|Scientific Name:||Coregonus trybomi|
|Species Authority:||Svärdson, 1979|
|Taxonomic Notes:||We retain all the above listed populations (including some winter spawning ones) in C. trybomi. Allozyme data suggest that the different populations have arisen independently from a sympatric population of autumn spawning ciscoes and are distinct species. In this case, three of the four species endemic to Sweden are already extinct.|
|Red List Category & Criteria:||Critically Endangered B1ab(iii,iv)+2ab(iii,iv) ver 3.1|
|Assessor(s):||Freyhof, J. & Kottelat, M.|
|Reviewer(s):||Bogutskaya, N., & Smith, K. (IUCN Freshwater Biodiversity Unit)|
A single known population of the species remains in Lake Fegen (20 km2, area of occupancy probably less than 10 km2 as it is only a deep water species) on the Atran drainage, Sweden. It is already extirpated from Lakes Ören, Hålsjön and Äsunden (1970s and 1980s) probably because of acidification (acid rain) and stocking of alien species (including Sander lucioperca).
The populations from Russia and Finland are most likely not conspecific and are not included in this evaluation (J. Freyhof pers. comm.).
|Previously published Red List assessments:||
|Range Description:||Sweden: Lakes Ören (Motalaström drainage), Hålsjön (Viskan drainage), Äsunden, Fegen (Ätran drainage);
Other populations in Finland (Lakes Änättijärvi, Kostonjärvi, Kokkamo, Pirttijärvi, Suomunjärvi (winter spawning), Sokojärvi, Kajoonjärvi, Luovijärvi, Siikajärvi (spring spawning)) and Russia (some lakes of Karelia (winter spawning; e.g. Korpiselkä)) are most likely not conspecific (Freyhof pers comm.).
Native:Finland; Russian Federation; Sweden
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||The species is no longer present in Lakes Ören (Motalaström drainage), Hålsjön (Viskan drainage), Äsunden.|
|Current Population Trend:||Decreasing|
|Habitat and Ecology:||
Lacustrine, deep water.
Spawns in late April-early May (Sweden), December-January (winter spawning, Finland) or March-May (spring spawning, Finland), at 10-30 m depth. In all lakes, spring spawning C. trybomi occur in sympatry with C. albula. Winter spawning C. trybomi occur with C. albula only in Lake Änättijärvi, Finland. Feeds on plankton. In October-November rises to surface, probably to feed on spawn of C. albula.
|Major Threat(s):||Alien species (including Sander lucioperca) and water pollution from acid rain has caused the extirpation from Swedish lakes.|
|Conservation Actions:||Fishing has now been banned in Lake Fegen for this species.|
|Citation:||Freyhof, J. & Kottelat, M. 2008. Coregonus trybomi. The IUCN Red List of Threatened Species 2008: e.T5383A11126447. http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T5383A11126447.en . Downloaded on 07 October 2015.|
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