1600 



1400- 



1200 



10 



E 



2 1000 



I 



- 800 



600 



400- 



200- 



POLLOCK MALES 



/ 





B > 





/ 





D V 







4 



w=oo 



051 L 30641 



•7 





s 7 



" 



7Z l* " 







• .-j? 





— 1 l-"l 1 1 1 1 1 



— 1 1 l 1 l l 



POLLOCK FEMALES 



1600 



10 20 30 40 50 60 

 FORK LENGTH (cm) 



30 40 



FORK LENGTH (cm) 



Figure 31. — Length-weight observations from walleye pollock taken during the 1976 Bering Sea spring trawl survey, by sex and otolith area (see Fig. 4). 



Table 25. — Parameters of the von Bertalanffy growth curves for walleye pollock by sex and otolith area, 1976 



Bering Sea spring trawl survey. 









Number 



Age 



FL 



Standard 











Otolith 





of age 

 readings 



range 

 &r) 



range 

 (cm) 





Parameters 





Sex 



areas' 



Data set 



curve fit 



ico 



A" 



h 



Male 



A B 



All ages 



525 



1-14 



12-67 



3.25 



62.61 



0.23 



0.01 







Selected ages 





0,2-11 



17-67 



1.46 



55.77 



0.27 



-0.01 





D 



All ages 



321 



1-12 



9-63 



1.15 



54.34 



0.26 



0.11 







Selected ages 





0, 2-10 



15-58 



1.67 



55.34 



0.23 



-0.01 





ABD 



All ages 



846 



1-14 



9-67 



3.49 



61.93 



0.23 



0.22 







Selected ages 





0.2-11 



15-67 



1.87 



56.58 



0.24 



-0.02 



Female 



A B 



All ages 



810 



1-15 



12-72 



3.94 



75.74 



0.15 



-0.32 







Selected ages 





0, 2-12 



18-72 



0.79 



60.29 



0.24 



0.00 





D 



All ages 



334 



2-13 



18-74 



4.57 



65.44 



0.21 



0.42 







Selected ages 





0, 3-11 



25-74 



2.25 



58.62 



0.23 



0.02 





ABD 



All ages 



1,144 



1-15 



12-74 



3.89 



77.55 



0.14 



-0.29 







Selected ages 





0. 2-12 



18-74 



1.07 



60.95 



0.22 



0.00 



'See Figure 4. 



46 



