FISHERY BULLETIN: VOL. 81. NO. 4 



Table 1. — Input parameter values for southern bluefin tuna necessary for the evaluation of CB using method I. 



Parameter 



Symbol 



Value 



Source of Information 



Youngest exploited age class 

 Oldest exploited age class 



Proportion of fish belonging to 

 age class which is sexually 

 mature 



Abundance of fish about to 



enter age class r 



Yearly average rate of natural 



mortality 



Existing parental biomass (kg) 



Fraction of the total 1 980 catch 

 (in number) belonging to age- 

 class / (1980 calendar year) 



No, 



PS 

 f. 



2-8 

 9-20 



Weight (kg) at the beginning of 

 the year for a fish belonging to 

 age class i 



Ws, 



Weignt (kg) at the middle of the 

 year for a fish belonging to age 

 class / 



W, 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



9 

 10 

 1 1 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 18 

 20 



2 



3 



4 



5 



6 



7 



8 



9 



10 



1 1 



12 



13 



14 



15 



16 



17 



18 



19 



20 



2 

 20 







1 



5,258.422 



0.2 



167.371.601 



0.085321 

 411359 

 0.221376 

 0.053785 

 0.041523 

 0.022783 

 0.027565 

 0.031522 

 0.043063 

 0.034070 

 0.015556 

 0.007112 

 0.003083 

 0.001021 

 0.OOO5O5 

 0.000175 

 0.000096 

 0.000046 

 0.000037 



47.11 

 55.07 

 62.53 

 69.42 

 75.68 

 81.31 

 86.34 

 90.80 

 94.72 

 98.17 

 101.17 

 103.79 



1.81 

 5.55 

 11.19 

 18.26 

 26.22 

 34 58 

 42.99 

 51 14 

 58.87 

 66.05 

 72.62 

 78.57 

 83.90 

 8864 

 92.82 

 96.50 

 99.72 

 102 53 

 10497 



Majkowski et al. (1981b) 

 Shingu(1978) 



Shingu(1978) 



J. Hampton (unpubl. data) 



Hayashi et al. (1972) 



J. Hampton (unpubl. data) 

 J. Hampton (unpubl. data) 



Robins (1963) 

 Kirkwood(1983) 



Robins (1963) 

 Kirkwood(1983) 



728 



