72 Salmonidz 
The flesh is softer than in the other species; it is pale in color, 
and, while of fair flavor when fresh, is distinctly inferior when 
canned. 
The masu, or yezomasu (Oncorhynchus masou), is very similar 
to the humpback, the scales a little larger, the caudal without 
Fic. 56.—Humpback Salmon (female), Oncorhynchus gorbuscha (Walbaum). 
Cook’s Inlet. 
black spots, the back usually immaculate. It is one of the smaller 
salmon, and is fairly abundant in the streams of Hokkaido, 
the island formerly known as Yezo. 
Of these species the blue-back or red salmon predominates 
in Frazer River and in most of the small rivers of Alaska, includ- 
Fic. 57.—Masu (female), Oncorhynchus cae (Brevoort). Aomori, Japan. 
ing all those which flow from lakes. The greatest salmon rivers 
of the world are the Nushegak and Karluk in Alaska, with the 
Columbia River, Frazer River, and Sacramento River farther 
south. The red and the silver salmon predominate in Puget 
Sound, the quinnat in the Columbia and the Sacramento, and 
the silver salmon in most of the smaller streams along the coast. 
All the species occur, however, from the Columbia northward; 
