Fitzgerald et al.: Elemental signatures in otoliths of larval Theragra chalcogramma 



615 



vestigating the potential existence of fine-scale popula- 

 tion structure throughout the species range. Significant 

 fine-scale population structure has been linked to the 

 failure of northern cod stocks to recover from exploita- 

 tion, even in the face of fishing moratoriums (Frank 

 and Brickman, 2000; Hutchings, 2000). Analogous de- 

 mographic processes acting in northern cod populations 

 are clearly possible in walleye pollock, given the phyolo- 

 genetic and life history similarities between the two 

 species. The structure of pollock stock complexes within 

 the major basins of the North Pacific Ocean remains, 

 therefore, a critical gap in the knowledge necessary for 

 the sustainable management of one of the world's larg- 

 est marine fisheries. 



Acknowledgments 



This work was funded by North Pacific Marine Research 

 Program to KMB, SRT and KPS, and was supported in 

 part by NSF grants OCE-9871047 and OCE-0134998 to 

 SRT. We thank the MACE, FOCI and groundfish task 

 scientists who collected samples, and C. Latkoczy for 

 assistance with the laser ablation ICP-MS analyses. This 

 is Fisheries-Oceanography Coordinated Investigations 

 collection number 0471-00A-0. 



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