Head to head
Bull Trout vs Arctic Char
A bull trout and an Arctic char belong to the very same genus of char, yet each has pushed the cold-water lifestyle they share to a different extreme, one demanding the cleanest, coldest mountain streams available, the other simply outlasting every other freshwater fish on the planet at the top of the world.
| Bull Trout | Arctic Char | |
|---|---|---|
| Scientific name | Salvelinus confluentus | Salvelinus alpinus |
| Genus | Salvelinus (char) | Salvelinus (char) |
| Notable extreme | Requires the coldest, cleanest streams nearby | Northernmost freshwater fish on Earth |
| Range | Pacific Northwest of North America | Circumpolar Arctic |
| Adult diet | Mainly fish, unusual for a trout | Fish and invertebrates, varies by population |
| Population history | Continuous native range | Some populations landlocked since the last ice age |
| Migratory behaviour | Some populations migrate seasonally | Some populations anadromous |
| Conservation status | Vulnerable | Least Concern |
Bull Trout vs Arctic Char: common questions
Are the bull trout and Arctic char closely related?
Yes, both belong to the same genus, Salvelinus, the char lineage within the broader salmon family, making them closer relatives to each other than either is to true trout of the genus Salmo or Oncorhynchus, despite the bull trout carrying "trout" in its common name.
Which of these two fish lives in colder water?
The Arctic char can spawn successfully in water temperatures close to freezing and holds the title of northernmost freshwater fish species on Earth, an even more extreme cold tolerance than the bull trout, which requires very cold, clean streams within its Pacific Northwest range but does not approach the near-freezing conditions some Arctic char populations tolerate.
Why is the bull trout considered more at risk than the Arctic char?
The bull trout is federally listed as threatened largely because its narrow, specific requirement for cold, clean streams makes it highly vulnerable to stream warming, habitat fragmentation, and competition from introduced trout within a limited Pacific Northwest range, while the Arctic char remains widespread across a vast circumpolar Arctic range where suitably cold habitat is still abundant overall.