532 



Fishery Bulletin 101 (3) 



August based on fishery information and as autumn and 

 winter by Bayliff et al. (1991) based on tagging data. The 

 fish observed in our study started its trans-Pacific migra- 

 tion in late autumn. Although data concerning distribution 

 of young Pacific bluefin tuna in the central Pacific Ocean 

 is limited, a record of young Pacific bluefin tuna catch (age 

 1-3, age 1 mainly) in the area of 35^5°N, 150°E-140°W 

 from April to November has been reported (Saito et al.'^). 

 Moreover, two tagged fish were recaptured in the central 

 Pacific Ocean at 38°N, 172°E in June and 39°N, 162°W in 

 June, respectively (Bayliff et al., 1991). Although the sea- 

 sons differ, the path of the fish tagged with an archival tag 

 passed near these locations. The limited data available at 

 present suggest that the trans-Pacific migration route lies 

 in this area. Together with data which would be obtained 

 from future recovery of additional fish tagged with archival 

 tags, we expect that the overall features of trans-Pacific 

 migration to be revealed in the near future. 



Acknowledgments 



We thank the staff of the Marino Forum 21 and the 

 Kagoshima Fisheries Experimental Station for their coop- 

 eration in the pen-held fish experiment. We also thank troll 

 fishermen, staff in the Kamiagata Fisheries Cooperative 

 Association, the Tsushima Fisheries Extension Service, 

 and the Nagasaki Fisheries Experimental Station for their 

 cooperation with tag and release procedures. We acknowl- 

 edge fishermen, consumers, and stafFof the Inter-American 

 Tropical Tuna Commission for their kindness in returning 

 archival tags along with pertinent information about the 

 recapture. We especially thank J. Gunn in CSIRO for giving 

 us valuable information about implanting the archival tag 

 in fish. We are grateful to Northwest Marine Technology Inc. 

 and Tanaka Sanjiro Co., Ltd., for providing us with archi- 

 val tags. We would like to thank P. Ekstrom of Northwest 

 Marine Technology Inc. for his critical review and help with 

 the English text. We thank our staff in Japan NUS Co., Ltd., 

 the Suidosya Co., Ltd., and the National Research Institute 

 of Far Seas Fisheries, and also T Kitagawa in the Ocean 

 Research Institute of the University of Tokyo, for their help 

 in implanting the tags in fish. We gratefully acknowledge S. 

 Kume of Japan NUS Co., Ltd., N. Baba of Fishery Research 

 Agency, and Z. Suzuki and Y. Uozumi of National Research 

 Institute of Far Seas Fisheries for their critical review. 



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