NOTE Carlson: Yearly appearance of Theragra chalcogramma off southeastern Alaska 



389 



out the water column ( Bruce et al., 1977). Generally, 

 by this time zooplankton abundance had declined, 

 daylight was greatly reduced (Carlson, 1980), and 

 juvenile pollock feeding had shifted from copepods 

 to larger prey — mainly mysids and euphausiids 

 (Krieger, 1985). The young pollock appeared to move 

 deeper in response to these changing oceanographic 

 and trophic conditions. 



Each year, this pattern of appearance of juvenile 

 pollock repeated itself with few exceptions and with 

 remarkable predictability; it was generally consis- 

 tent in timing, location, depth, and size of fish. The 

 consistent residency at the same site, around the 

 same time, by young-of-the-year walleye pollock for 

 22 consecutive years, demonstrates the long-term 

 significance and potential importance of locales such 

 as Auke Bay as nursery grounds for this species. 



Acknowledgments 



I wish to thank all my colleagues at the National 

 Marine Fisheries Service Auke Bay Laboratory who 

 helped with this study, particularly M. L. Dahlberg and 

 K. J. Krieger, who also participated underwater. 



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