An analysis of the 1959 data is contained 

 in a report by Brown and Sherman (MS)_L'. A 

 report concerning the results of both the 1959 

 and 1961 cruises is now in preparation (Brown 

 and Sherman (MS))£/. 



FIELD PARTY PERSONNEL 



Charles H. Gilbert - William T. Tanaka, 

 Master 



Cruise 5 1 



Kenneth D. Waldron - Field Party Chief 

 Robert P. Brown - Oceanographer 

 Robert A. Morris - Fishery Research 

 Biologist 



Cruise 52 



Kenneth D. Waldron - Field Party Chief 



(March 27 to May 8) 

 Kenneth Sherman - Fishery Biologist 



(March 27 to May 2) 

 Gary H. Miller - Fishery Aid (May 3-8) 

 Richard S. Shomura - Field Party Chief 



(May 9-17)1/ 

 Eugene L. Nakamura -Fishery Biologist 



(May 12-17) 

 Richard A. Barkley - Oceanographer 



(May 12-13) 

 Herbert J. Mann - Fishery Methods and 



Equipment Specialist (May 12-17) 

 Robert P. Brown - Oceanographer 



(May 17) 

 Thomas Y. Toyama -Physical Science 



Technician (May 17) 



Cruise 53 



Robert P. Brown - Oceanographer, 



Field Party Chief 

 Thomas Y. Toyama -Physical Science 



Technician 

 Gary H. Miller - Fishery Aid 

 Roy Goss - Hawaii Science Club Student 

 David Godfrey - Student (June 20 to 



July 3) 



1/ Brown, R. P., and K. Sherman (MS). 

 Oceanographic observations and skipjack dis- 

 tribution in the north central Pacific. Paper No. 

 V-ll, Pacific Tuna Biology Conference, Honolulu . 

 Bureau of Commercial Fisheries Biological 

 Laboratory, Honolulu. 



2./ Brown, R. P., and K. Sherman (MS). 

 Distribution of surface water types, skipjack, 

 and other biota in the central Pacific during 1959 

 and 1961. Bureau of Commercial Fisheries 

 Biological Laboratory, Honolulu. 



37 From May 9 to 17 field trials of experi- 

 mental gill nets for capturing skipjack were 

 conducted. 



FIELD PROCEDURES 



Bathythermograph and Meteorological 

 Observations 



Bathythermograph (BT) lowerings were 

 made and a surface salinity sample was collected 

 every 3 hours during the three cruises. The 

 observations of weather and sea at each BT 

 lowering appear in tables 1-3. The BT slides, 

 prior to deposition in the U.S. Navy Hydrogra- 

 phic Office, were processed at the laboratory by 

 the method described by Callaway (1957). 



Weather observations were recorded at 

 0000, 0600, 1200, and 1800 GCT daily. These 

 data are presented in tables 4 to 6 (U.S. Weather 

 Bureau Forms 1210-F and 615-5). Recording 

 and coding follow the "Manual of Marine 

 Meteorological Observations" (U.S. Weather 

 Bureau, 1959). 



Zooplankton Collections 



Ninety -nine plankton hauls were made. 

 Of these, 49 were 1/2-hour, 0-60 m. oblique 

 hauls and 50 were 1/2 -hour surface tows. 



All plankton hauls were made using a 

 1-m. net (King and Demond, 1953) with a body 

 of No. 656 Nitex, aperture width 0. 66 mm. , and 

 with a cod end of No. 308 Nitex, aperture width 

 0.31mm. Positions, times of collection, and 

 zooplankton weights are given in tables 7 to 9. 



Surface Fish School, Bird Flock, 

 and Aquatic Mammal Sightings 



A watch was maintained for surface 

 fish schools, birds, and aquatic mammals dur- 

 ing the daylight hours. Summaries of these 

 observations are presented in tables 10 to 12. 



Surface Trolling 



Two lines were trolled during daylight 

 hours. A summary of surface trolling results 

 for the three cruises is presented in table 13. 

 Common and scientific names of fish caught are 

 listed in table 14. 



Tagging 



A total of 241 skipjack were tagged with 

 the all -plastic dart-type tags described by 

 Yamashita and Waldron (1958). A summary of 

 skipjack tagging results is presented in table 15. 



