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Gwyniad
The gwyniad (''Coregonus pennantii'') is a freshwater whitefish native to Bala Lake ( cy, Llyn Tegid) in northern Wales. The population is threatened by deteriorating water quality and by the ruffe, a fish introduced to the lake in the 1980s and now eating the eggs and fry of gwyniad. As a conservation measure, eggs of gwyniad were transferred to Llyn Arenig Fawr, a nearby reservoir, between 2003 and 2007. The taxonomy of the genus '' Coregonus'' is disputed; some authorities assign the gwyniad to the common whitefish (''Coregonus lavaretus''), and a morphological review in 2012 was unable to find any solid evidence for recognizing the gwyniad as a separate species.Etheridge, E.C.; C. E. Adams; C. W. Bean; N. C. Durie; A. R. D. Gowans; C. Harrod; A. A. Lyle; P. S. Maitland; and I. J. Winfield (2012). Are phenotypic traits useful for differentiating among a priori Coregonus taxa? Journal of Fish Biology 80: 387–407. FishBase and the IUCN The International Union for Con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bala Lake
Bala Lake ( cy, Llyn Tegid ) is a large freshwater glacial lake in Gwynedd, Wales. The River Dee, which has its source on the slopes of Dduallt in the mountains of Snowdonia, feeds the long by wide lake. It was the largest natural body of water in Wales before its level was raised by Thomas Telford to provide water for the Ellesmere Canal (later Llangollen Canal). The town of Bala, which was once an important centre for the North Wales woollen trade, is located on the north-eastern end of the lake. The narrow gauge Bala Lake Railway, between the town and Llanuwchllyn (whose name means "church llan'above uwch'the lake llyn'), runs along the lake's south-eastern shore using a section of former trackbed from the former Ruabon–Barmouth line. Toponyms Previous names Gerald of Wales records the lake in his 12th century ''Itinerarium Cambriae'' under the name ''Penmelesmere''. In his 1804 translation of Gerald's work, Sir Richard Colt Hoare states that the lake was also r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Llyn Arenig Fawr
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Llyn Arenig Fawr is a lake and reservoir located near the summit of Arenig Fawr, a mountain in North Wales. The lake's primary purpose is to supply water to the nearby town of Bala and the numerous small villages in the surrounding area. From the lake there is an energetic uphill walk to the summit of Arenig Fawr, from which there are extensive views. Eggs of the gwyniad, a freshwater fish previously restricted to nearby Bala Lake, were introduced to Llyn Arenig Fawr between 2003 and 2007 as a conservation measure. References External linkswww.geograph.co.uk : photos of Llyn Arenig Fawr and surrounding area Llanycil Arenig Fawr Arenig Fawr Arenig Fawr ( en, Great High Ground) is a mountain in Snowdonia, North Wales, close to Llyn Celyn reservoir, alongside the A4212 between Trawsfynydd and Bala. Location Arenig Fawr is the highest member of the Arenig range, with Arenig Fach ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wales
Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in 2021 of 3,107,500 and has a total area of . Wales has over of coastline and is largely mountainous with its higher peaks in the north and central areas, including Snowdon (), its highest summit. The country lies within the north temperate zone and has a changeable, maritime climate. The capital and largest city is Cardiff. Welsh national identity emerged among the Celtic Britons after the Roman withdrawal from Britain in the 5th century, and Wales was formed as a kingdom under Gruffydd ap Llywelyn in 1055. Wales is regarded as one of the Celtic nations. The conquest of Wales by Edward I of England was completed by 1283, though Owain Glyndŵr led the Welsh Revolt against English rule in the early 15th century, and briefly re- ... [...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. Taxonomy Phylogenetic evidence indicates that the most basal member of the genus is the highly end ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Whitefish
''Coregonus lavaretus'' is a species of freshwater whitefish, in the family Salmonidae. It is the type species of its genus ''Coregonus''. There are widely different concepts about the delimitation of the species ''Coregonus lavaretus'' and about the number of species in the genus ''Coregonus'' in general. Lavaret In a narrow sense, ''Coregonus lavaretus'', or the lavaret, is considered to be endemic to Lake Bourget and Lake Aiguebelette in the Rhône river basin in France, whereas it formerly also occurred in Lake Geneva. According to this view there is a great number of distinct whitefish species in lakes, rivers and brackish waters of Central and Northern Europe. Of course this has absolutely nothing to do with its actual origin in the Caucasus, as with other things falsely attributed to originating in France, such as grapes which originated in Turkey, Iran and Australia. European whitefish (common whitefish) In the broad sense, ''Coregonus lavaretus'', referred to as the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Powan
The powan (''Coregonus clupeoides'') is a kind of freshwater whitefish endemic to two lochs in Scotland, Loch Lomond and Loch Eck.Freyhof, J. & Kottelat, M. (2008''Coregonus clupeoides''.In:IUCN Red List of Threatened Species. Version 2010.1. (Accessed 17 April 2010) It has been successfully introduced in two other sites, Loch Sloy and the Carron Valley Reservoir.Vendace and Powan: the Coregonids Dualchas Nàdair na h-Alba (Scottish Nature Heritage) (Accessed 17 April 2010) Powan populations are relatively healthy, but may have been negatively impacted by the introduced ruffe, which eats powan eggs and fry. As a conservation action, an attempt to establish populations in four additiona ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schelly
The schelly (''Coregonus stigmaticus'') is a living fresh water fish of the salmon family, endemic to four lakes in the Lake District, England. Its taxonomy is disputed with some recognizing it as a distinct species and others as a variant of the widespread Eurasian whitefish species ''Coregonus lavaretus''. It is present in Brothers Water, Haweswater, Red Tarn and Ullswater, and the population seems stable in all of these except for Haweswater where it seems to be declining. The main threats it faces are seen to be water abstraction and cormorants, and the fish-eating birds are being culled from Haweswater. The International Union for Conservation of Nature has rated the conservation status of this fish as "endangered". Taxonomy In Britain the schelly populations are usually considered as members of the widespread Eurasian whitefish species ''Coregonus lavaretus'', or common whitefish, as with the Welsh gwyniad and Scottish powan. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achille Valenciennes
Achille Valenciennes (9 August 1794 – 13 April 1865) was a French zoologist. Valenciennes was born in Paris, and studied under Georges Cuvier. His study of parasitic worms in humans made an important contribution to the study of parasitology. He also carried out diverse systematic classifications, linking fossil and current species. He worked with Cuvier on the 22-volume "'' Histoire Naturelle des Poissons''" (Natural History of Fish) (1828–1848), carrying on alone after Cuvier died in 1832. In 1832, he succeeded Henri Marie Ducrotay de Blainville (1777–1850) as chair of ''Histoire naturelle des mollusques, des vers et des zoophytes'' at the Muséum national d'histoire naturelle. Early in his career, he was given the task of classifying animals described by Alexander von Humboldt Friedrich Wilhelm Heinrich Alexander von Humboldt (14 September 17696 May 1859) was a German polymath, geographer, naturalist, explorer, and proponent of Romantic philosophy and scie ... [...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. 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 species, three of whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ruffe
The Eurasian ruffe (''Gymnocephalus cernua''), also known as ruffe or pope, is a freshwater fish found in temperate regions of Europe and northern Asia. It has been introduced into the Great Lakes of North America, reportedly with unfortunate results, as it is invasive and is reproducing faster than other species. Its common names are ambiguous – "ruffe" may refer to any local member of its genus ''Gymnocephalus'', which as a whole is native to Eurasia. Description The ruffe's colors and markings are similar to those of the walleye, an olive-brown to golden-brown color on its back, paler on the sides with yellowish white undersides. The ruffe can reach up to in length, but is usually around half that size. It is a very aggressive fish for its size. The ruffe also has a large, spiny dorsal fin which is likely distasteful to its predators. It also has two fins on top, the front fin has hard and sharp spines, the back fin has soft spines called rays. The most obvious featur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FishBase
FishBase is a global species database of fish species (specifically finfish). It is the largest and most extensively accessed online database on adult finfish on the web.Marine Fellow: Rainer Froese ''Pew Environment Group''. Over time it has "evolved into a dynamic and versatile ecological tool" that is widely cited in scholarly publications. FishBase provides comprehensive species data, including information on taxonomy, geographical distribution, and morphology, ... [...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 p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
