18 



Fishery Bulletin 92(1), 1994 



stable population sizes are maintained. Earlier stud- 

 ies of A. sirm and H. quadrimaculatus in Tarawa 

 lagoon suggested that these species spend at least 

 part of their life outside the lagoon (R. Cross, 1978 4 ; 

 McCarthy, 1985 1 ). If this is the case, fluctuations in 

 the relative abundances of these species may be re- 

 lated to migrations; a better understanding of the fac- 

 tors causing large-scale movements is necessary 

 before predicting the potential yield of this fishery. 



Acknowledgments 



We thank staff of the Kiribati Fisheries Division for 

 assistance with fieldwork during the project. Peter 

 Crocos and Jock Young and three anonymous re- 

 viewers made constructive comments on earlier 

 drafts. This work formed part of the baitfish re- 

 search project PN 9003 funded by the Australian 

 Centre for International Agricultural Research. 



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