NOTE Yang: The trophic role of Pleurogrammus monopterygius 



1053 



Atka mackerel as predator 



Atka mackerel have been documented as predators 

 of both planktonic invertebrates and teleosts in both 



the western and central North Pacific Ocean. Sim- 

 enstad et al. (1977) found that planktonic crusta- 

 ceans, hyperiid amphipods, calanoid copepods, and 

 oikopleura (larvaceans) occurred frequently in Atka 



