| The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National
Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted
an acoustic-trawl (AT) stock assessment survey in the Shelikof Strait, Marmot Bay,
and Izhut Bay areas of the Gulf of Alaska (GOA) during late winter/early spring of
2014 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus).
The survey was conducted 13-25 March (Shelikof Strait 15-22 March; Marmot and Izhut
Bays 22-24 March), departing from Dutch Harbor, Alaska and ending in Kodiak, Alaska.
The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped
with acoustic and oceanographic instrumentation. The primary instrument for the survey
was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38,
70, 120, and 200 kHz). |