. Commercial fisheries review. Fisheries; Fish trade. ('Fishery Oceanography IV', CFR, Nov. 1969), enters the ocean in southwestern part of Western Subarctic Gyre. Part of this water, whose properties in the surface layer are strikingly different from those in the Alaskan Stream, is advected cyclonically around the gyre and encounters water from the Stream south of the western Aleutian Islands. The rest continues eastward and mixes with water to the north and south, gradually losing its identifying characteristics. Sockeye Salmon & Their Environment During our early investigations, changes
. Commercial fisheries review. Fisheries; Fish trade. ('Fishery Oceanography IV', CFR, Nov. 1969), enters the ocean in southwestern part of Western Subarctic Gyre. Part of this water, whose properties in the surface layer are strikingly different from those in the Alaskan Stream, is advected cyclonically around the gyre and encounters water from the Stream south of the western Aleutian Islands. The rest continues eastward and mixes with water to the north and south, gradually losing its identifying characteristics. Sockeye Salmon & Their Environment During our early investigations, changes in salmon catch occurred as the vessels pro- ceeded southward from the western Aleutian Islands through the Alaskan Stream and into Western Subarctic water. But our investiga- tions west of long. 175° E. have been limited. Three particularly interesting relations be- tween sockeye salmon and their ocean envi- ronment have been indicated from tagging experiments— (fig. 3): First, the distribution of sockeye salmon of Asian origin appears to be associated with the general extent of West- ern Subarctic Gyre and the distribution of those of Gulf of Alaska origin with Alaskan Gyre. Second, sockeye salmon of Bristol Bay origin move westward in the Alaskan Stream before turning eastward to Bristol Bay; thus they appear to be influenced by this current. Third, there is only a small area of presumed intermingling of Asian and Bristol Bay fish near long. 170° E., the area where water from Alaskan Stream and northern lyKondo, Heihachi, Yoshimi Hirano, Nobuyuki Nakayama, and Makoto Miyake. 1965. Offshore distribution and migration of Pa- cific salmon (genus Oncorhynchus) based on tagging studies (1958-1961). Int. N. Pac. Fish Comm. Bull. 17, 213 pp. 39 branch of Subarctic Current meet. The fore- going suggests not only that these stocks in- habit different environments during their ocean residence, but also that oceanic con- ditions have a significant effect upon salmon-- as well as u
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