Depth-integrated midwater pollock biomass summary from echo integration-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June, July, and August 2009

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Ressler, Patrick H.
Originator:: Midwater Assessment Program (MACE) of the Resource Assessment and Conservation Engineering Division (RACE) of the NOAA National Marine Fisheries Service Alaska Fisheries Science Center (AFSC)
Publication_Date: Unpublished material
Title:: Depth-integrated midwater pollock biomass summary from echo integration-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June, July, and August 2009
Geospatial_Data_Presentation_Form: digital

Description:

Abstract:: Midwater walleye pollock biomass is measured during annual or biennial acoustic-trawl surveys conducted by the Midwater Assessment and Conservation Engineering (MACE) Program, Resource Assessment and Conservation Engineering (RACE) Division, of the NOAA-NMFS Alaska Fisheries Science Center (AFSC). In 2008, the survey was conducted from 9 June to 7 August using the NOAA Ship Oscar Dyson. Acoustic backscatter at 38 kHz was measured along north-south survey transects spaced at an east-west distance of 20 nautical miles (nmi); backscatter was classified through visual examination of the data by trained analysts. Midwater and bottom trawling was used to determine the species and length frequency composition of detected aggregations of fish. Pollock biomass (kg) was computed by applying length-specific target strength values and a length-weight relationship to 38 kHz backscatter data classified as pollock. The summary data set submitted here includes pollock biomass values summed between 16 m below the sea surface and 3 m above the seafloor within a rectangle with a north-south distance of 0.5 nmi (averaging distance along the survey transect) and an east-west distance of 20 nmi (interpolation distance 10 nmi to either side of the survey transect). The latitude, longitude, and vessel log distance values represent the starting location for each interval along the transect. The sum of biomass in all of these intervals will yield the sum total midwater pollock biomass measured by the survey. Further information and detail on the midwater pollock survey data can be found by consulting Honkelehto et al. 2010 or by contacting the author of this data set.
Purpose:: The purpose of the submitted data set is to provide a spatially explicit estimate of midwater pollock biomass for use according to the BEST-BSIERP data policy. Those with a need for more detail should contact the Author of the data set.
Supplemental_Information:: This data set as submitted to the database is unpublished. Use and citation of these data must conform to the BEST-BSIERP data policy (<http://www.eol.ucar.edu/projects/best/program_management_plan.pdf>) and standard scientific practice. The following is a publication about the data that describes the methods used to generate them and the survey analysis completed using the same source data:
Honkalehto, T., A. McCarthy, P. Ressler, S. Stienessen, and D. Jones. 2010. Results of the acoustic-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June - August 2009 (DY0909). AFSC Processed Rep. 2010-03, 57 p. Alaska Fish. Sci. Cent., NOAA, Natl. Mar. Fish. Serv., 7600 Sand Point Way NE, Seattle WA 98115. URL: <http://www.afsc.noaa.gov/Publications/ProcRpt/PR2010-03.pdf>

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20090609
Ending_Date: 20090807

Currentness_Reference: Start and end dates of the survey

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Description_of_Geographic_Extent: Eastern Bering Sea Shelf

Bounding_Coordinates:

West_Bounding_Coordinate: 175.0
East_Bounding_Coordinate: -160.0
North_Bounding_Coordinate: 63.0
South_Bounding_Coordinate: 54.0

Keywords:

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: project_number:B62
Theme_Keyword: data_url:<http://data.eol.ucar.edu/codiac/dss/id=245.B62-016>
Theme_Keyword: archive_url:<http://www.eol.ucar.edu/projects/bsierp>

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: Bering Sea
Place_Keyword: Alaska
Place_Keyword: AK

Taxonomy:

Keywords/Taxon:

Taxonomic_Keyword_Thesaurus: None
Taxonomic_Keywords: Walleye pollock
Taxonomic_Keywords: Theragra chalcogramma