The dif'fsrent gsar used to catch tuna may yield quite different 

 size groups of tuna and it seems desirable to classify the morphometric data 

 accordinglyo The abbreviations used in the tables are as followss 



Gill net Gn 



Long line LI 



Pole and line PI 



r'urse seine Ps 



Troll Tr 



The characters usually presented in the tables are those which 

 Schaefer concluded were most useful for differentiating the stocks of tuna. 

 Earlier papers by Schaefer (1948) and Schaefer and i/Valford (l950) included 

 some characters that were difficult to measure accurately and consistently 

 by different examin3rs under adverse field conditions and others that we 

 do not consider useful for comparative purpose 3 » With the elimination of 

 some characters, there is the addition of a new measurements, the distance 

 from the insertion of ventrals to the anterior edge of the vent„ 



The Department of Defense has approved for publication the data 

 collected in Bikini, ">Testern J.Iarshalls by I.!r, Jo Co 'larr. In addition to 

 the characters used in this publication, he measured other characters s 

 pectoral insertion to insertion 1st dorsal, length base 1st dorsal, length 

 longest dorsal finlet, length longest dorsal spine, spread caudal, greatest 

 width caudal peduncle at keels, least depth caudal peduncle, length maxillary, 

 number of gill rakers and number of finlets. These data will be included in 

 publications by HIto !,':arr. 



