Report of Re3'7.!'.i-.F! nf Derslopnenr. of Albacore 



Aoraorl Prefecture Fisheries Experiment Station 



1. Vessel - Aomori Maru 



2. Type of operation - albacore fishing ground exploration 



3. Outline of operations 



In this year's investigations the Aomori Maru was assigned to the sur- 

 vey of Area I. In order to enable the vessel to underur'^e such long voyages 

 she was put in the Asano docks at Yokohama on Aprix 20 fcr repairs to the 

 hull and engine. She came out of the dockyard on June 3 and proceeded to 

 Hachinoe harbor where all preparations for fishi'.r.n- were Tr^ide. On Jure 21 

 the vessel left Hachinoe on its first cruise aaJ on November 12 she returned 

 to Misaki completing her third cruise and marking the end of the year's 

 operations. 



First Cruise 



The vessel sailed from Hachinoe harbor on June 21 and arrived on the 

 fishing grounds July 3. Twelve fishing trials were made in the area between 

 171° W and 176° E and 33° - 37*^ N. The catch was 38 albacore, S3 big-eyed, 

 23 striped marlin, 165 Galeus glaucus, 5 L ampris regia, 1 black marlin, 1 

 Scoliodon walbechmi, 6 Isurus nlaucus . and 2 broadbill swordflsh. The 

 vessel was on the way back to Misaki, but the schedule was changed en route 

 and she put in at Katsuure in Chiba Prefecture where most of the catch was 

 sold. The remainder was sold at Hachinoe. The value of the landings was 

 ¥ 1,907. 



Second Cruise 



The vessel departed Hachinoe for the fishing grounds on September 3, 

 but returned without fishing because of engine trouble en route. She 

 arrived back at Hachinoe on the 25th of September. 



Third Cruise 



The vessel departed Hachinoe Oetober 5 and put in at Xamaishi for fuel. 

 On October 7 at 6:00 P.M. she sailed from Kamaishi for the fishing grounds. 



From October 20 to October 31 11 fishing operations were carried out 

 in the area between 38° - /^lo n and 173° 1 - 11U° E. The catch comprised 

 1,615 albacore, 16 big-eyed tuna, 2 bro".dbill, 2 striped marlin, 7 Isurus 

 glaucus . and 96 Galeus glaucu s. This catch, the landed value of which v^as 

 ¥ 6,A,66, provided a successful ending to the season's operations. 



A.. Conditions on the fishing grounds 



On the first cruise the c'lrrcnts on the fishing grounds were gener.'illy 

 northeasterly or easterly with speeds of about one knot. Albacore were 

 taken at places where the water temprrature was 19-21°, vdth a water color 

 of l^. and a transparency of about 18 meters, but no albacore were found at all 



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