FISHERY BULLETIN: VOL. m. NO. J 



Table 2 —Importance of the prey fish by depth found in the stomachs of Greenland halibut collected from the eastern Bering Sea. 

 = percent frequency of occurrence, %N = percent by number, %W = percent by weight. 



%F0 



lOOf- 



90 



c 

 o 



Q. 



u 



03 



E 

 o 



Q. 



E 



LU 



80 



70 



60 



50 



40 



30 - 



20 



10 - 



Spring 



Summer 



Autumn 



Figure 5.— Percent of empty stomachs by season and Greenland halibut size. (Numbers are 



sample sizes.) 



stomach content weight of the fish 50-69 cm was 

 also fairly constant although much less than in the 

 larger fish. Although a midday drop in stomach con- 

 tent weight occurred in the two larger size groups, 

 stomach content weight for the smallest size group 

 appeared to steadily increase from 0100 h to 1200 

 h. The stomach content weight was highest but most 

 variable in size group 30-49 cm during the 

 1500-1800 h time period. 



Daily Ration 



The mean stomach content weight and the daily 

 ration varied among three size groups of Greenland 

 halibut (Table 3). By percent body weight, the mean 

 stomach content weight for 30-49 cm and 50-69 cm 

 size groups were 1.4% and 1.3% respectively. Fish 

 ^70 cm had the greatest mean stomach content 

 weight (2.4% of body weight). Since gastric evacu- 



686 



