ABSTRACT 



This report contains the biological and oceanographic data collected on three cruises in the 

 central North Pacific of the U.S. Bureau of Commercial Fisheries research vessel Charles H. Gilbert 

 in 1961. The collection of data was designed to determine the distribution of surface water types and 

 associated biota, particularly skipjack tuna, Katsuwonus pelamis (Linnaeus). The area investigated 

 was between longitudes 150° W. and 170° W. and latitudes 15° N. and 24° N. The data presented com- 

 prise records of observations at bathythermograph lowerings, meteorological observations, zoo- 

 plankton station positions, and weights of samples (g./l,000 m.3), records of sightings of fish schools , 

 bird flocks, and aquatic mammals, surface trolling catch records, and skipjack tagging records. 



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