Other names: King Salmon, Tyee Salmon, Spring Salmon. Chinook salmon are the largest of the Pacific salmon species. Chinook salmon can grow as large as 53 inches and weigh over 100 pounds but usually average 30-40 inches and weigh between 20-40 pounds. They closely resemble and are often confused with coho salmon in ocean and spawning coloration (Figs. 1 and 3 vs 4 and 6). Chinook and coho salmon both have small black spots on the back and dorsal fin. However, distinguishing characteristics for chinook salmon include spots on both lobes of the caudal fin, and black gum coloration in the mouth at the base of the teeth (Fig. 2). Chinook are strong fighters and highly prized by anglers.