National Geographic : 1939 Feb
THE NATIONAL GEOGRAPHIC MAGAZINE wiyiauonal ueograpnic society Fainting by Hashime Murayama AFTER SPAWNING ON GRAVEL BEDS, ALL PACIFIC SALMON DIE On suitable riffles in clear, fresh water, the females scoop out shallow depressions in which the thousands of eggs are deposited. Simultaneously, the males shed their fertilizing milt over the spawn. Aided by the stream, the fish cover their nests with a layer of gravel. Smallest of our Pacific species, the PINK SALMON (Oncorhynchus gorbuscha) spawns in small streams not far above tidewater. Fry of this kind and of the chum salmon (Plate XI) migrate to the sea a few months after emerging from the nests. From the lump on the back of the breeding males, the species is often called "humpback."