research vessels in the landbased fishing area 

 or from the Japanese mothership fishing fleet. 

 Figure 3 illustrates the vertical distribution 

 of cold water originating from the Western 

 Subarctic Domain. Along long. 170° E. above 

 200 m., the vertical range of water lower than 

 3° C. was less in 1968 than in 1967. Also, 

 there was an absence of water lower thaa2° C. 

 in 1968. Figure 4 shows that no temperatures 

 lower than 3.5° C. were observed above 125 m. 

 and south of 50° N. along long. 175° E. in 1968. 

 In 1968, the 5° C. isotherm was near 46° N. 



along long. 170° E. (fig. 3), whereas in 1967 

 the water at 46° N. was much colder and the 

 5° isotherm was 2 degrees farther south. These 

 data show that warm water from the south 

 extended relatively far to the .north in 1968 

 and the cold water originating from the West- 

 ern Subarctic Domain did not extend as far 

 east in 1968 as in 1967. 



The temperature and salinity structure along 

 175° W. and the temperature structure along 

 long. 177°30' W. are shown in figures 5 and 6, 

 which illustrate the range of the Alaskan 



55°N. 



I60°E. I65°E. I70°E. I75°E. 180° I75°W. I70°W. I65°W. 



I60°W. 



50°N. 



45°N. - 



40°N. 

 55°N. 



I60°E. I65°E. I70°E 



I75°E. I80 e 



T 



I75°W. I70°W. 



^r — 



50°N 



45°N.- 



40°N. 



Figure 2.— Temperature (° C.) at 100-m. depth, spring 1967 and 1968. 



3 



