XI- 



n = 40 



YANC; and LIVINGSTON: FOOD HABITS OF GREENLAND HALIBUT 

 16 



1 2 — n = 64 



8 



4^ 





 12- 



8- 

 4 





 12 



^ 8 



OJ 



3 



Q) 4 — 







12H 



8 



4-1 

 

 12- 

 8- 

 4 

 



IH 



nmH 



rn n .n n 



r^^^ 



n = 1 



_n_ 



n-4 



Predator 

 fork length 



>70cm 



50-69 cm 



30-49 cm 



20-29 cm 



< 20 cm 







50 



100 



150 



200 



250 



300 



350 



400 



450 



Prey pollock fork length (mm) 

 FiGi'RE 4.— Length-frequency distributions of walleye pollock consumed by Greenland halibut in the eastern Bering Sea. 



while macrourids are important prey in even deeper 

 waters (^600 m). 



Trends in Stomach Fullness 



Fewer empty stomachs were found in summer 

 than in spring and autumn except in the ^70 cm size 

 group (Fig. 5). The occurrence of empty stomachs 

 for all size groups was about 35% in summer and 



50% in autumn. In spring, samples from the 30-49 

 cm size group had the greatest percentage of empty 

 stomachs (about 70%), followed by size groups 50-69 

 cm (about 58%) and >70 cm (about 12%). 



There were no apparent diel trends in stomach 

 content weight in this study (Fig. 6). The stomach 

 content weight (expressed as percentage of body 

 weight) for large fish (^70 cm) was fairly constant 

 except for the 0900-1200 h time period. The 



685 



