Coho salmon are commonly referred to as silver salmon or "silvers". Coho salmon is commercially fished from Northern California to Alaska where it serves as a major commercial fishery for that state. Coho live in the ocean for one to three years. During this time their sides are silver and their back is dark blue. However, during their return to freshwater for spawning they develop red sides and bluish-green heads. They average in size from 6 to 10 pounds and serves as a popular game fish in the Pacific Northwest due to their aggressive nature.