ILLUSTRATIONS 



FIGURE Page 

 Frontiapiece: Tracks of POFI albacore cruises in the North Pacific, May to November 1955 



1. Spring cruises of the Manning cruise 25 and the Smith cruise 29. 2 



2. Sumnner cruises of the Manning cruise 26 and the Smith cruise 30 3 



3. Fall cruise of the Gilbert cruise 23 4 



4. Length frequencies of surface- ajid subsurface-caught albacore 6 



5. Surface bucket temperatures, tennperature-depth section and sounding tube depths along 



35*N. latitude; Manning cruise 26 31 



6. Surface bucket temperatures, temperature-depth section and sounding tube depths between 



longitudes 130"W, and 140*W.; Manning cruise 26 31 



7. Surface bucket temperatures, tennperature-depth section and sounding tube depths between 



longitudes 127'W. and 130*W. ; Manning cruise 26 31 



8. Surface bucket temperatures, tennperature-depth section and sounding tube depths along 



165*W. longitude; Gilbert cruise 23. The tennperature-depth section was taken running 

 north of 166*W. longitude and the sounding tube depths retracing southward. All of the 

 bathythernnograph slides of thie latter run and some of those covering the northernmost 

 region of the former were lost so that only the uncorrected data from the northward 

 track rennain 32 



9. Surface bucket tennperatures, temperature-depth section and sounding tube depths along 



175*W. longitude; Manning cruise 25 33 



10. Surface bucket tennperatures, temperature-depth section and sounding tube depths along 



165*W. longitude; Manning cruise 25 33 



11. Surface bucket temperatures, tennperature-depth section and sounding tube depths along 



160*W. longitude; Manning cruise 25 33 



12. Surface bucket tennperatures, temperature -depth section and sounding tube depths along 



155*W. longitude; Smith cruise 29 34 



13. Surface bucket temperatures, temperature-depth section and sounding tube depths along 



147'W, longitude; Smith cruise 29 34 



14. Surface bucket temperatures, temperature-depth section and sounding tube depths along 



139*W. longitude; Smith cruise 29 35 



15. Surface bucket tennperatures, tennperature-depth section and sounding tube depths between 



longitudes 140°W. and 152*W. ; Manning cruise 26 36 



16. Surface bucket temperatures, temperature-depth section and sounding tube depths between 



longitudes 132*W. and 143*W. ; Manning cruise 26 36 



17. Surface bucket temperatures, temperature-depth section between longitudes 164°W. and 



158*W, ; Gilbert cruise 23 37 



18. Surface bucket tennperatures, temperature-depth section between longitudes MS'W. and 



143'W. ; Gilbert cruise 23 37 



