ABSTRACT 



This report presents physical, chemical, and biological observations by a 3-vessel 

 survey of the portion of the southeastern Pacific Ocean which is centered in the Marquesas Islands. 

 The expedition was conducted during the southern hemisphere summer, January-March 1957. The 

 methods for field collection of data and laboratory analysis of samples are described. The observed 

 data are presented without analysis. The Hugh M. Smith made physical, chemical, and biological 

 observations in order to define the features of the oceanic circulation and describe the distribution 

 and abundance of phytoplankton and zooplankton. The Charles H. Gilbert made a survey of the stocks 

 of tuna available to live-bait fishing in the Marquesas and Tuamotus, and of the tuna-bait resources 

 in the Marquesas. The John R. Manning made a survey of the deep -swimming tunas available to 

 fishing with longline gear. 



