AFSC/RACE/MACE: Results of 2006 Pollock Acoustic-Trawl Survey Bering Sea- DY0606

Scientists from the Alaska Fisheries Science Center’s (AFSC) Midwater Assessment and Conservation Engineering (MACE) Program conduct biennial echo integration-trawl (EIT) surveys (e.g., Honkalehto et al., 2002) along the eastern Bering Sea shelf during the summer to estimate the abundance and distribution of walleye pollock (Theragra chalcogramma). This report summarizes observed walleye pollock distribution, and provides walleye pollock biomass and abundance estimates by size and age for the EIT survey conducted in June-July 2006 within the U.S. Exclusive Economic Zone (EEZ). An inter-vessel acoustic comparison between the NOAA ships Miller Freeman and Oscar Dyson was also conducted during the cruise and results will be presented elsewhere (De Robertis et al., in press).

McKelvey, D., N. Williamson, and T. Honkalehto. 2007. Results of the echo

integration-trawl survey of walleye pollock (Theragra chalcogramma) on the

Bering Sea shelf in June and July 2006. AFSC Processed Rep. 2007-08, 40 p.

Alaska Fish. Sci. Cent., NOAA, Natl. Mar, Fish. Serv., 7600 Sand Point Way NE,

Seattle WA 98115.

Go to https://www.ngdc.noaa.gov/mgg/wcd/ or email Anderson, Charles (charles.anderson@noaa.gov)

"FISMA Controls are in place to protect stored data from unauthorized access and/or disclosure"

These data were collected in accordance NOAA protocols for fisheries acoustics surveys and related sampling (Alaska Fisheries Science Center), 23 p. Prepared by Midwater Assessment and Conservation Engineering Program, Alaska Fish. Sci. Center, Natl. Mar. Fish. Serv., NOAA. Available online: http://www.afsc.noaa.gov/RACE/midwater/AFSC%20AT%20Survey%20Protocols_Feb%202013.pdf

"IT Security and Contingency Plan for the system establishes procedures and applies to the functions, operations, and resources necessary to recover and restore data as hosted in the Western Regional Support Center in Seattle, Washington, following a disruption."

Acoustic data were recorded at the five split-beam frequencies using ER60 software and, as a backup, acoustic telegram data were logged with Myriax EchoLog 500 software. Acoustic measurements were collected from 16 m below the sea surface to within 0.5 m of the sounder-detected bottom or a maximum of 1,000 m in deep water. Data were analyzed using Myriax Echoview post-processing software. See National Marine Fisheries Service (NMFS) 2013. NOAA protocols for fisheries acoustics surveys and related sampling (Alaska Fisheries Science Center), 23 p. Prepared by Midwater Assessment and Conservation Engineering Program, Alaska Fish. Sci. Center, Natl. Mar. Fish. Serv., NOAA. Available online: http://www.afsc.noaa.gov/RACE/midwater/AFSC%20AT%20Survey%20Protocols_Feb%202013.pdf