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Fishery Bulletin 90(3). 1992 



Results 



Frequency of occurrence 

 and percent number 



Stomachs from 1088 pelagic juvenile 

 rockfish collected from midwater 

 trawls during the four survey years 

 (Table 1) were examined. Frequency of 

 occurrence and percent number for 

 specific prey types of each rockfish 

 species varied considerably from year 

 to year (Tables 2-5). In 1984, bocac- 

 cio differed from all other rockfish 

 species in the frequency of occurrence 

 of fish larvae as a prey type (Table 2). 

 Euphausiid eggs occurred in the 

 stomachs of all three species in 1985, 

 although there is a disparity in the per- 

 cent number (Table 3). Euphausiid 

 eggs were much less frequent in the 

 diets of the three rockfish species in 

 1986 (Table 4), whereas juvenile eu- 

 phausiids occurred more frequently. 

 Overall, data from 1984-87 show that 

 prey items having a high frequency of 

 occurrence generally had a high per- 

 centage by number. Euphausiid eggs 

 and juveniles and unidentified cope- 

 pods often had high percentages by 

 number relative to their frequencies of 



