When woolly mammoths still roamed Earth, rain and snow fell on the south side of Alaska’s Brooks Range. Those same ancient waters are just now entering frozen rivers on Alaska’s North Slope via perennial springs. And they hold the key to survival for salmon-sized Dolly Varden and several other species of fish in Arctic National Wildlife Refuge.

Read more about Alaska's North Slope Dolly Varden and what we know: 

Ancient Rivers Give Fish Life

New Insights into the Biology of Anadromous Dolly Varden in the Canning River, Arctic National Wildlife Refuge, Alaska



The U.S. Fish and Wildlife Service manages an unparalleled network of public lands and waters called the National Wildlife Refuge System. With more than 560 refuges spanning the country, this system protects iconic species and provides some of the best wildlife viewing opportunities on Earth.
The Fish and Aquatic Conservation program leads aquatic conservation efforts for the U.S. Fish and Wildlife Service. We are committed to tackling the nation’s highest priority aquatic conservation and recreational challenges to conserve, restore, and enhance fisheries for future generations.


Based in Fairbanks, and in collaboration with our Utqiaġvik (Barrow) Satellite Office, we work with others to deliver conservation over approximately 338-million acres of Alaska. Our responsibilities generally range from the Yukon River Delta region in southwest Alaska, eastward to the Canadian...

Library Collections

Fish and Wildlife Conservation Offices specialize in providing fish population information. This data is critical for managing fisheries and assessing management strategies. Data is collected by tagging and recapturing fish, monitoring angler harvest, and even tracking the DNA they behind leave in...