ABSTRACT 



This report contains the biological and oceanographic data collected during five cruises in the 

 central North Pacific by the Bureau of Commercial Fisheries research vessels Hugh M. Smith and 

 Charles H. Gilbert. Participating scientists collected oceanographic and biological data designed to 

 determine the distribution of surface water types and the associated biota, particularly skipjack tuna 

 Katsuwonus pelamis (Linnaeus). The area investigated was between longitudes 155* and 170° W. at 

 latitudes 15° to 26° N. 



