Salmon River
Salmon River
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Fish › Whitefish & grayling
Thymallus Arcticus
A rare coldwater salmonid that cruises clear rivers and lakes, often rising to insects.
Size range
14–30 in
Size range
Typical adult length in the waters we cover.
Water temperature
Coldwater
Water temperature
Preferred thermal regime for this species.
Origin
Introduced
Origin
Stocking and native history where this species is found.
Arctic grayling are members of the salmon family and are not native to Idaho; NatureServe lists them as introduced in the state. They are a coldwater fish best known for using clear lakes and medium to large rivers, with fish commonly around 14 inches and capable of reaching about 30 inches.
Young grayling feed on zooplankton and immature insects; adults mostly eat surface insects but will also take eggs, small fish, and crustaceans.
Idaho-specific Arctic grayling fishing guidance was not clearly linked on IDFG pages consulted. Always check the current Idaho fishing seasons and rules for the water you plan to fish.
Regulations vary by water. Check current Idaho Fish and Game rules before fishing.
Status: Introduced to Idaho
G5 (Secure) · ESA: Not listed · Idaho: SNABrowse species profiles with habitat, diet, tactics, and linked waters across the state.
