triggerfish (Balistes) and filefish ( Monacanthus ) in the 1934. collections. 



Appearances of crustaceans increased greatly in 193A» but it is wondered 

 whether this increase, as well as that of the filefish mentioned above, may not 

 have been due to the difference in the fishing stations rather than to seasonal 

 variation. 



Carangids did not appear in the 193A collections at all. 



No important change could be detected in the number of appearances of needle- 

 fish, barracuda, and so forth. 



Aa for the larger fish, that is, the scombroid fishes, in 1933 they appeared 

 only once and that mas only one specimen, but in 1934. they appeared 8 times and the 

 number of specimens reached a total of 13. 



Well, these facts have been recorded as seasonal variations, but the occurrence 

 of such violent changes in tropical, or rather in equatorial waters, cannot but be 

 regarded as a little strange, however, it is thought that the fluctuations in the 

 numbers of squid, anchovies, herring, scombroids, and so forth may probably be more 

 properly ascribed to seasonal changes than to differences between the fishing 

 grounds. 



If after all these phenomena are due to seasonal rather than geographical 

 differences, we can reach the interesting conclusion that it is possible, through a 

 study of the food of the yellowfin tuna, to gain some knowledge concerning the mi- 

 grations and population fluctuations of a part of the fauna of the Celebes Sea. 

 Thus these data can serve not only for the investigation of the food and habits of 

 the tuna, but also for the study of other problems, 



(10-12-35) 



Viorks Consulted 



Kishinouye, K. - 1923, Contribution to the Study of the So-called Scombroid Fishes. 

 Jour. Coll, Agri. Imp. Univ. Tokyo, 



Suehiro, Yasuo - 1934. On the Digestive System and Food of Monacanthids, Zoological 

 Magazine, Vol, 4.6, No,539» 



193^. On the Digestive Systems and Foods of the Principal Fishes of 



the North Pacific, Report No,l, Cod and Etsu [ Coilia mystus ] . Nippon 

 Suisain Gakkai Ho, Vol.3, No.lo 



" 1935o On the Digestive System of the Flyingfish. Nippon Suisan 



Gakkai Ho, Vol„4, No.lo 



