FISHERY BULLETIN: VOL. 80, NO. 2 



0.5mm 



Figure 13.— Anteriormost three vertebrae and pterygiophores with fin rays from a 35.9 mm 

 ESL Xiphias gladius. C, centrum; D, distal radial; F, neural foramen; HPo, haemal post- 

 zygapophysis; NPo, neural postzygapophysis; NPr, neural prezygapophysis; Ns, neural spine; P, 

 proximal radial; Pa, parapophysis; R, ray. 



0.5mm 



0.1mm 



0-5 mm 



1 mm 



Figure 14.— Anterior view of the 12th dorsal ray and its distal 

 radial from Xiph ias gladias, showing the ontogeny. Starting 

 from left the specimens' lengths in millimeters ESL are: top, 

 64.6, 187; bottom, 225, 668. D, distal radial; R, fin ray. Car- 

 tilage, white; ossifying, stippled. 



0.25 mm 



Figure 15. — Anterior view of two fin rays and their distal 

 radials from juvenile Xiphias gladius. The specimens' 

 lengths in millimeters ESL are: left, 225, first anteriormost 

 dorsal ray; right, 668, next to last posteriormost dorsal 

 ray. D, distal radial; R, fin ray. Cartilage, white; bone, 

 stippled. 



added in an anterior and posterior direction 

 (Fig. 6). Adult anaUounts of 16-19 rays (10.6-668 

 mm ESL, TV = 66, X = 17.1, SD = 0.81) were first 

 observed at 7.8 mm ESL and all specimens 

 longer than 10.6 mm ESL had the adult counts 

 (Fig. 6; Table 8). Our counts generally agree with 

 those of Arata (1954), except we had two speci- 

 mens with 19 anal rays; Arata had none. 



Table 8.— Development of anal fin rays for 213 Xiphias gladius (3.7 mm ENL-225, 

 668 mm ESL). X = mean, SD = standard deviation. 



170 



