| Shelikof Strait Acoustic-Trawl Survey of Walleye Pollock (DY1002, ME70) |
| The Midwater Assessment and Conservation Engineering (MACE) program of the Alaska
Fisheries Science Center (AFSC; NOAA National Marine Fisheries Service) conducted
an acoustic-trawl (AT) stock assessment survey in the central Gulf of Alaska (GOA)
and Shelikof Strait during late winter/early spring of 2010 to estimate the distribution
and abundance of walleye pollock (Gadus chalcogrammus). The survey was conducted between
18 and 30 March, 2010, and included the central Gulf of Alaska along the shelf break
east of Chirikof Island and throughout Shelikof Strait. The survey was conducted onboard
NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic
instrumentation in addition to biological sampling capabilities. The primary instrumentation
for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies
(18, 38, 70, 120, and 200 kHz) and a Simrad ME70 multibeam echosounder, with the ME70
transmit pulse synchronized to the EK60 system. This data set includes Kongsberg Simrad
ME70 raw multibeam data, Seabird CTD data, and ship?s navigation/oceanographic/meterological
sensor data. |
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