Olympic mudminnow

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Olympic mudminnow
Three Novumbra hubbsi.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Esociformes
Family: Umbridae
Genus: Novumbra
L. P. Schultz, 1929
Species: N. hubbsi
Binomial name
Novumbra hubbsi
L. P. Schultz, 1929

The Olympic mudminnow (Novumbra hubbsi) is a fish native to the western lowlands of Washington: the Chehalis River basin, Deschutes River basin, and some Olympic Peninsula basins.[2] It grows to 8 cm (about 3 in) in length, and is Washington's only known endemic freshwater fish species. Although they strongly resemble killifish, mudminnows are more closely related to pike and muskellunge.

The Olympic mudminnow is the only species in genus Novumbra, and one of seven species worldwide in the family Umbridae. It resides in dark areas in the bottom of the river, living on fish larvae, eggs, and small invertebrates. It prefers areas with mudbeds and dense vegetation, and has a remarkable tolerance for low oxygen levels. The Olympic mudminnow is listed as a sensitive species by the state of Washington. Although many populations are found, the range is limited, and suitable habitat is easily lost to development.[3][4][5]


  1. ^ NatureServe (2013). "Novumbra hubbsi". IUCN Red List of Threatened Species. Version 2014.3. International Union for Conservation of Nature. Retrieved 30 January 2015. 
  2. ^ Froese, Rainer and Pauly, Daniel, eds. (2012). "Novumbra hubbsi" in FishBase. February 2012 version.
  3. ^ WDFW site: sensitive species list
  4. ^ Mongillo, P., and M. Hallock. 1999.Washington state status report for the Olympic mudminnow. Washington Department of Fish and Wildlife, Olympia, WA.
  5. ^ Washington Department of Fish and Wildlife site: status report