Mar 14, 2013 - column to overlap with prey vertical distribution and with light .... OVM or DVM in SEBS walleye pollock early life stages other than this example.
Deep-Sea Research II 94 (2013) 201–210
Contents lists available at ScienceDirect
Deep-Sea Research II journal homepage: www.elsevier.com/locate/dsr2
Vertical distributions of the early life stages of walleye pollock (Theragra chalcogramma) in the Southeastern Bering Sea T.I. Smart a,n, E.C. Siddon b, J.T. Duffy-Anderson c a
School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA 98195, USA Fisheries Division, School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Juneau, AK 99801, USA c RACE Division, Recruitment Processes Program, Alaska Fisheries Science Center, NOAA Fisheries, Seattle, WA 98115, USA b
art ic l e i nf o
a b s t r a c t
Available online 14 March 2013
The present study examines vertical distributions of the early life stages of walleye pollock (Theragra chalcogramma) in the Southeastern Bering Sea to assess ontogenetic and diel vertical migration in relation to development and habitat. Walleye pollock demonstrated a decrease in the depth of occurrence following hatching, indicating an ontogenetic change in vertical distribution. Eggs occurred deepest in the water column and early juveniles occurred shallowest. Vertical distributions were related to the date of collection, water column depth, and thermocline depth. Non-feeding stages (eggs and yolksac larvae,
