Species that are considered uncertain risk need a more in-depth assessment beyond the Risk Summary to better define the species’ risk to U.S. environments.
The Maraena Whitefish, Coregonus maraena, is a fish species native to northern Europe with anadromous and land-locked populations. An introduction to the United States in the late nineteenth century failed to establish. All species in the family Salmonidae are listed as injurious species in the United States due to the risk of carrying certain pathogens, thus prohibiting their importation unless imported live with a health certification or are dead and eviscerated. Introductions to other countries outside its native range have sometimes resulted in established populations, although they are often supported through continued stocking. C. maraena has hybridized with nonnative Coregonus peled in the Czech Republic, with detrimental effects on juvenile and adult mortality of the hybrids. The history of invasiveness is classified as Data Deficient despite the hybridization between C. maraena and C. peled because it is an impact on another nonnative species and not on a native species, the economy, or the environment. The overall climate match for the contiguous United States was High, with high match found in throughout the Great Lakes region and the Rocky Mountains. The certainty of assessment is Low because of the lack of impacts of introductions on native species. The overall risk assessment category for Coregonus maraena is Uncertain.
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Uncertain Risk
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