510 



Fishery Bulletin 90(3), 1992 



Q 



Z 



o 

 z 

 2 



46 



40 



2 



Q 



Z 



o 



z 



z 



SHORTBELLY 

 ROCKFISH PREY 



M2 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 



BOCACCIO PREY 



CHILIPEPPER PREY 



IM. 



fc,r^ 



^ CALANUS SPP. 

 g^ COPEPOD JUV. 

 T77\ UNID. COPEPODS 

 ^ EUPH. EGGS 

 {^J EUPH. JUV. 



Figure 2 



Histograms of the prey ranking index across years for five species of pelagic juvenile Sebastes. Calanus spp. 

 = CalaniLs spp. copopods; copepod juv. = copopod juveniles; unid. copepods = unidentified copepods; euph. 

 eggs = euphausiid eggs; euph. juv. = euphausiid juveniles. 



prey. Likewise, 1985 was a year in which copepod 

 juveniles and euphausiid eggs dominated the diets of 

 the three species examined (widow, yellowtail, and 

 shortbeily rockfish) and copepod juveniles were again 

 important to all species in 1986. 



Interspecific prey utilization patterns were less ob- 

 vious. There is some indication that widow and chili- 

 pepper rockfish consumed more copepod juveniles and 

 Calanus spp. copepods than did the other species. 



Similarly, shortbeily rockfish appeared to consume 

 more euphausiid eggs, while bocaccio consumed more 

 euphausiid juveniles. Likewise, there was some sugges- 

 tion that bocaccio fed on larger prey than the other 

 species (e.g., euphausiid adults and fish larvae). 

 Nonetheless, no distinctive separation in primary prey 

 species was evident among the five species examined. 

 Based on the Ir ranking index, it is apparent that 

 the diet of pelagic juveniles is typically dominated by 



