Figure 10. — The occurrence of the two types of sailfish larvae (typical pigmented larvae and 

 larvae without pigments) in the Indian and Pacific Oceans. 



belong to a separate subpopulation from the pig- 

 mented larvae. To prove this point will require de- 

 tailed studies on the ecology of the larvae as well as 

 of the adults. If this hypothesis is correct, then 

 studies of larval morphology will contribute not only 

 to species identification, but also serve as a new 

 approach towards population identification. 



ACKNOWLEDGMENTS 



I wish to sincerely thank Tamio Otsu of the Na- 

 tional Marine Fisheries Service, Honolulu, who 

 helped me with the English translation of the manu- 

 script. Thanks are also due to Walter M. Matsumoto 



who read the manuscript. I am grateful to Teiko Doi 

 who assisted in finding the diagnostic characters of 

 the larvae and prepared the illustrations. 



LITERATURE CITED 



UEYANAGI, S. 



1959. Larvae of the striped marlin. Makaira milsukurii 



(Jordan et Snyder). (In Japanese. English summ.) Rep. 



Nankai Reg. Fish. Res. Lab. 11:130-146, 2 plates. 

 1963. Methods for identification and discrimination of the 



larvae of five istiophorid species distributing in the Indo- 



Pacific. (In Japanese, English sumni.) Rep. Nankai Reg. 



Fish. Res. Lab. 17:137-150, 4 plates. 



78 



