Schelly
| Schelly | |
|---|---|
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| Species: | C. stigmaticus
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| Binomial name | |
| Coregonus stigmaticus (Regan, 1908)
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The schelly (Coregonus stigmaticus) is a freshwater fish of the salmon family, endemic to four lakes in the Lake District, England. Alternatively it is considered either as a species or a subspecies 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.[2][3][4] The schelly is however listed as a distinct species of Coregonus, C. stigmaticus, in FishBase and by the IUCN.[1][5]
Distribution
Schelly is the common name of 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.[1] Apart from Haweswater, the populations appear stable.[1]
Status
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.
References
- ^ a b c d Freyhof, J. & Kottelat, M. (2008) Coregonus stigmaticus In: IUCN Red List of Threatened Species. Version 2010.1.
- ^ Maitland, P. S.; Lyle, A. A.; Barnett, I. K. O. (1990). "Status of the schelly, Coregonus lavaretus (L.), in Red Tarn, Cumbria, England". Journal of Natural History. 24 (4): 1067. doi:10.1080/00222939000770641.
- ^ 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
- ^ Froese, Rainer; Pauly, Daniel (eds.). "Coregonus stigmaticus". FishBase. January 2009 version.
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