514 



Fishery Bulletin 102(3) 



Walleye pollock 

 All structures 



MNI 



8 



6 1 



n = 666 



No DCFs 



DCFs 



applied 



— i — i — i — i — i — i — i — 



10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 

 Estimated fork length (cm) 



B Atka mackerel 



All structures 



1NI 



No DCFs 



DCFs 

 applied 



10 20 30 40 50 60 70 80 



i — i — r 



10 20 30 40 50 60 70 80 



Estimated fork length (cm) 



Figure 2 



Relative frequency histograms of the estimated fork length of <A> walleye pol- 

 lock and iB) Atka mackerel consumed by Steller sea lions. Fork lengths were 

 predicted from cranial structures in good and fair condition. Comparisons 

 were made on the application of correction factors (DCFs) which account for 

 digestion and for using minimum number I MNI I estimates as a selection tech- 

 nique versus using all structures. Otoliths (black bars) are stacked beneath 

 all other structures (gray bars). 



was found in the proportion of stage classes between 

 summer rookery (9.09% juvenile; 20.45% adolescent: 

 53.03$ subadult; 65.15'^ adult) and winter haul-out 



(2.90% juvenile; 21.74 r ; adolescent; 57.97% subadult; 

 46.38% adult) sites for all years combined (P=0.32, 

 * 2 =2.3, df=2). 



