology), family of ray-finned fish, the only extant member of the suborder Salmonoidei, consisting of 11 extant genera and over 200 species collectively known as "salmonids" or "salmonoids". The family includes salmon (both Atlantic and Pacific species), trout (both ocean-going and landlocked), Salvelinus, char, Thymallus, graylings, freshwater whitefishes, taimens and lenoks, all coldwater fish, coldwater mid-trophic level, level predatory fish that inhabit the subarctic and cool temperate waters of the Northern Hemisphere. The Atlantic salmon (''Salmo salar''), whose Latin name became that of its genus ''Salmo'', is also the eponym of the family and order names. Salmonids have a relatively primitive appearance among teleost fish, with the pelvic fins being placed far back, and an adipose fin towards the rear of the back. They have slender bodies with rounded fish scale, scales and forked caudal fin, tail fins, and their fish jaw, mouths contain a si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct In Wild
A species that is extinct in the wild (EW) is one that has been categorized by the International Union for Conservation of Nature as only consisting of living members kept in captivity or as a naturalized population outside its historic range. Classification requires exhaustive surveys conducted within the species' known habitat with consideration given to seasonality, time of day, and life cycle.IUCN. (2003). Guidelines for Application of IUCN Red List Criteria at Regional Levels: Version 3.0'' IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, UK. ii + 26 pp. Once a species is classified as EW, the only way for it to be downgraded is through reintroduction. Not all EW species are rare. An example is the ''Brugmansia'' genus, where all seven species are widely cultivated, but none are found in the wild. Ultimately, the purpose of preserving biodiversity is to maintain ecological function to prevent ecological extinction. Examples Examples of species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caspian Sea
The Caspian Sea is the world's largest inland body of water, described as the List of lakes by area, world's largest lake and usually referred to as a full-fledged sea. An endorheic basin, it lies between Europe and Asia: east of the Caucasus, west of the broad steppe of Central Asia, south of the fertile plains of Southern Russia in Eastern Europe, and north of the mountainous Iranian Plateau. It covers a surface area of (excluding the highly saline lagoon of Garabogazköl to its east), an area approximately equal to that of Japan, with a volume of . It has a salinity of approximately 1.2% (12 g/L), about a third of the salinity of average seawater. It is bounded by Kazakhstan to the northeast, Russia to the northwest, Azerbaijan to the southwest, Iran to the south, and Turkmenistan to the southeast. The name of the Caspian Sea is derived from the ancient Iranian peoples, Iranic Caspians, Caspi people. The sea stretches from north to south, with an average width of . Its gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
