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Beloribitsa
''Stenodus leucichthys'' is a species of freshwater whitefish in the family Salmonidae. In the strict sense its natural distribution is restricted to the Caspian Sea basin, and it is known as beloribitsa (literally meaning "the fish that is white" in Russian). The beloribitsa is now considered extinct in the wild, but survives in cultured stocks. The nelma (''Stenodus nelma''), a more widespread species of Eurasian and North America, is sometimes considered its subspecies. Systematics Alternatively, the name ''Stenodus leucichtys'' has been used in a broader sense, referring to a widespread species composed of two subspecies. 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. Nelma, also known as the sheefish or inconnu, is currently often considered as a distinct species ''Stenodus nelma''. At a higher leve ... [...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 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 ty ...'' is not clearly evident. References Sources * Ray-finned fish genera Taxa named b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salmonidae
Salmonidae is a family of ray-finned fish that constitutes the only currently extant family in the order Salmoniformes . It includes salmon (both Atlantic and Pacific species), trout (both ocean-going and landlocked), chars, freshwater whitefishes, graylings, taimens and lenoks, which are collectively known as the salmonids ("salmon-like fish"). The Atlantic salmon (''Salmo salar''), whose Latin name became that of its genus '' Salmo'', is also the source of the family and order names. Salmonids have a relatively primitive appearance among the 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 scales and forked tails, and their mouths contain a single row of sharp teeth. Although the smallest species is just long as an adult, most are much larger, with the largest reaching . All salmonids spawn in fresh water of upper reaches of rivers and creeks, but in many cases, the fish spend ... [...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.Eschmeyer FCatalog of Fishes(Search: Stenodus (species)) California Academy of Sciences. (15 March 2012 version) 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Anton Güldenstädt
Johann Anton Güldenstädt (26 April 1745 in Riga, Latvia – 23 March 1781 in St. Petersburg, Russia) was a Baltic German naturalist and explorer in Russian service. Güldenstädt lost both his parents early, and from 1763 onwards studied pharmacy, botany and natural history in Berlin. At the age of 22, he obtained his doctorate in medicine at the University of Frankfurt in 1767. In the following year, he joined the Russian Imperial Academy of Sciences' expedition sent by Catherine II of Russia to explore the Russian empire's southern frontier. Güldenstädt travelled through Ukraine and the Astrakhan region, as well as the northern Caucasus and Georgia, both of which were almost entirely beyond the borders of the Russian empire. In March 1775 he returned to St Petersburg. The results of the expedition and Güldenstädt's edited expedition journal were published after his death by Peter Simon Pallas in ''Reisen durch Russland und im Caucasischen Gebürge'' (Travels in Russ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Predator
Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill the host) and parasitoidism (which always does, eventually). It is distinct from scavenging on dead prey, though many predators also scavenge; it overlaps with herbivory, as seed predators and destructive frugivores are predators. Predators may actively search for or pursue prey or wait for it, often concealed. When prey is detected, the predator assesses whether to attack it. This may involve ambush or pursuit predation, sometimes after stalking the prey. If the attack is successful, the predator kills the prey, removes any inedible parts like the shell or spines, and eats it. Predators are adapted and often highly specialized for hunting, with acute senses such as vision, hearing, or smell. Many predatory animals, both vertebra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Fish Of The Arctic
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include non- salty mineral-rich waters such as chalybeate springs. Fresh water may encompass frozen and meltwater in ice sheets, ice caps, glaciers, snowfields and icebergs, natural precipitations such as rainfall, snowfall, hail/ sleet and graupel, and surface runoffs that form inland bodies of water such as wetlands, ponds, lakes, rivers, streams, as well as groundwater contained in aquifers, subterranean rivers and lakes. Fresh water is the water resource that is of the most and immediate use to humans. Water is critical to the survival of all living organisms. Many organisms can thrive on salt water, but the great majority of higher plants and most insects, amphibians, reptiles, mammals and birds need fresh water to survive. Fresh wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IUCN
The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natural resources. It is involved in data gathering and analysis, research, field projects, advocacy, and education. IUCN's mission is to "influence, encourage and assist societies throughout the world to conserve nature and to ensure that any use of natural resources is equitable and ecologically sustainable". Over the past decades, IUCN has widened its focus beyond conservation ecology and now incorporates issues related to sustainable development in its projects. IUCN does not itself aim to mobilize the public in support of nature conservation. It tries to influence the actions of governments, business and other stakeholders by providing information and advice and through building partnerships. The organization is best known to the wider ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terek River
The Terek (; , Tiyrk; , Tərč; , ; , ; , ''Terk''; , ; , ) is a major river in the Northern Caucasus. It originates in the Mtskheta-Mtianeti region of Georgia and flows through North Caucasus region of Russia into the Caspian Sea The Caspian Sea is the world's largest inland body of water, often described as the List of lakes by area, world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad s .... It rises near the juncture of the Greater Caucasus Mountain Range and the Khokh Range, to the southwest of Mount Kazbek, winding north in a white torrent between the town of Stepantsminda and the village of Gergeti toward the Russian region North Ossetia and the city of Vladikavkaz. It turns east to flow through Chechnya and Dagestan before Water divide, dividing into two branches which empty into the Caspian Sea. Below the city of Kizlyar it forms a swampy river delta around wide. The river is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ural (river)
The Ural (russian: Урал, ), known before 1775 as Yaik (russian: Яик, ba, Яйыҡ, translit=Yayıq, ; kk, Жайық, translit=Jaiyq, ), is a river flowing through Russia and Kazakhstan in the continental border between Europe and Asia. It originates in the southern Ural Mountains and discharges into the Caspian Sea. At , it is the third-longest river in Europe after the Volga and the Danube, and the List of the longest Asian rivers, 18th-longest river in Asia. The Ural is conventionally considered part of the boundary between the continents of Europe and Asia. The Ural arises near Mount Kruglaya in the Ural Mountains, flows south parallel and west of the north-flowing Tobol, through Magnitogorsk, and around the southern end of the Urals, through Orsk where it turns west for about , to Orenburg, where the river Sakmara (river), Sakmara joins. From Orenburg it continues west, passing into Kazakhstan, then turning south again at Oral, Kazakhstan, Oral, and meandering thro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volga
The Volga (; russian: Во́лга, a=Ru-Волга.ogg, p=ˈvoɫɡə) is the longest river in Europe. Situated in Russia, it flows through Central Russia to Southern Russia and into the Caspian Sea. The Volga has a length of , and a catchment area of «Река Волга» , Russian State Water Registry which is more than twice the size of . It is also Europe's largest river in terms of average at delta – between and – and of |
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. Taxonomy Phylogenetic evidence indicates that the most basal member of the genus is the highl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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