728 



Fishery Bulletin 91(4), 1993 



0.2 0.3 4 5 6 7 1 



Cushlng recruitment exponent q 



Figure 5 



Loci of -10% bias in F' usr obtained when the base model is used to 

 approximate the modification in which the maximum age in the 

 population is finite. Points above and to the left of the curves corre- 

 spond to a bias of less than 10% (absolute value I, while points below 

 and to the right of the curves correspond to a bias of greater than 

 10% (absolute value). 



helpful. Several anonymous reviewers also supplied 

 constructive suggestions. 



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Table 2 



Degree of polynomial solutions for F' Msy under various 

 modifications. 



Modification 



Degree 



Beverton-Holt stock-recruitment 



Generalized von Bertalanffy growth 

 A'=0 

 K>0 



rc+1 



2n+l 



Divergent ages of recruitment and maturity 

 <V>a„, 3 



"i«i,„ 4 



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