FISHERY BULLETIN: VOL. 85, NO. 4 



REGION 

 ATKA-B|ATKA-G| KOD i YAK i SE i VAN ATKA-B |ATKA-G| KOD , YAK , SE , VAN 



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Figure 2.— Continued. 



and western extremes of the sampling range 

 and shortest in the Yakutat region. In all re- 

 gions but Yakutat, sexual dimorphism was 

 high and significant, and fins in females aver- 

 aged >1 mm shorter than in males. 

 Upper -jaw length (Fig. 2M). — Geographic varia- 

 tion was significant, and jaws averaged longest 

 in eastern Aleutian samples (Atka-Bering and 

 Atka-Gulf regions). Sexual dimorphism was 

 significant in three regions (Atka-Bering, 

 Atka-Gulf, and Southeastern), with females av- 

 eraging shorter upper jaws than males in each. 



Upper -jaw width (Fig. 2N). — Geographic varia- 

 tion was significant, with upper jaws averaging 

 narrowest in the Kodiak region. Sexual dimor- 

 phism was important in only the Atka-Bering 

 and Southeastern regions, where females aver- 

 aged narrower upper jaws than males. 



Symphyseal knob (Fig. 20). — Geographic varia- 

 tion was significant but erratic. On average, 

 specimens from the Atka-Gulf region probably 

 have the largest symphyseal knobs. Sexual di- 

 morphism seems unimportant. 



6th spinous ray in dorsal fin (Fig. 2P). — Geo- 



672 



