Map_thumbnail_large_font

Coregonus trybomi

Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_offStatus_en_offStatus_cr_onStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA ACTINOPTERYGII SALMONIFORMES SALMONIDAE

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.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii,iv)+2ab(iii,iv) ver 3.1
Year Published: 2008
Date Assessed: 2008-01-01
Assessor/s: Freyhof, J. & Kottelat, M.
Reviewer/s: Bogutskaya, N., & Smith, K. (IUCN Freshwater Biodiversity Unit)
Justification:
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.).
History:
1996 Data Deficient

Geographic Range [top]

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.).
Countries:
Native:
Finland; Russian Federation; Sweden
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The species is no longer present in Lakes Ören (Motalaström drainage), Hålsjön (Viskan drainage), Äsunden.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: Habitat:
Lacustrine, deep water.

Biology:
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.
Systems: Freshwater

Threats [top]

Major Threat(s): Alien species (including Sander lucioperca) and water pollution from acid rain has caused the extirpation from Swedish lakes.

Conservation Actions [top]

Conservation Actions: Fishing has now been banned in Lake Fegen for this species.
Citation: Freyhof, J. & Kottelat, M. 2008. Coregonus trybomi. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 20 April 2014.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please fill in the feedback form so that we can correct or extend the information provided