Coho Salmon (Oncorhynchus kisutch), also referred to as Silver Salmon, are smaller than Chinook but still highly prized by anglers. They typically grow about 28 inches long and weigh up... Coho Salmon (Oncorhynchus kisutch), also referred to as Silver Salmon, are smaller than Chinook but still highly prized by anglers. They typically grow about 28 inches long and weigh up to 36 pounds. Like other Pacific salmon, they are anadromous, migrating from ocean habitats to spawn in the rivers and streams where they were born. Coho are known for their aggressive behavior when hooked and their bright silver coloration.Click here to read more about Coho Salmon.