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schelly
The schelly (''Coregonus stigmaticus'') is a designation for four populations of freshwater whitefish in the English Lake District, Cumbria. The native populations of this fish inhabit the Brothers Water, Haweswater, Red Tarn and Ullswater, and occupy a total area of about 20 square kilometers.〔 Apart from Haweswater, the populations appear stable.〔
At Haweswater, the fishery officers are now culling all of the cormorants that visit the lake, in order to protect the endangered fish. An analysis of reservoir management data over a 30-year period (1961–1991) has revealed that the decline of the schelly population is associated with increased water abstraction and reduced water levels. Entrapment during abstraction is not significant. Year class strength is probably determined by lake levels during the January–March spawning and incubation period whereas subsequent growth rate is influenced by lake levels during June–October.
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.〔(Vendace and Powan: the Coregonids ) Dualchas Nàdair na h-Alba (Scottish Nature Heritage) (Accessed 17 April 2010)〕〔Etheridge E.C (2009) (Aspects of the conservation biology of ''Coregonus lavaretus'' in Britain. ) PhD Thesis. University of Glasgow〕 The schelly is however listed as a distinct species of ''Coregonus'', ''C. stigmaticus'', in FishBase and by the IUCN.〔
==References==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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