34 
Fishery Bulletin 11 7(1-2) 
O. kenojei : East China Sea (EC), Yellow Sea (YS), Sea 
of Japan (SJ), east coast of Kyushu Is. (EK), Osaka 
Bay (OS), and Pacific coast of northern Japan (NP). 
In particular, careful monitoring of population (stock) 
abundance of local populations characterized by low 
genetic diversity and geographical isolation, such as 
the abundance of OS and NP populations of O. kenojei, 
is necessary. Tagging studies, which may reveal some 
aspects of migratory behavior, may also help to clarify 
factors contributing to the population structure of O. 
kenojei. 
Acknowledgments 
We are very grateful to N. Nakatsuka, S. Ikeguchi, T. 
Kintaka, T. Mochizuki, T. Imaizumi, T. Mukai, R. Ko- 
moto, Y. Uchida, S. Suzuki, D. Noguchi, J.-K. Kim, and 
K. Sakai for collecting samples. We sincerely thank the 
captains, officers and crews of the RV Wakataka-maru 
and RV Taka-tnaru (Fisheries Research and Education 
Agency), and RV Shimane-maru (Shimane Prefectural 
Fisheries Technology Center) for assistance in the field. 
We also thank G. S. Hardy (Ngunguru, New Zealand) 
for his critical reading of the manuscript. 
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