Arctic Grayling – Thymallis Arcticus

Reason #53 the Big Hole is unique and important….

It’s the last refuge of native fluvial (river dwelling) arctic grayling in the lower 48 states.

This is critical habitat for a threatened species of concern. Once distributed throughout the upper Missouri River basin (above Great Falls), today’s remnant population exists in a mere 5% of its historic range.

The very presence of this fish speaks to the pristine nature of this place and the amount of intact quality habitat remaining. Threats exist, however.

From low flows, water quality, and temperature issues to habitat loss due to development and degradation, the occupation by this species is just one more motivating factor for protecting and preserving the Big Hole watershed.