HANAN: BLUEFIN TUNA FISHERY 



Table 6.— Bluefin tuna CPUE values from this study (CFG) 

 for the years 1954-74 and from IATTC (Bayliff and Calkins 

 1979) for the years 1954-78. CFG values converted to IATTC 

 equivalent values are in parentheses. 



CPUE values 



CPUE values 



LENGTH-FREQUENCY ANALYSIS 



Length-frequency data summaries (Figs. 11- 

 14) were obtained from two CFG data sets of 

 fork-length samples taken as frozen bluefin were 

 unloaded at Terminal Island, Calif., canneries. 

 Set 1 (1952-65) represents random samples of 50 

 fish/seiner; set 2 (1963-71 and 1974) represents 

 random samples of 20 fish for every 200 short 

 tons landed from each 1° area of latitude and lon- 

 gitude. Set 2 samples were taken for an age de- 

 termination study. Although a smaller number 

 of bluefin were sampled, they appear to repre- 

 sent the same population as the first data set, 



z 



O 4 



a 



LU 



a 

 2 



1952 

 N=1,140 



60 80 100 120 140 160 180 



120 



140 



160 



180 



60 80 100 120 140 160 1 



180 



O 4 



1954 

 N = 3,680 



ML 



T — i 1 



60 80 100 120 140 160 180 



60 80 100 120 140 160 1! 



FORK LENGTH (cm) FORK LENGTH (cm) 



Figure 11.— Bluefin tuna percent length frequencies, 1952-57. 



113 



