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Fishery Bulletin 103(2) 



In sensitivity analyses, the spawning season ranged 

 from one to six months and was assumed to occur at 

 the end of the year. 



A selection differential cannot exist without phe- 

 notypic variation. The base model assumed a coeffi- 

 cient of variation (CV) of 20% in both L^ and K. For 

 sensitivity analyses, combinations of 09c , 10%, and 

 20% CV in L x and K were examined for the influ- 

 ence of growth variability on selection differentials 

 of L and K. 



Results 



Changes in growth parameters L, and K affect size-at- 

 age jointly, resulting in non-uniform selection differ- 

 entials across ages (Fig. 3). The selection differentials 

 on size are bounded by the differentials at the extreme 

 ages, t and ». At the youngest age, the selection dif- 

 ferential on size is limited by the sum of the selection 

 differentials on L r and K plus their product. (At age t , 

 the selection differential on size is undefined.) As age 



