AFSC/RACE/MACE: Results of 2007 Pollock Acoustic-Trawl Survey Bering Sea- DY0707
Alaska Fisheries Science Center
Data Set
(DS)
| ID: 28407
| Published / External
Created: 2015-10-29
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Last Modified: 2024-01-15
Project (PRJ) | ID: 28146
ID: 28407
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | AFSC/RACE/MACE: Results of 2007 Pollock Acoustic-Trawl Survey Bering Sea- DY0707 |
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Short Name | Results of 2007 Pollock Acoustic-Trawl Survey Bering Sea- DY0707 |
* Status | Completed |
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• 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. |
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• » Organization | Alaska Fisheries Science Center |
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• » City | Seattle |
• » State/Province | WA |
• Country | USA |
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* 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 |
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Person | Towler, Rick |
Email Address | rick.towler@noaa.gov |
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* » Support Role | Distributor |
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* » Date Effective From | 2015-10-28 |
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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 |
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URL | https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center |
Business Hours | 0700-1700 Pacific Time |
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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 | 2007 |
End | 2008 |
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» Data Access Procedure |
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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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. |
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» Download URL | https://www.ncei.noaa.gov/ |
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URL | http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-190.pdf |
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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." |
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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 | 28407 |
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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 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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