in Table 2 fifth or sixth year 1 fish 



seventh yearo 9 fish 



eighth year. 1 fish 



total 11 fish 



in Table 3 fourth or fifth year 1 fish 



seventh year 13 f isth 



total U fish 



Combining all of these data «a find that of a total of 36 fish 



seventh year.,., 23 fish 



sixth or seventh year 3 fish 



eighth year, c, 2 fish 



fourth or fifth year 1 fish 



fifth or sixth year 1 fish 



seventh or eighth year. ....... 1 fish 



From a consideration of these data we can conclude that among the yellowfin 

 tuna taken on long lines in Palau waters recently fish in their seventh year 

 predominate with some admixture of both older and younger year classes. 



It is the author's intention to obtain as much accurate data as possibl** 

 hereafter and to use these data to investigate the ages of skipjack and albacore 

 ac well as yellowfin tuna not only in Palau waters but everywhere in the archi- 

 pelago. (December 1) 



Measurements and Ages of Tuna from Palau Waters 



by 

 Kenzo Ikebe, Technician 



[from South Sea Fishery News fNanyo Suisan Joho], Vol.4, No.l, February 5, 19il0] 



In the preceding number of this journal the author published a paper on the 

 ages of yellowfin tuna ftrom Palau waters. In presenting a second paper on this 

 subject there is some danger of repetition, but since it is thought that in at- 

 tempting to determine the age of firti by measuring their length and woight the 

 more data the study is based on the more accurate and reliable will be the re- 

 sults, the author has decided to attempt to write something more on the subject. 



Last December on the second cruise of the Nanko Fishing Company's Awa Maru 

 (92 tons, 185 horsepower) after her arrival ftrom Japan she operated on the fish- 

 ing grounds within a radius of 100 miles to the southeast of Palau. On December 

 23 a big catch was made at a point ^iO miles southeast by south of the Palau 

 lighthouse. Length and weight were determined on 10 spearfish f niakaira m^tsukurilil. 

 35 ble-eyed tuna f Parathunnus mabachi ] , and 51 yellowfin tuna fNeothunnus macrop- 

 tfiUlgJfrom this catch. These data are given below. 



These measurements were taken lAen the catch was being weighed while the 

 fiah were being transferred ftrom the Awa Maru to the ftreighter Ebon Maru. In 



20 



