Figure 25. Hawaiian skipjack landings 1949-1952. 

 The data shown on these graphs are the catches of the live-bait 

 tuna fleet of Hawaii and were furnished by the Territory of 

 Hawaii, Board of Commissioners of Agriculture and Forestry, 

 Division of Fish and Game. The figures for the last 2 months 

 of 1952 are prelinninary totals subject to revision. 



Figure 26. Survey plan for Ha^vaiian hydrogragh^. 

 Our plans for future work are based in part on a considerable 

 amount of hydrographic observations and plankton tows already 

 made in Hawaiian waters and summarized in table 7. 



These observations were taken as follows: 



1. The station pattern WdS planned to cover waters 

 immediately around the islands and extending offshore 50-100 

 miles in order to include the transition frona conditions associ- 

 ated with the presence of islands to conditions that are practically 

 oceanic. 



2. At each station serial oceanographic observations 

 were taken to 1, 200 meters except where the water was too shoal. 



3. The properties measured were temperature and 

 salinity on all cruises and included dissolved oxygen on cruises 1 

 and 10 and inorganic phosphate on cruises 10, 12, 17, and 20. 



4. Zooplankton hauls were of approximately 1/2 -hour 

 duration and were taken with a meter net of 30xxx grit gauze in 

 the manner indicated. Cruise 1, being the shakedown cruise, also 

 tested nets of 56xxx and 18xxx mesh« 



5. Two bathythermograph casts were made at each 

 station and at 10-mile intervals between stations. They were to 

 900 feet on all cruises with the exception of the first six casts on 

 cruise 1, which were to 450 feet, 



6. Surface current measurements on station and mid = 

 way between stations were taken with the geonnagnetic electroki- 

 netograph (GEK) on cruises 12 and 20. 



48 



