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.
Thymallus arcticus is a salmonid native to Canada west of Hudson Bay, Alaska and parts of the contiguous U.S., and Russia. The species has been extirpated from parts of its native range in the contiguous U.S., but has now become established in several locations in the contiguous U.S. outside its native range. These established locations are due to intentional stocking programs for sport fishing. T. arcticus is used as a food fish. It is known to host several parasites and carry viral hemorrhagic septicemia. T. arcticus has a high climate match to the contiguous U.S. but somewhat specific habitat requirements, requiring cold well-oxygenated waters and appropriate spawning habitat. Currently, no impacts from introduction of T. arcticus have been documented. Overall risk posed by this species is uncertain.
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Uncertain Risk
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