OCEANOGRAPHIC AND BIOLOGICAL DATA, HAWAIIAN WATERS, 



JANUARY - OCTOBER, 1959 



By 



Kenneth Sherman, Fishery Research Biologist 



and 



Robert P. Brown, Oceanographer 



Bureau of Commercial Fisheries Biological Laboratory 



Honolulu, Hawaii 



During 1959 there were five cruises in 

 the central Pacific area between latitude 15° N. 

 and 26° N., longitude 145° W. to 170° W. (table 

 1; fig. 1) by research vessels of the Bureau of 

 Commercial Fisheries Biological Laboratory, 

 Honolulu, Hawaii. 



The purpose of these cruises was two- 

 fold: (1) to delineate the boundaries between the 

 North Pacific Central, the zone of intermediate 

 salinity, and the North Pacific Equatorial water 

 types-i/; and (2) to monitor the seasonal move- 

 ments of those boundaries and of the associated 

 marine biota , particularly the skipjack tuna , 

 Katsuwonus pelamis (Linnaeus). 



The present report contains a record of 

 observed physical and biological data from the 

 five 1959 cruises. They are presented without 

 analysis . 



FIELD PARTY PERSONNEL 



Hugh M. Smith - Robert E. K. D. Lee, Acting 

 Master 



Cruise 50 



Gunter R. Seckel, Field Party Chief 

 Daniel T. Yamashita, Fishery Research 

 Biologist 



\J Seckel (1961, in press) discusses the dif- 

 ference between water masses, as described by 

 Sverdrup et al. (1942, ch. 15), and water types. 

 He states, "The chief distinction between water 

 types and masses is that the former are under 

 the direct influence of the physical processes tak- 

 ing place at the sea surface whereas the latter are 

 not. One would therefore expect relatively large 

 seasonal temperature and salinity changes in the 

 surface water types. The position of their bound- 

 aries would also be subject to changing wind 

 stresses, so that they would not always coincide 

 with the corresponding water mass boundaries . " 



Arthur O. Oishi, Fishery Aid 



Cruise 51 



Herbert H. Shippen, Field Party Chief 

 Walter M. Matsumoto, Fishery Research 



Biologist 

 Fred Hertlein, Physical Science Aid 



Charles H. Gilbert -William T. Tanaka, Master 

 Cruise 44 



Kenneth D. Waldron, Field Party Chief 

 Herbert H. Shippen, Fishery Research 



Biologist 

 Fred Hertlein, Physical Science Aid 



Cruise 45 



Donald W. Strasburg, Field Party Chief 



Eugene L. Nakamura, Fishery Research 

 Biologist 



Reginald M. Gooding, Fishery Research 

 Biologist 



Robert A. Stevenson, Jr., Fishery Re- 

 search Biologist 



Heeny S. H. Yuen, Fishery Research 

 Biologist 



Richard J. Hansen, Fishery Aid 



Cruise 46 



Eugene L. Nakamura, Field Party Chief 

 (Sept. 15-16) 



Donald W. Strasburg, Field Party Chief 

 (Sept. 17-28) 



Richard S. Shomura, Field Party Chief 

 (Sept. 29-Oct. 18) 



Robert A. Stevenson, Jr., Fishery Re- 

 search Biologist 



Daniel T. Yamashita, Fishery Research 

 Biologist 



Howard O. Yoshida, Fishery Research 

 Biologist 



Richard J. Hansen, Fishery Aid 



