CONTENTS- -Cont. 



Page 



39 



Tuna ec olog y 3 ^ 



Baja California 37 



Middle America 



Gulf of Tehuantepec 4j 



Oceanic islands 4j 



Summary and evaluation 4^ 



Recomnnendations for future work 44 



Publications and manuscripts 45 



Literature cited 45 



FIGURES 



1. Principal activities of the STOR program 4 



2. Track chart, cruise TO-6O-1 6 



3. Moored stations, types A, B, and C, diagrammatic, not to scale 9 



4. Temperature record from a moored station, 80 feet belo\v surface at La Jolla 12 



5. Distribution of surface temperature, yellowfin, and skipjack in Middle American waters 



in the fourth quarter (October-December) 15 



6. Offshore Ekman transport of water, Mjj. computed for each season from mean wind 



stress values and average coastline orientations for 5-degree rectangles along the 

 eastern sides of oceans 18 



7. (Above) Tennperature profiles along east-west and north-south sections in the Gulf of 



Tehuantepec in November 1958, before a northerly gale, (Below) Profiles along the 

 same sections after a gale 19 



8. Current, temperature, and zooplankton charts for the Gulf of Tehuantepec on SCOT 



Expedition 20 



9. Temperature profile along east-west section. Cape Corrientes to Cocos Island, SCOT 



Expedition in May 1958 22 



10. (Above) Net for collecting micronekton at 5 knots. (Below) Net for collecting micro- 



nekton at 10 knots 32 



11. Surface chlorophyll a and productivity, plotted for noon stations of six cruises 34 



12. Distribution of total micronekton on SCOT Expedition 36 



13. Chlorophyll a and zooplankton at noon stations , and zooplankton and micronekton at night 



stations: TO-58-1 (SCOT) and TO-59-1 37 



14. (Above) Mean zooplankton volume, Baja California coast between lat. 25° and 29° N., 



by month and year. (Below) Northern limits of yellowfin, skipjack, and 21° C. water, 



by month and year 38 



