Head to head
Arctic Grayling vs Grayling
The Arctic grayling and the grayling found across Europe and parts of Asia look similar enough to be mistaken for the same fish, sharing the same exceptionally large, sail-like dorsal fin, but the two are entirely separate species living on different continents.
| Arctic Grayling | Grayling | |
|---|---|---|
| Scientific name | Thymallus arcticus | Thymallus thymallus |
| Range | Alaska, northern Canada, relict US populations | Europe and parts of Asia |
| Dorsal fin | Exceptionally large, sail-like | Exceptionally large, sail-like |
| Habitat | Cold rivers and lakes | Cold rivers and lakes |
| Range overlap with the other species | None | None |
| Contiguous US population status | Some relict populations lost entirely | Not applicable |
| Conservation status | Least Concern | Least Concern |
| Diet | Insectivore | Carnivore |
Arctic Grayling vs Grayling: common questions
Are the Arctic grayling and the grayling the same fish?
No, despite looking remarkably alike and sharing the same exceptionally large, sail-like dorsal fin, these are two entirely separate species living on different continents, with the Arctic grayling native to Alaska, northern Canada, and isolated parts of the northern contiguous United States, and the grayling native to rivers and lakes across Europe and parts of Asia.
Why do the Arctic grayling and grayling look so similar?
Both species belong to the same genus and share a close evolutionary relationship, which explains their similar large dorsal fin and general body shape, even though long-term geographic isolation on separate continents has kept them as fully distinct species that never naturally interact or interbreed in the wild.
Has the Arctic grayling declined in the United States?
Within the contiguous United States, yes; some historical Arctic grayling populations, such as in Michigan, have disappeared entirely, while others, including a significant population in Montana, now survive only within a greatly restricted range, even though the species remains widespread and secure across Alaska and northern Canada.