646 



Fishery Bulletin 103(4) 



with age, but decrease again in later years. These re- 

 sults support previous studies and emphasize the impor- 

 tance of understanding the demographic structure and 

 reproductive biology of a population for the management 

 of fish resources. 



Acknowledgments 



We are grateful to Hiroyuki Munehara for his valuable 

 discussion and comments on the early version of this 

 manuscript and to Yoshio Ishito for his support in col- 

 lecting samples. This work was financially supported 

 by the DEEP Program of the Ministry of Agriculture, 

 Forestry, and Fisheries, Japan. 



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