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Summary

Short Citation
Alaska Fisheries Science Center, 2024: AFSC/RACE/MACE: Results of 2009 Pollock Acoustic-Trawl Survey Bering Sea- DY0909, https://www.fisheries.noaa.gov/inport/item/28408.
Full Citation Examples

Abstract

Eastern Bering Sea shelf walleye pollock (Theragra chalcogramma) abundance and distribution in midwater were assessed between 9 June and 7 August 2009 using acoustic-trawl techniques aboard the NOAA ship Oscar Dyson. The survey also assessed walleye pollock in the Cape Navarin area of Russia. Results showed that ocean conditions were cold in 2009, as in the previous three years, compared to 2001-2005. Fewer pollock were observed east of 170¿W than in 2008, and a larger percentage of those were inside the Steller sea lion Conservation Area (SCA) than outside the SCA (79% in 2009, 70% in 2008). The majority of the pollock biomass in the U.S. Exclusive Economic Zone (EEZ) was located to the west and northwest of the Pribilof Islands between the 100 m and 200 m isobaths. Estimated pollock abundance in midwater (between 16 m from the surface and 3 m off bottom) in the U.S. EEZ portion of the Bering Sea shelf was 8.08 billion fish weighing 0.924 million metric tons (t); in the Russian EEZ, there were 9.67 million fish weighing 0.005 million t (0.6% of the total midwater biomass). East of 170¿W, (9.6% of total biomass) the predominant length mode was 55 cm both inside and outside of the SCA. In the U.S. west of 170¿W (89.8% of total biomass) dominant modal lengths were 13, 31, and 23 cm, respectively. In Russia, modal lengths were 43, 51, and 29 cm, with proportionally more adults and fewer juveniles than in the adjacent western U.S. EEZ. Age results indicated that inside the U.S. EEZ, juvenile walleye pollock (ages-1, -2, and -3) were dominant numerically (64%, 10%, and 21%, respectively) and represented 63% of the total biomass. Adult pollock (ages 4+) totaled 6% of the population numerically and 37% of the total biomass. Vertical distribution analyses indicated that 93% of adult biomass was within 40 m of the seafloor. Juveniles were found both near the seafloor and higher in the water column; 17% of juvenile biomass was within 50 m of the surface. Three dimensional size and shape patterns of the juveniles are described using data collected with a calibrated multibeam sonar, and variability in these patterns are explored as a function of ontogeny. Finally, a new euphausiid index of abundance computed from backscatter at 4 frequencies (18, 38, 120, and 200 kHz) is described.

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
2004 - Present

Item Identification

Title: AFSC/RACE/MACE: Results of 2009 Pollock Acoustic-Trawl Survey Bering Sea- DY0909
Short Name: Results of 2009 Pollock Acoustic-Trawl Survey Bering Sea- DY0909
Status: Completed
Publication Date: 2010
Abstract:

Eastern Bering Sea shelf walleye pollock (Theragra chalcogramma) abundance and distribution in midwater were assessed between 9 June and 7 August 2009 using acoustic-trawl techniques aboard the NOAA ship Oscar Dyson. The survey also assessed walleye pollock in the Cape Navarin area of Russia. Results showed that ocean conditions were cold in 2009, as in the previous three years, compared to 2001-2005. Fewer pollock were observed east of 170¿W than in 2008, and a larger percentage of those were inside the Steller sea lion Conservation Area (SCA) than outside the SCA (79% in 2009, 70% in 2008). The majority of the pollock biomass in the U.S. Exclusive Economic Zone (EEZ) was located to the west and northwest of the Pribilof Islands between the 100 m and 200 m isobaths. Estimated pollock abundance in midwater (between 16 m from the surface and 3 m off bottom) in the U.S. EEZ portion of the Bering Sea shelf was 8.08 billion fish weighing 0.924 million metric tons (t); in the Russian EEZ, there were 9.67 million fish weighing 0.005 million t (0.6% of the total midwater biomass). East of 170¿W, (9.6% of total biomass) the predominant length mode was 55 cm both inside and outside of the SCA. In the U.S. west of 170¿W (89.8% of total biomass) dominant modal lengths were 13, 31, and 23 cm, respectively. In Russia, modal lengths were 43, 51, and 29 cm, with proportionally more adults and fewer juveniles than in the adjacent western U.S. EEZ. Age results indicated that inside the U.S. EEZ, juvenile walleye pollock (ages-1, -2, and -3) were dominant numerically (64%, 10%, and 21%, respectively) and represented 63% of the total biomass. Adult pollock (ages 4+) totaled 6% of the population numerically and 37% of the total biomass. Vertical distribution analyses indicated that 93% of adult biomass was within 40 m of the seafloor. Juveniles were found both near the seafloor and higher in the water column; 17% of juvenile biomass was within 50 m of the surface. Three dimensional size and shape patterns of the juveniles are described using data collected with a calibrated multibeam sonar, and variability in these patterns are explored as a function of ontogeny. Finally, a new euphausiid index of abundance computed from backscatter at 4 frequencies (18, 38, 120, and 200 kHz) is described.

Other Citation Details:

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.

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: 269895
Date Effective From: 2015-10-29
Date Effective To:
Contact (Person): Towler, Rick
Email Address: rick.towler@noaa.gov

Distributor

CC ID: 269897
Date Effective From: 2015
Date Effective To:
Contact (Person): Anderson, Charles
Address: 325 Broadway, E/GC3
Boulder, CO 33149
Email Address: charles.anderson@noaa.gov
Phone: 303-497-4742

Metadata Contact

CC ID: 269894
Date Effective From: 2015-10-29
Date Effective To:
Contact (Person): McCarthy, Abigail
Email Address: abigail.mccarthy@noaa.gov

Point of Contact

CC ID: 269896
Date Effective From: 2015-10-28
Date Effective To:
Contact (Person): Honkalehto, Taina
Email Address: taina.honkalehto@noaa.gov

Extents

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 269901
Description

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

Extent Group 1 / Time Frame 1

CC ID: 269902
Time Frame Type: Continuing
Start: 2004

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: 736270
Download URL: http://doi.org/10.7289/V5DJ5CPR
Distributor:

Distribution 2

CC ID: 736269
Download URL: http://doi.org/10.7289/V5J67F1M
Distributor:

Distribution 3

CC ID: 269899
Download URL: https://www.ngdc.noaa.gov/mgg/wcd/
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: 28408
GUID: gov.noaa.nmfs.inport:28408
Metadata Record Created By: Abigail McCarthy
Metadata Record Created: 2015-10-29 16:57+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+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