AFSC/RACE/MACE: Results of 2007 Pollock Acoustic-Trawl Survey Bering Sea- DY0707

Metadata Updated: December 7, 2020

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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Dates

Metadata Date November 24, 2020
Metadata Created Date October 13, 2020
Metadata Updated Date December 7, 2020
Reference Date(s) 2008 (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from NMFS AFSC

Additional Metadata

Resource Type Dataset
Metadata Date November 24, 2020
Metadata Created Date October 13, 2020
Metadata Updated Date December 7, 2020
Reference Date(s) 2008 (publication)
Responsible Party (Point of Contact, Custodian)
Contact Email
Access Constraints Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/RACE/MACE: Results of 2007 Pollock Acoustic-Trawl Survey Bering Sea- DY0707 [Data Date Range], https://www.fisheries.noaa.gov/inport/item/28407., 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.
Coupled Resource
Frequency Of Update asNeeded
Guid gov.noaa.nmfs.inport:28407
Harvest Object Id 9f186d68-e535-4db6-9f9b-fde1d5a5b105
Harvest Source Id 4ec9cdf0-d791-4933-8ba3-703563ff892e
Harvest Source Title NMFS AFSC
Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
Metadata Language eng
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2007
Temporal Extent End 2008

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