NOTE Yang: The trophic role of P/eurogrammus monopterygius 



1051 



(11 mm SL), one zoarcid (61.4 mm SL), one 

 myctophiii (59 mm SL), anci one stichaeid 

 (29 mm SL). 



Consumption of Atka mackerel at the 

 population level 



The dominant predator species. Pacific cod 

 and Pacific halibut, consumed large 

 amounts of Atka mackerel (Table 5). The 

 estimated amount of Atka mackerel con- 

 sumed by each species varied by predator 

 size as well as by the location where the 

 predator was collected. For Pacific cod, 

 large fish (>60 cm) in the western and cen- 

 tral Aleutian areas consumed between 

 14,000 and 18,000 t of Atka mackerel. For 

 Pacific halibut, large fish (>80 cm) con- 

 sumed between 2000 and 4000 t in the 

 western and central Aleutian Islands ar- 

 eas. Consumption of Atka mackerel by 

 arrowtooth flounder was found in samples 



n=11 



132 





CL 



100 



I •"■n- 



Axv^>^xy 



Prey Key 

 : Misc. prey 



Cephafopod 

 1 Other crustacean 

 SCalanoid 

 'Euphausiid 

 ALarvacean 

 jMisc. fish 

  Atka mackerel eggs 



20 



Pre(Jator fork length (cm) 



Figure 2 



Variation in the main food items of Atka mackerel, by predator size, in 

 the Aleutian Islands area in 1991. n = sample size. 



