Arctic Grayling (Thymallus arcticus)
Last Update/Review: August 6, 2002
These fish have a colorful and very large dorsal fin, much larger than that of any other cold-water fish. Grayling have large scales with brown or black spots on the body behind the head. They have a black line in the fold under the mouth.
The Arctic grayling is native to North America, and is found primarily in the Athabasca, Hay and Peace river drainage systems of Alberta. There is also a small population in the Belly River in southwestern Alberta. The Arctic grayling is typically found in streams and rivers.
Spawning occurs from May to June, depending on the area. Grayling migrate from lakes and larger rivers to smaller streams to spawn. The males on the spawning ground are territorial and will drive away other males when confronted. Actual spawning occurs during daylight. Intense quivering by both the male and female, as the eggs and milt are deposited, displaces some of the bottom material and buries some of the fertilized eggs. No actual nest is built. After spawning, Arctic grayling return to the lakes and larger rivers. The eggs hatch quickly, 13 to 18 days after being deposited.
The Arctic grayling's diet consists of a wide range of both aquatic and terrestrial invertebrates. Fish eggs and small fish may also supplement the diet.
