FISHERY BULLETIN: VOL. 72, NO. 2 



Figure 6. — Relationship of the axial skeleton to the fin supports and fins in Thunnus spp., 31 mm SL. 



VERTEBRA 



HAEMAL PREZYGAPOPHYSIS 



r. alalunga 



MAL POSTZYGAPOPHYSIS 

 HAEMAL SPINE 



r. atlanticus 



L thynnus 



T. spp. 



Figure 7. — Shape of the first haemal spine for juveniles of the Thunnus species. From left to right: T. alalunga 17, 

 34, 61, 91 mm SL; T. atlanticus 18, 34, 64, 85 mm SL; T. thynnus 17, 33, 65, 100 mm SL; Thunnus spp. 16, 33, 47 mm SL. 



570 



