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

Metadata also available as - [Questions & Answers] - [Parseable text] - [DIF]

Metadata:


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Publication_Date: Unpublished material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
Taxonomic_Classification:
Taxon_Rank_Name: Kingdom
Taxon_Rank_Value: Animalia
Taxonomic_Classification:
Taxon_Rank_Name: Phylum
Taxon_Rank_Value: Chordata
Taxonomic_Classification:
Taxon_Rank_Name: Subphylum
Taxon_Rank_Value: Vertebrata
Taxonomic_Classification:
Taxon_Rank_Name: Superclass
Taxon_Rank_Value: Osteichthyes
Taxonomic_Classification:
Taxon_Rank_Name: Class
Taxon_Rank_Value: Actinopterygii
Taxonomic_Classification:
Taxon_Rank_Name: Subclass
Taxon_Rank_Value: Neopterygii
Taxonomic_Classification:
Taxon_Rank_Name: Infraclass
Taxon_Rank_Value: Teleostei
Taxonomic_Classification:
Taxon_Rank_Name: Superorder
Taxon_Rank_Value: Paracanthopterygii
Taxonomic_Classification:
Taxon_Rank_Name: Order
Taxon_Rank_Value: Gadiformes
Taxonomic_Classification:
Taxon_Rank_Name: Family
Taxon_Rank_Value: Gadidae
Taxonomic_Classification:
Taxon_Rank_Name: Subfamily
Taxon_Rank_Value: Gadinae
Taxonomic_Classification:
Taxon_Rank_Name: Genus
Taxon_Rank_Value: Theragra
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Theragra chalcogramma
Applicable_Common_Name: Walleye pollock
Access_Constraints: No restriction for accessing this dataset
Use_Constraints:
This data set as submitted 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. Users should contact the author of the data set to ensure proper interpretation and use of these data.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Resource Assessment and Conservation Engineering Division Alaska Fisheries Science Center, National Marine Fisheries Service National Oceanic and Atmospheric Administration (NOAA)
Contact_Person: Patrick H. Ressler, Ph.D.
Contact_Address:
Address_Type: mailing and physical
Address: 7600 Sand Point Way NE
City: Seattle
State_or_Province: WA
Postal_Code: 98115
Country: USA
Contact_Voice_Telephone: 206-526-4785
Contact_Electronic_Mail_Address: Patrick.Ressler@noaa.gov

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The data are very reliable and have been checked many times for accuracy. No problems remain. Horizontal Positional Accuracy Report: Geographic position is determined using differential GPS. Vertical Positional Accuracy Report: These are depth-integrated measurements. 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). The latitude, longitude, and vessel log distance values represent the along-track starting location for each interval.
Logical_Consistency_Report: See Honkalehto et al. 2010.
Completeness_Report:
See the following references for survey data collection methodology:
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>
Honkalehto, T., N. Williamson, and S. De Blois. 2002. Echo integration-trawl survey results for walleye pollock (Theragra chalcogramma) on the Bering Sea shelf and slope during the summer 1999. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-125, 77 p. (.pdf, 5.74mb) URL: <http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-125.pdf>
Lineage:
Process_Step:
Process_Description:
The NOAA AFSC bottom trawl survey estimates pollock biomass within 3 m of the seafloor. For a formal report of the 2009 bottom trawl survey, see:
Lauth, R. R. 2010. Results of the 2009 eastern Bering Sea continental shelf bottom trawl survey of groundfish and invertebrate resources.U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-204, 228 p. URL: <http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-204.pdf>
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>. The reference and URL for the 2009 stock assessment is:
Ianelli, J.N., Barbeaux, S., Honkalehto, T., Kotwicki, S., Aydin, K., and Williamson, N. Assessment of the walleye pollock stock in the eastern Bering Sea. 2009. Stock Assessment. NPFMC Bering Sea and Aleutian Islands Stock Assessment and Fishery Evaluation (SAFE) Report for 2010. Alaska Fisheries Science Center.
URL: <http://www.afsc.noaa.gov/refm/docs/2009/EBSpollock.pdf>
Process_Date: Unknown

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Depth-integrated midwater pollock biomass summary
Entity_Type_Definition:
Each pollock biomass 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 (averaging distance along the survey transect) and an east-west distance of 20 nmi (interpolation distance 10 nmi to either side of a 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.
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: Longitude
Attribute_Definition: missing or invalid values are indicated by 'NaN'
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -360
Range_Domain_Maximum: 0
Attribute_Units_of_Measure: degrees west of prime meridian (west is negative)
Attribute:
Attribute_Label: Latitude
Attribute_Definition: missing or invalid values are indicated by 'NaN'
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 90
Attribute_Units_of_Measure: degrees north of the equator
Attribute:
Attribute_Label: Pollock biomass
Attribute_Definition: missing or invalid values are indicated by 'NaN'
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: +inf
Attribute_Units_of_Measure: kg
Attribute:
Attribute_Label: Vessel log number (distance along survey track)
Attribute_Definition: missing or invalid values are indicated by 'NaN'
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: +inf
Attribute_Units_of_Measure: nautical miles

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 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: CSV
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: no fee

Metadata_Reference_Information:
Metadata_Date: 20131106
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

This page is <http://www.eol.ucar.edu/projects/bsierp/docs/B62-Midwater_pollock_2009_metadata.html>
Generated by mp version 2.9.23 on Mon Mar 24 15:18:57 2014