368 



Fishery Bulletin 98(2) 



A 



B 



^ 



D 



Figure 2 



Ventral profiles of excised intact yellowfin tuna swimbladders scaled to relative size. Values 

 given for each image are measured lengths and displacement volumes of bladders, fish 

 length, and fish weight. (A) 115 mm and 43 cc, .590 mm, 4.1 kg. (Bi 1.35 mm and 81 cc, 751 

 mm, 8.2 kg. (C) 184 mm and 280 cc, 940 mm, 16.8 kg. (Di 205 mm and 495 cc, 1129 mm, 

 27.2 kg. (E) 270 mm and 915 cc, 1346 mm, 44.5 kg. 



mate F-ratio statistic (Zar, 1974) indicated that the 

 sample power functions fitted to the data of percent- 

 age of swimbladder vokime (obtained from geomet- 

 ric reconstruction) to fish length (57 to 157 cm, n=46 ) 

 from our study and (35 to 149 cm, n=62) from Schae- 

 fer's study (1999) are estimating the same popula- 

 tion regression function (F=2.65„ P>0.10). It thus 



appears appropriate to pool the two sets of data for 

 yellowfin tuna swimbladder volumes obtained from 

 geometric reconstruction, in order to provide the 

 most comprehensive model possible. 



The relation of swimbladder volume (estimated by 

 geometric reconstruction I and length of the yellowfin 

 tuna from our study, combined with that from Schae- 



