50 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Table 5. — Average lengths of biuefin tuna, in each age group as indicated in figures 4 to 11, listed by ages, years of 



measurement, and year classes 



Table 6. — Estimated sizes of young biuefin tuna at the middle of each month derived from figure 16 



Month 



May 



June 



July 



August 



September, 



October 



November, 

 December. 

 January... 

 February.. 



March 



April 



Fork length in inches curved 

 measurement 



Age in years 



IV 



43.5 

 43.7 

 44.5 

 46.7 

 46.9 

 48.0 



Fork length in centimeters straight 

 measurement 



Age in years 







15.8 

 25. 1 

 30.6 

 34.8 

 37.2 

 40.6 

 42.9 

 44.8 

 46.5 

 48.0 

 49.1 



61.1 

 52.8 

 55.3 

 58.2 

 60.9 

 63.5 

 66.2 

 67.7 

 68.6 

 68.9 

 69.1 

 69.4 



71.8 

 74.5 

 77.6 

 80.9 

 84.0 

 85.9 

 86.2 

 86.4 

 86.6 

 86.9 

 87.1 



III 



87.1 

 88.1 

 90.9 

 94.0 

 97.4 

 100.8 

 103.9 

 104.8 

 105.0 

 105.1 

 105.3 

 105.7 



IV 



106.0 

 106.7 

 108.5 

 111 3 

 114.1 

 117.0 



Weight in pounds 



Age In years 







0.2 



0.6 



1.1 



1.9 



2.1 



2.9 



3.5 



4.1 



4.6 



6.0 



5.4 



6.2 

 6.8 

 7.8 

 9.4 

 10.0 

 11.5 

 13.6 

 14.2 

 14.6 

 14.9 

 15.1 

 15.3 



15.5 

 17.0 

 19.0 

 22.0 

 24.4 

 26.5 

 29.0 

 30.0 

 30.4 

 30.6 

 30.8 

 31.0 



III 



31.2 

 32,0 

 34.0 

 36.6 

 42.0 

 46.0 

 49.0 

 49.6 

 50.0 

 50.2 

 50.4 

 50.7 



IV 



51.0 

 52.0 

 55.0 

 60.5 

 65.0 

 68.0 



