This is Rick Baker of Fish Kodiak Adventures. He's another one of our favorite guides in Alaska and he is holding an Alaskan Dolly Varden Trout. Check out the white on the edges of the fins. That is an easy indicator of a Dolly Varden. They also have beautiful spots on their sides. Here is a more scientific description:

Dolly Varden (Salvelinus malma Walbaum) are locally abundant in all coastal waters of Alaska. Two basic forms of Dolly Varden occur in Alaska waters. The southern form ranges from lower Southeast Alaska to the tip of the Aleutian Chain, and the northern form is distributed on the north slope drainages of the Aleutian Range northward along Alaska’s coast to the Canada border. Anadromous and freshwater resident varieties of both forms exist with lake, river, and dwarf populations being found among the freshwater residents. Little is known of the habits of Alaskan nonmigratory Dolly Varden.

General description: Young Dolly Varden have about eight to ten wide, dark parr marks or oval blotches which contrast with the mottled olive-brown color of their body. The sea-run fish are silvery with an olive-green to brown color on the dorsal surface and numerous red to orange spots on their sides. The mature males become brilliant red on the lower body surface and the lower fins become reddish-black with white along the leading edges. Mature females are similar but are less brightly colored. Males develop an extended lower jaw which hooks upward, fitting into a groove which is formed in the upper jaw. A hook also forms in the females but is considerably less developed.

Dolly Varden belong to a group of fish called char. The light spots on their sides distinguish them from most trout and salmon which are usually black spotted or speckled.