Spring spawning cisco
Coregonus trybomi
Coregonus trybomi is a freshwater whitefish in the family Salmonidae. It is a spring-spawning type of cisco, which probably has evolved from sympatric vendace independently in a number of Swedish lakes.
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Countries
Taxonomy & Classification
Kingdom
Animalia
Phylum
Chordata
Order
Salmoniformes
Family
Salmonidae
Genus
Coregonus
Spring spawning cisco belongs to the family Salmonidae, order Salmoniformes, within the unknown class.
Species Profile
Coregonus trybomi is a freshwater whitefish in the family Salmonidae. It is a spring-spawning type of cisco, which probably has evolved from sympatric vendace independently in a number of Swedish lakes. Only one of those populations survives, and it is therefore considered Critically Endangered by the IUCN Red List. The status of Coregonus trybomi as a distinct species is however questionable. By Swedish authorities it is treated as a morphotype or ecotype, not an independent species. It was listed as "Data Deficient" in 2010 but excluded from the national red list in 2015.
Spring spawning cisco faces severe threats from habitat degradation, water pollution, and climate change impacts on cold-water lake ecosystems. The species' specialized spawning requirements and narrow thermal tolerance make it particularly vulnerable to environmental changes and human activities affecting water quality in its limited range.
Key Facts
Habitat & Distribution
Cold, deep oligotrophic lakes and connected waterways in northern Europe, particularly in Finland and surrounding regions. The species requires specific temperature and oxygen conditions for spawning and feeding, typically inhabiting depths of 20-100 meters in clear, nutrient-poor waters.
Threats
IUCN Red List: Critically Endangered
Spring spawning cisco faces severe threats from habitat degradation, water pollution, and climate change impacts on cold-water lake ecosystems. The species' specialized spawning requirements and narrow thermal tolerance make it particularly vulnerable to environmental changes and human activities affecting water quality in its limited range.
Climate change and warming water temperatures
Habitat degradation and loss
Water pollution and eutrophication
Invasive species competition
Overfishing and bycatch
Found in 1 Country
National vs Global Threat Status
How this species is assessed at the national level compared to its IUCN global status (CR).
| Country | National Status | Global Status | Comparison |
|---|---|---|---|
| EU | CRCritically Endangered | CRCritically Endangered | Same |
| EU | CRCritically Endangered | CRCritically Endangered | Same |
National Red List data sourced from the National Red List Project (nationalredlist.org, ZSL) and country-specific Red List authorities.
Community Sightings
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Sources & Attribution
How to Cite
IUCN: IUCN (2025). The IUCN Red List of Threatened Species. Version 2025-1. Available at: https://www.iucnredlist.org. doi:10.2305/IUCN.UK.2025-1.RLTS
GBIF: GBIF.org (2025). GBIF Home Page. Available at: https://www.gbif.org
National Red Lists: ZSL (2025). National Red List. Zoological Society of London. Available at: https://www.nationalredlist.org
This page: SpeciesRadar (2025). Spring spawning cisco (Coregonus trybomi). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/spring-spawning-cisco