The amount of protein in salmon varies by type, but red sockeye salmon contains 23 grams of protein per 3 ounces. King salmon contains 21 grams per 3 ounces, and Coho salmon contains 23 grams per 3-ounce serving.
Most salmon falls in the range of 5 to 7 grams of protein per ounce. The U.S. Department of Agriculture suggests that people over 19 years of age eat 0.37 grams of protein per pound of body weight each day. For example, a man who weighs 180 pounds needs 66 grams of protein per day. Not eating enough protein causes muscle weakness, fatigue and a slower metabolism, which causes weight gain.