Results of 2012 Pollock Acoustic-Trawl Survey Bering Sea- DY1207
Alaska Fisheries Science Center
Data Set
(DS)
| ID: 28307
| Published / External
Created: 2015-10-28
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Last Modified: 2022-08-09
Project (PRJ) | ID: 28146
ID: 28307
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | Results of 2012 Pollock Acoustic-Trawl Survey Bering Sea- DY1207 |
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Short Name | Results of 2012 Pollock Acoustic-Trawl Survey Bering Sea- DY1207 |
* Status | Completed |
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Revision Date | |
• Publication Date | 2013 |
* » Abstract |
Eastern Bering Sea shelf walleye pollock (Theragra chalcogramma) midwater abundance and distribution were assessed from Bristol Bay in the United States, to Cape Navarin, Russia, between 7 June and 10 August 2012 using acoustic-trawl techniques aboard the NOAA ship Oscar Dyson. Most of the pollock biomass in the U.S. exclusive economic zone (EEZ) was distributed between the Pribilof Islands and Cape Navarin, between roughly the 80 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 1.843 million metric tons (t), lower than in 2010 (2.323 million t) but higher than in 2009 or 2008 (0.924 million t, and 0.997 million t, respectively). Pollock biomass east of 170° W was 0.279 million t, the predominant length mode was 47-48 cm, and most ages ranged between 4 and 7 years. In the U.S. waters west of 170° W, pollock biomass was 1.563 million t (65.4% of total shelf-wide biomass), and dominant modal lengths were 23, 38, and 30 cm, corresponding to pollock aged 2, 4, and 3 years, respectively. In Russia (0.550 million t, 23% of total biomass), modal lengths and ages were similar, though generally smaller and younger than those in the U.S. waters west of 170° W. Vertical distribution analyses indicated that whereas 80-90% of the adults were within 50 m of the bottom only about 60% of the juveniles were observed in that depth layer. Results of a paired (midwater-bottom) trawl efficiency comparison project are presented. The preliminary spatial distribution of the euphausiid abundance index is presented, but analyses are still in progress. |
* Purpose |
The midwater pollock population estimates from the acoustic-trawl survey is one of three key inputs for the pollock stock assessment model, which in turn guides the North Pacific Fisheries Management Council’s annual decisions on U.S. Bering Sea pollock stock management. (Additional key inputs are demersal pollock population estimates from an annual NOAA Bering Sea bottom trawl survey, and biological data from the pollock fishing industry.) |
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Keywords
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None | Acoustic trawl surveys |
None | Bering Sea |
None | Gadus chalcogrammus |
None | Walleye pollock |
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Physical Location
• » Organization | Alaska Fisheries Science Center |
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• » City | Seattle |
• » State/Province | WA |
• Country | USA |
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Data Set Information
* Data Set Scope Code | Data Set |
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• Data Set Type | Binary |
• Maintenance Frequency | As Needed |
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» Data Presentation Form | Simrad RAW file format |
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* » Support Role | Data Steward |
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* » Date Effective From | 2015-10-29 |
Date Effective To | |
Person | Towler, Rick |
Email Address | rick.towler@noaa.gov |
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* » Support Role | Distributor |
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* » Date Effective From | 2015 |
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Person | Anderson, Charles |
Address |
325 Broadway, E/GC3 Boulder, CO 33149 |
Email Address | charles.anderson@noaa.gov |
Phone | 303-497-4742 |
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* » Support Role | Metadata Contact |
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* » Date Effective From | 2015-10-29 |
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Person | McCarthy, Abigail |
Email Address | abigail.mccarthy@noaa.gov |
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* » Support Role | Point of Contact |
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* » Date Effective From | 2015-10-28 |
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Person | Honkalehto, Taina |
Email Address | taina.honkalehto@noaa.gov |
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* » Description |
Bering Sea: http://www.marineregions.org/gazetteer.php?p=details&id=4310 |
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* » Time Frame Type | Range |
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* » Start | 2012-05 |
End | 2012-09 |
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* » Security Class | Unclassified |
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Go to https://www.ngdc.noaa.gov/mgg/wcd/ or email Anderson, Charles (charles.anderson@noaa.gov) |
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None |
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» Download URL | http://doi.org/10.7289/V5KK98PX |
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» Download URL | http://doi.org/10.7289/V5V40S4J |
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URL | http://www.afsc.noaa.gov/Publications/ProcRpt/PR2013-02.pdf |
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» 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 |
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» 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 |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | 180 |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed | |
» 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 |
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Catalog Details
Catalog Item ID | 28307 |
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Metadata Record Created By | Abigail McCarthy |
Metadata Record Created | 2015-10-28 17:53+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 Workflow State | Published / External |
Metadata Last Review Date | 2016-05-18 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2017-05-18 |
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