Three species of Pacific salmon have been introduced to Lake Superior in the past few decades and now reproduce naturally in the lake. All feed in the big lake until they reach sexual maturity. In the fall, all three species swim up rivers to spawn and die, completing their life cycle. The largest salmon is the Chinook Salmon, also called King salmon, which grows to over 10 pounds in Lake Superior, though most catches are around 3 to 4 pounds. Coho Salmon, also called silver salmon, are smaller, averaging about 1.5 to 3 pounds. The smallest at just over a pound is the Pink Salmon, also called humpy (for the large hump on the back that males develop during breeding season).