FISHERY BULLETIN: VOL. 83, NO. 4 



Figure 1.— Location of the study area of pink shrimp and Pacific cod (55 m isobath indicated by dotted/dash-line). 



laboratory, prey items were sorted to the lowest 

 possible taxon. Frequency of occurrence (number of 

 stomachs containing the food item), number of each 

 prey item, volume by water displacement (nearest 

 0.1 mL), and wet weight (nearest gram) were record- 

 ed. From these measurements, percentages by fre- 

 quency of occurrence, number, and volume were 

 calculated from non-empty stomachs only. 



Size composition was recorded for prey species of 

 commercial importance including pink shrimp 



(carapace length, CL); humpy shrimp, Pandalus 

 goniuriLs, CL; snow (Tknner) crab, Chionoecetes bair- 

 di, carapace width (CW); and walleye pollock, 

 Theragra chalcogramma, fork length (FL). Addi- 

 tionally, size composition was recorded for samples 

 of pink shrimp (CL), humpy shrimp (CL), Pacific cod 

 (FL), and walleye pollock (FL) caught in each tow. 

 lb determine if Pacific cod were feeding on 

 selected sizes of pink shrimp, the Kolmogorov- 

 Smirnov test (Sokal and Rohlf 1969) was used to test 



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