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Data Set Info
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Summary

Short Citation
Alaska Fisheries Science Center, 2024: AFSC/RACE/MACE: Results of 2007 Pollock Acoustic-Trawl Survey Bering Sea- DY0707, https://www.fisheries.noaa.gov/inport/item/28407.
Full Citation Examples

Abstract

Eastern Bering Sea shelf walleye pollock (Theragra chalcogramma) abundance and distribution in midwater were assessed between 2 June and 30 July 2007 using echo integration-trawl techniques aboard the NOAA ship Oscar Dyson. The survey also assessed walleye pollock in the Russian Cape Navarin area. In general, ocean conditions were cold in 2007, as in 2006. Surface waters averaged 5.0¿C in June and early July, but warmed to an average of 8.9¿C in mid- to late July. The water temperature at 60 m did not exceed 3¿C, except for parts of the outer shelf and slope between Unimak Island and Zhemchug Canyon. Few walleye pollock were found in the survey region between Port Moller and central Unimak Island. A few very dense aggregations were observed along the 100-m isobath east of the Pribilof Islands. More pollock were observed west of the Pribilof Islands on the outer shelf, where a large aggregation of 1-year-olds was observed. Walleye pollock adults and juveniles (primarily age-1 and a few age-2s and -3s) were also abundant in a large area west of St. Matthew Island. Estimated walleye pollock abundance in midwater (between 14 m from the surface and 3 m off bottom) in the U.S. EEZ portion of the Bering Sea shelf was 9.21 billion fish weighing 1.77 million metric tons (t); in the Russian EEZ, it was 1.08 billion fish weighing 0.10 million t (6% of the total midwater biomass). East of 170¿W (13% of total biomass) the predominant length mode was 50 cm. West of 170¿W within the U.S. EEZ (81% of total biomass) modal lengths were 14 and 45 cm. In Russia modal lengths were similar to those in the western U.S. EEZ. Fewer walleye pollock were observed east of 170¿W than in recent years. Inside the U.S. EEZ, juveniles were dominant numerically (61% age-1s, and 11% age-2s) but these two age groups represented only 11% of the total biomass. By contrast, ages 3+ totaled 28% of the population numerically, and made up 89% of the total biomass. Vertical distribution of walleye pollock is discussed, as well as horizontal and vertical distribution of non-pollock backscatter.

Distribution Information

Access Constraints:

None.

Use Constraints:

User must read and fully comprehend the metadata prior to use. User must acknowledge the Originator when using the data set as a source. User must share data products developed using the source data set with the Originator. Data should not be used beyond the limits of the source scale.

Child Items

No Child Items for this record.

Contact Information

Point of Contact
Taina Honkalehto
taina.honkalehto@noaa.gov

Metadata Contact
Abigail McCarthy
abigail.mccarthy@noaa.gov

Extents

Geographic Area 1

Bering Sea: http://www.marineregions.org/gazetteer.php?p=details&id=4310

Time Frame 1
2007 - 2008

Item Identification

Title: AFSC/RACE/MACE: Results of 2007 Pollock Acoustic-Trawl Survey Bering Sea- DY0707
Short Name: Results of 2007 Pollock Acoustic-Trawl Survey Bering Sea- DY0707
Status: Completed
Publication Date: 2008
Abstract:

Eastern Bering Sea shelf walleye pollock (Theragra chalcogramma) abundance and distribution in midwater were assessed between 2 June and 30 July 2007 using echo integration-trawl techniques aboard the NOAA ship Oscar Dyson. The survey also assessed walleye pollock in the Russian Cape Navarin area. In general, ocean conditions were cold in 2007, as in 2006. Surface waters averaged 5.0¿C in June and early July, but warmed to an average of 8.9¿C in mid- to late July. The water temperature at 60 m did not exceed 3¿C, except for parts of the outer shelf and slope between Unimak Island and Zhemchug Canyon. Few walleye pollock were found in the survey region between Port Moller and central Unimak Island. A few very dense aggregations were observed along the 100-m isobath east of the Pribilof Islands. More pollock were observed west of the Pribilof Islands on the outer shelf, where a large aggregation of 1-year-olds was observed. Walleye pollock adults and juveniles (primarily age-1 and a few age-2s and -3s) were also abundant in a large area west of St. Matthew Island. Estimated walleye pollock abundance in midwater (between 14 m from the surface and 3 m off bottom) in the U.S. EEZ portion of the Bering Sea shelf was 9.21 billion fish weighing 1.77 million metric tons (t); in the Russian EEZ, it was 1.08 billion fish weighing 0.10 million t (6% of the total midwater biomass). East of 170¿W (13% of total biomass) the predominant length mode was 50 cm. West of 170¿W within the U.S. EEZ (81% of total biomass) modal lengths were 14 and 45 cm. In Russia modal lengths were similar to those in the western U.S. EEZ. Fewer walleye pollock were observed east of 170¿W than in recent years. Inside the U.S. EEZ, juveniles were dominant numerically (61% age-1s, and 11% age-2s) but these two age groups represented only 11% of the total biomass. By contrast, ages 3+ totaled 28% of the population numerically, and made up 89% of the total biomass. Vertical distribution of walleye pollock is discussed, as well as horizontal and vertical distribution of non-pollock backscatter.

Physical Location

Organization: Alaska Fisheries Science Center
City: Seattle
State/Province: WA
Country: USA

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Binary
Maintenance Frequency: As Needed
Data Presentation Form: Simrad RAW file format

Support Roles

Data Steward

CC ID: 241730
Date Effective From: 2015-10-29
Date Effective To:
Contact (Person): Towler, Rick
Email Address: rick.towler@noaa.gov

Distributor

CC ID: 241732
Date Effective From: 2015-10-28
Date Effective To:
Contact (Organization): Alaska Fisheries Science Center (AFSC)
Address: 7600 Sand Point Way N.E., Building 4
Seattle, WA 98115
USA
Email Address: afsc.webmaster@noaa.gov
Phone: (206) 526-4000
Fax: (206) 526-4004
URL: https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
Business Hours: 0700-1700 Pacific Time

Metadata Contact

CC ID: 241729
Date Effective From: 2015-10-29
Date Effective To:
Contact (Person): McCarthy, Abigail
Email Address: abigail.mccarthy@noaa.gov

Point of Contact

CC ID: 241731
Date Effective From: 2015-10-28
Date Effective To:
Contact (Person): Honkalehto, Taina
Email Address: taina.honkalehto@noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 241734
Description

Bering Sea: http://www.marineregions.org/gazetteer.php?p=details&id=4310

Extent Group 1 / Time Frame 1

CC ID: 241735
Time Frame Type: Range
Start: 2007
End: 2008

Access Information

Security Class: Unclassified
Data Access Procedure:

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

Data Access Constraints:

None.

Data Use Constraints:

User must read and fully comprehend the metadata prior to use. User must acknowledge the Originator when using the data set as a source. User must share data products developed using the source data set with the Originator. Data should not be used beyond the limits of the source scale.

Distribution Information

Distribution 1

CC ID: 241733
Download URL: https://www.ncei.noaa.gov/
Distributor:

Data Quality

Quality Control Procedures Employed:

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

Data Management

Have Resources for Management of these Data Been Identified?: No
Approximate Percentage of Budget for these Data Devoted to Data Management: Unknown
Do these Data Comply with the Data Access Directive?: Yes
Is Access to the Data Limited Based on an Approved Waiver?: Yes
Approximate Delay Between Data Collection and Dissemination: 180
Actual or Planned Long-Term Data Archive Location: NCEI-CO
Approximate Delay Between Data Collection and Archiving: 180
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

"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."

Lineage

Lineage Statement:

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

Catalog Details

Catalog Item ID: 28407
GUID: gov.noaa.nmfs.inport:28407
Metadata Record Created By: Abigail McCarthy
Metadata Record Created: 2015-10-29 16:28+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2024-01-15 12:08+0000
Metadata Record Published: 2016-05-18
Owner Org: AFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2016-05-18
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2017-05-18