It also serves as a nursery for the largest red salmon run in the world. The Kvichak River is home to the largest red salmon run in the world. Species such as the Rainbow Trout, King Salmon, Red Salmon and Coho Salmon. These are mostly Sockeye Salmon or red salmon found in profusion. The Kvichak River has the single largest red salmon run in the world. It was based on the book "Red Salmon, Brown Bear" by Theodore J. Walker. Red salmon spend half of their 5-year lifespan in fresh water. For 2012, king salmon were estimated at 5,173, while red salmon were estimated at 1,581,555.