588 



Fishery Bulletin 94(3). 1996 



be used to estimate selectivity, and then selectivity could 

 be fixed in catch-length analyses. 



The trend of legal male abundances for Kodiak 

 RKC is similar to that for Bristol Bay RKC, except 

 that the Kodiak stock peaked 13 years prior to Bristol 

 Bay. The high estimated abundance for the Kodiak 

 population in the early 1960s may partly reflect ex- 

 pansion of the fleet to new fishing grounds (Spalinger 5 ), 

 whereas the peak abundance for the Bristol Bay 

 population in the late 1970's resulted from strong 

 recruitment (Zheng et al., 1995). Both populations 

 decreased dramatically from their peak abundances 

 within a few years and then fluctuated at low levels 

 over time. When these two populations are exam- 

 ined over the same time scale, the trends are quite 

 different. The abundance for the Bristol Bay popula- 

 tion increased greatly from the early to late 1970's, 

 whereas the abundance for the Kodiak population 

 gradually decreased during the same period. The 

 abundances for both populations decreased from 1980 

 to 1982. Since 1982 the Bristol Bay population has 

 recovered a little, whereas the Kodiak population has 

 completely collapsed and has not been able to sup- 

 port a fishery (Spalinger 5 ). 



Acknowledgments 



This paper is funded in part by cooperative agree- 

 ment NA37FL0333 from the National Oceanic and 

 Atmospheric Administration. We thank Fritz Funk 

 and two anonymous reviewers for reviewing the 

 manuscript. 



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