Report of Results of Albacoro Fishing 

 Ground Development 



Kanagawa Prefecture Fisheries Experiment Station, Msaki Branch 



1. Vessel - Sagami Maru 



2. Type of operations - .Ubacore fishing grounds exploration 



3. Outline of operations 



Survey area Area III 



Date operations began tfay 13, 1939 



Date operations ended October 20, 1939 



First cruise May 16 to June 10 Asst. Tech. Taraura aboard 



Second cruise June 17 to July 1^ Asst. Hattori aboard 



Third cruise Aug. 26 to Sept. 22 Asst. Tech. Tamura aboard 



Fourth cruise Sept, 26 to Oct. 16 Asst. Hattori aboard 



Note: On the fourth cruise there was a case of sudden illness 

 among the crew and the vessel vc.s obliged to breaV: off 

 operations after four stations had been fished and return at 

 high speed to port. 



U, Conditions on the fishing grounds 



First Cruise 



The area investigated on this cruise '.vas between 32*^ 50' - 36° 30 'N 

 and 165" 30' - 173° E. Distribution of irater temperatures 77as such that as 

 the vessel proceeded eastvrard lower temperatur' s vrerc encountered. In the 

 vicinity of 172°E, 36^ 50 'N a point riiere vrarm and cold currents mingled 

 was perceived. 15.thin five to 10 miles to the cast and north the tcmpera- 

 tirre fell by about five degrees and the T.7ator color became unfavorable. The 

 direction of the current was variable and only gentle currents 7;erc detected. 

 Water temperatUT'^ s were 17° to 19° at the surface, and 15.8" to 17.7° at 

 50 meters. 



Second Cruise 



The area surveyed was between 35° - 3^° 30 'N and 16A° - 174° AO'E. 

 On this cruise the line of 17° surface temperatures ans seen to extend r/TITJ 

 and ESE from the vicinity of 37°N, 169°E. E-ter temperatures in the operat- 

 ing area vara 16.4° to 19.5° at the surface, and 14.2° to 18.7° at 50 

 meters. Transparencies were 14 to 22 meters and gentle northeasterly 

 currents were observed. 



Third Cruise 



The area surveyed "/as between 40° 30' - 44° 20 'N and 166° 20' - 173°E, 

 In the western part of this area the v/atcr temperatures were comparatively 

 high, but as the vessel proceeded east'vard '.Tithin the area the temperatures 

 generally dropped, especially marked changes being measured at the 50-metGr 

 level, Water temperatures in the survey area vvere 17,7° to 22,5° at the 

 surface, and 9.5° to 15.5° at 50 meters. Transparencies v/era 16 to 26 motors 

 and there were gentle northerly currents on the surface. 



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