do this we need a better understanding of the 

 migratory route of the albacore in the North 

 Pacific Ocean. We have provided evidence for 

 a simplified version of a fishery-specific route 

 where the predominant movement of the alba- 

 core is from the North American fishery to the 

 pole-and-line fishery to the longline fishery. 



The migratory route of the albacore and the 

 changes in apparent abundance encourage 

 speculations on the mechanisms of migration 

 and the possible effect of fishing on the genetic 

 constituency of exploited populations which we 

 provide. 



ACKNOWLEDGMENTS 



Many colleagues have read this paper and 

 have made helpful suggestions. In particular 

 we acknowledge the advice of Tamio Otsu, 

 Richard S. Shomura, and Eugene L. Nakamura 

 of the Bureau of Commercial Fisheries Bio- 

 logical Laboratory, Honolulu; Glenn A. Flittner, 

 Bureau of Commercial Fisheries Fishery- 

 Oceanography Center, La JoUa; Akira Suda, 

 Far Seas Fisheries Research Laboratory, Shi- 

 mizu; and David H. Cushing, Fisheries Labora- 

 tory, Lowestoft. 



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36 



