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 and July 2008

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Ressler, P.H.

Publication_Date: Unpublished material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 and July 2008

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 2 June to 31 July 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. 2009 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. These data come from a regular stock assessment survey of midwater walleye pollock in the eastern Bering Sea. The digital data file described here was created for submission to the BEST-BSIERP program database. Those with a need for more detail should contact the Author of the data set.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20080602

Ending_Date: 20080731

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unspecified

Spatial_Domain:

Description_of_Geographic_Extent: Eastern Bering Sea shelf

Bounding_Coordinates:

West_Bounding_Coordinate: -180.00000

East_Bounding_Coordinate: -160.00000

North_Bounding_Coordinate: 63.00000

South_Bounding_Coordinate: 54.00000

Keywords:

Theme:

Theme_Keyword_Thesaurus: IOOS Core Variables

Theme_Keyword: Version 1

Theme_Keyword: Fish abundance

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: project_number:B62

Theme_Keyword: data_url:<http://data.eol.ucar.edu/codiac/dss/id=245.B62-004>

Theme_Keyword: archive_url:<http://www.eol.ucar.edu/projects/bsierp>

Access_Constraints:

Access is restricted. Data policy: <http://www.eol.ucar.edu/projects/best/program_management_plan.pdf>

Use_Constraints:

Use is restricted. Data policy: <http://www.eol.ucar.edu/projects/best/program_management_plan.pdf>

Browse_Graphic:

Browse_Graphic_File_Name: pollock_2008.gif

Browse_Graphic_File_Description: Map of depth-integrated midwater pollock biomass, 2008.

Browse_Graphic_File_Type: GIF

Data_Set_Credit:

These data came from a survey conducted by the 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). A citation of the NOAA Technical Memorandum describing the survey data collection, analysis, and results is as follows: HONKALEHTO, T., N. WILLIAMSON, D. JONES, A. McCARTHY, and D. McKELVEY. 2009. Results of the echo integration-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June and July 2008. U. S. Dep. Commer., NOAA Tech. Memo., NMFS-AFSC-194, 56 p. (.pdf, 2 MB). URL:<http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-194.pdf>

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The data are very reliable and have been checked many times for accuracy. No problems remain. Each value is a sum 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 (distance along the survey transect) and an east-west distance of 20 nmi (10 nmi to either side of a survey transect).

Logical_Consistency_Report: See Honkalehto et al. 2009.

Completeness_Report: See Honkalehto et al. 2009.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Geographic position is determined using differential GPS. The latitude, longitude, and vessel log distance values represent the along-track starting location for each interval.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

These are depth-integrated measurements, between 16 m below the sea surface and 3 m above the seafloor.

Lineage:

Methodology:

Methodology_Type: Field

Methodology_Description: Survey data collection methodology

Methodology_Citation:

Citation_Information:

Originator:

HONKALEHTO, T., N. WILLIAMSON, D. JONES, A. McCARTHY, and D. McKELVEY

Publication_Date: 2009

Title:

Results of the echo integration-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June and July 2008

Geospatial_Data_Presentation_Form: document

Series_Information:

Series_Name: NOAA Tech. Memo

Issue_Identification: NMFS-AFSC-194

Other_Citation_Details: Survey data collection methodology.

Online_Linkage:

<http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-194.pdf>

Methodology_Citation:

Citation_Information:

Originator: HONKALEHTO, T., N. WILLIAMSON, and S. De BLOIS

Publication_Date: 2002

Title:

Echo integration-trawl survey results for walleye pollock (Theragra chalcogramma) on the Bering Sea shelf and slope during the summer 1999

Geospatial_Data_Presentation_Form: document

Series_Information:

Series_Name: NOAA Tech. Memo.

Issue_Identification: NMFS-AFSC-125

Other_Citation_Details: Survey data collection methodology.

Online_Linkage:

<http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-125.pdf>

Source_Information:

Source_Citation:

Citation_Information:

Originator: Unknown

Publication_Date: Unknown

Title:

Annual Eastern Bering Sea Continental Shelf Bottom Trawl Survey: Groundfish

Geospatial_Data_Presentation_Form: document

Online_Linkage: <http://www.afsc.noaa.gov/Quarterly/jas2008/divrptsRACE1.htm>

Type_of_Source_Media: online

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2008

Source_Currentness_Reference: Unspecified

Source_Citation_Abbreviation: 2008 survey

Source_Contribution:

2008 NOAA AFSC bottom trawl survey estimates pollock biomass within 3 m of the seafloor. A formal report of the 2008 bottom trawl survey is not yet available.

Source_Information:

Source_Citation:

Citation_Information:

Originator: ACUNA, E., and R. R. LAUTH

Publication_Date: 2008

Title:

Results of the 2007 Eastern Bering Sea continental shelf bottom trawl survey of groundfish and invertebrate resources

Geospatial_Data_Presentation_Form: document

Series_Information:

Series_Name: NOAA Tech. Memo.

Issue_Identification: NMFS-AFSC-181

Online_Linkage:

<http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-181.pdf>

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2007

Source_Currentness_Reference: Unspecified

Source_Citation_Abbreviation: 2007 survey

Source_Contribution:

2007 NOAA AFSC bottom trawl survey estimates pollock biomass within 3 m of the seafloor - a formal report of the 2007 bottom trawl survey.

Source_Information:

Source_Citation:

Citation_Information:

Originator:

Ianelli, J. N., Barbeaux, S., Honkalehto, T., Kotwicki, S., Aydin, K., and Williamson, N.

Publication_Date: 2008

Title:

Assessment of the Walleye Pollock stock in the Eastern Bering Sea. In: Stock assessment and fishery evaluation report for the groundfish resources of the Bering Sea/Aleutian Islands regions.

Geospatial_Data_Presentation_Form: document

Publication_Information:

Publication_Place: Anchorage, AK

Publisher: North Pacific Fishery Management Council

Online_Linkage: <http://www.afsc.noaa.gov/refm/docs/2008/EBSpollock.pdf>

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2008

Source_Currentness_Reference: Unspecified

Source_Citation_Abbreviation: Stock Assessment

Source_Contribution:

Eastern Bering Sea walleye pollock stock assessment documents, which model the annual status of the pollock stock using these and other data sets, can be found at <http://www.afsc.noaa.gov/refm/stocks/assessments.htm>

Process_Step:

Process_Description: Original data delivered

Process_Date: 20091006

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Patrick H Ressler, Ph.D.

Contact_Organization:

NOAA Fisheries, AFSC-RACE, Midwater Assessment and Conservation Engineering

Contact_Address:

Address_Type: mailing

Address: 7600 Sand Point Way NE

City: Seattle

State_or_Province: WA

Postal_Code: 98115

Country: USA

Contact_Voice_Telephone: 206-526-47785

Contact_Electronic_Mail_Address: Patrick.Ressler@noaa.gov

Process_Step:

Process_Description:

New metadata record established for B62 Hollowed. Prepared from supplied file Midwater_pollock_2008_metadata.doc. Name: B62_Hollowed_pollock.xml

Process_Date: 20100112

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: National Center for Atmospheric Research

Contact_Person: Earth Observing Laboratory

Contact_Address:

Address_Type: mailing and physical

Address: 3450 Mitchell Lane

City: Boulder

State_or_Province: CO

Postal_Code: 80301

Country: USA

Contact_Voice_Telephone: 303-497-8154

Contact_Electronic_Mail_Address: codiac@ucar.edu

Contact_Electronic_Mail_Address: stott@ucar.edu

Distribution_Liability:

No warranty expressed or implied is made regarding the accuracy or utility of the data, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with the data. The NCAR and NPRB shall not be held liable for improper or incorrect use of the data described and/or contained herein.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: XLS

File_Decompression_Technique: No compression applied

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://beringsea.eol.ucar.edu>

Digital_Form:

Digital_Transfer_Information:

Format_Name: ASCII

File_Decompression_Technique: No compression applied

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://beringsea.eol.ucar.edu>

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20100111

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: National Center for Atmospheric Research

Contact_Person: Earth Observing Laboratory

Contact_Address:

Address_Type: mailing and physical

Address: 3450 Mitchell Lane

City: Boulder

State_or_Province: CO

Postal_Code: 80301

Country: USA

Contact_Voice_Telephone: 303-497-8154

Contact_Electronic_Mail_Address: codiac@ucar.edu

Contact_Electronic_Mail_Address: stott@ucar.edu

Metadata_Standard_Name:

FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001.1-1999