Coregonus trybomi is a freshwater whitefish

Coregonus

Coregonus is a diverse genus of fish in the salmon family . The type species is the common whitefish . The Coregonus species are known as whitefishes...

 in the Salmonidae

Salmonidae

Salmonidae is a family of ray-finned fish, the only living family currently placed in the order Salmoniformes. It includes salmon, trout, chars, freshwater whitefishes and graylings...

 family, described by Gunnar Svärdson in 1979. It is a spring-spawning type of cisco

Cisco (fish)

The ciscoes are salmonid fish of the genus Coregonus that differ from other members of the genus in having upper and lower jaws of approximately equal length and high gillraker counts...

, which probably has evolved from sympatric vendace

Vendace

Vendace can refers to several species of fish, but especially these species of freshwater whitefish:*Coregonus albula, widespread in northern continental Europe...

 (Coregonus albula) independently in a number of Swedish

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

 lakes. Only one of those populations survives, and it is therefore considered Critically Endangered

Critically Endangered

Critically Endangered is the highest risk category assigned by the IUCN Red List for wild species. Critically Endangered means that a species' numbers have decreased, or will decrease, by 80% within three generations....

 by the IUCN Red List

IUCN Red List

The IUCN Red List of Threatened Species , founded in 1963, is the world's most comprehensive inventory of the global conservation status of biological species. The International Union for Conservation of Nature is the world's main authority on the conservation status of species...

. The status of Coregonus trybomi as a distinct species is however questionable.