Is preyed upon by sea lions and halibut. Female dies just before eggs hatch. Larvae are planktonic. Average size 6-15 lbs., up to 30 lbs. Separated from similar appearing king salmon by white gum line and black spots on back and upper lobe of tail.
Mature adults turn reddish black in color and males have a prominent hooked jaw.
Highly valued as a sport fish and fresh-caught troll fish. Young coho require about 18 months rearing in fresh water and return to fresh water as 3 year old adults. Average 15-20 lbs., up to 126 lbs. Black spotting on back and entire tail, black gum line. Mature at 3-6 years.