Steelhead are a type of fish belonging to the Salmonidae family, specifically the species Oncorhynchus mykiss. They are anadromous, meaning they are born in freshwater, migrate to the ocean, and return to freshwater to spawn. Steelhead are known for their silvery skin and can grow up to 30 inches long, making them popular among anglers. These fish are primarily found along the Pacific coast of North America, from Alaska to California. Steelhead are often confused with rainbow trout, as they are the same species but have different life cycles. They are valued for their fighting ability and are a sought-after target for sport fishing.