Most return to fresh water to spawn in their fourth or fifth year. Salmon Ranging along the Pacific Coast from northern California to Kotzebue Sound, silvers are recognized by black spots on the back and top lobe of the tail, and a light gray gum line. Tail spots are quite variable, and the pale gum line is restricted mostly to a line along which teeth emerge. Salmon Smallest of the five species of Pacific salmon. Distinguished by very small scales and large very dark oval spots on back and entire tail.
Tail lacks iridescent sheen found on king salmon.
Males on spawning migration develop a high hump immediately behind the head, suggesting the common name, humpy or humpback. Breeding male has pale green head, dark jaws, and bright red body and fins. Spawning female is generally the same with green and yellow splotches ori the body. In fresh water, spawning fish show reddish or dark streaks or bars, and large pale blotches. Flesh of the fish is pale pink, and the base of the tail is relatively slender.