FIGURES 



1. Approximate location of the North American, longline, and pole-and- 

 line albacore fisherips 



Page 



2. Albacore landings taken by various fisheries in the Pacific Ocean, 

 1950-59 (from Yoshida and Otsu. 1963: p. 317) 



3. Catch-per-hundred-hooks (in number of fish) computed as an average- 

 of-ratios statistic and a ratio-of-averages statistic for each month in 

 Marsden square 130 (lat. 30°-40° N., long. 140°-150° E.), 1949-61 



Estimated average apparent abundance of albacore (in numbers of fish 

 caught per hundred hooks) in 1949 and in 1961 for Marsden squares 

 90-95 and 126-130. Circles denote slopes that were significant at the 



5-percent level_ ___^_ 



Average length of albacore taken in various North Pacific albacore 

 fisheries. Data on the longline and pole-and-line fisheries were com- 

 piled from Clemens and Craig (1965) and Suda (1963a) 



6. Average deviations of CPUE for albacore from the regression of 

 CPUE on year for each month from November 1947 to December 1961 7 



7. Relation between spatial statistics (January 1957) and normal prob- 

 ability distribution for effort and CPUE (in numbers of fish per hun- 

 dred hooks) 9 



8. Spatial statistics for effort 1949-61 on the North Pacific albacore 

 longline grounds. The heavy line represents the peak fishing period 



from December to March 10 



9. Spatial statistics for catch 1949-61 on the North Pacific albacore 

 longline grounds. The heavy line represents the peak fishing period 



from December to March^ 12 



10. Spatial statistics for CPUE 1949-61 on the North Pacific albacore 

 longline grounds. The heavy line represents the peak fishing period 



from December to March 14 



11. Trends in February effort spatial statistics 17 



12. Trends in February catch spatial statistics 18 



13. Trends in February CPUE spatial statistics 18 



14. Latitudinal and longitudinal moments of CPUE for each month and 

 year. The center of the cross represents the average position of the 

 latitudinal and longitudinal moments for each month 19 



15. Latitudinal and longitudinal moments of effort for each month and 

 year. The center of the cross represents the average position of the 

 latitudinal and longitudinal moments for each month 20 



16. Distance from site of tagging as a function of time at liberty. Note 

 that the shorter term recoveries are plotted on an expanded scale. 

 Data are from Otsu and Uchida (1963). (15 miles = 27.8 km., 



10 miles = 18.5 km., 5 miles = 9.3 km.) 23 



17. Model of albacore migrations in the North Pacific Ocean, by age 

 groups (ages encircled) taken from figure 9 of Otsu and Uchida (1963) 24 



18. Expected lengths of albacore taking two different migration routes 26 



19. Predominant movement of albacore in the North Pacific Ocean. 

 Dashed lines passing through any block indicate relatively low vul- 

 nerability in the block, and solid lines through a block indicate high 

 vulnerability. The position of the arrows should not necessarily be 

 taken as the geographic location of the migration route 27 



