222 



Fishery Bulletin 88(1 



1990 



some postspawning mortality (Humphreys et al. 1984, 

 Humphreys and Tagami 1986). Conversely, the exis- 

 tence of larger and older specimens in the north- 

 western Hawaiian Islands would suggest that longer 

 life is possible and different life histories occur in dif- 

 ferent environments. Of the sagittae from large pelagic 

 armorhead examined for comparison purposes, fish 

 43-48 cm FL {N = 3) had four check marks, fish 48-54 

 cm FL (A^ = 2) had five check marks, and the largest 

 fish, 54.7 cm FL, had eight-plus check marks (Fig. 1). 

 Although the relationship of these large pelagic ar- 

 morhead to those on the seamounts is unknown, it is 

 plausible that during the pelagic stage juveniles were 

 displaced to the east, entered the subtropical gyre, and 

 grew larger while spending 1-3 years longer in the 

 open ocean before settling in the northern Hawaiian 

 Ridge seamounts, southeast of the SE-NHR sea- 

 mounts (Boehlert and Sasaki 1988). 



Acknowledgments 



We thank G. Kobayashi of the Oshoru Maru for col- 

 lecting the oceanic pelagic armorhead specimens. 

 B. Mundy verified the postlarval specimens. We also 

 thank G.W. Boehlert, G.M. Cailliet, R.D. Methot, D.A. 

 Somerton, and especially the anonymous reviewers for 

 critically reviewing this manuscript. 



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