GEOGRAPHIC DISTRIBUTION OF THE PACIFIC SALMON 
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(1934), Schott (1935), Thompson and Van Cleve (1936), and Wiist (1936). Since it 
is known that the salmon mature in the offshore waters and begin their spawning 
migration there, more emphasis was laid upon the general movements in these waters 
than upon the local and complex shiftings along the immediate shores. 
The Japan, or Kurosliio Current; Bering Sea, or Oyashio Current; Okhotsk Sea 
Current, and other less perceptible currents form an intricate maze of water move- 
Figure I. —The geographic distribution of the Pacific salmon and the directional drifts of ocean currents during the spawning 
migration period of the salmon. The bars indicate the native distribution of the salmon, the solid black areas indicate the 
regions in which the salmon have been transplanted successfully, and the dots indicate the regions in which the transplantations 
were unsuccessful. The directional drifts of the ocean currents in the Northern Hemisphere are means calculated from the 
monthly averages of June, July, August, and September, and in the Southern Hemisphere are means calculated from the monthly 
averages of January, February, and March. A, Japan or Kuroshio Current and West Wind Drift; B, North Equatorial Current; 
C, Okhotsk Sea Current; D, Bering Sea, Oyashio or East Kamchatka Current; E, West Australian Current; F, East Australian 
Current; H, South Equatorial Current; J, South Pacific Current and Antarctic Drift; K, Peruvian or Humboldt Current; 
N, East Greenland Current; P, Labrador Current; E, Irminger Current; S, Gulf Stream or Florida Current; T, Canaries 
Current; U, North Equatorial Current; V, South Equatorial Current; W, Brazil Current; X, Benguela Current; Y, Falkland 
Current; Z, South Atlantic Current and Antarctic Drift. 
ments iu the North Pacific. The Japan Current has the most outstanding circulation. 
It is a tropical drift originating from the North Equatorial Current off the east shore 
of the Philippine Islands. From here it flows northward and strikes the shores of the 
Islands of Japan. Part is forced to the west of the islands and enters the Japan Sea. 
The bulk, however, closely follows the east shore of Honshu Island to Cape Inuboye 
just east of Tokyo. Here it is met by the Bering Sea Current of arctic origin which 
