2015 Pollock Acoustic/Trawl Survey Gulf of Alaska EK60 Raw Data

Metadata Updated: December 11, 2021

Scientists from the Midwater Assessment and Conservation Engineering (MACE) Program of the Alaska Fisheries Science Center's (AFSC) Resource Assessment and Conservation Engineering (RACE) Division conducted an acoustic-trawl (AT) stock assessment survey of the western Gulf of Alaska (GOA) shelf to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus) in summer 2015. Previous surveys of the GOA were also conducted during the summers of 2003, 2005, 2011, and 2013 by MACE. The 2015 survey covered the shelf from the Islands of Four Mountains to Yakutat Trough including many associated bays and troughs. The biomass estimate for the entire survey area was 1,482,668 t. The majority of the pollock observed were located on the continental shelf (64%), Shelikof Strait (19%), east of Kodiak Island in Chiniak (2%) and Barnabas Troughs (6%), and in Marmot Bay (3%). The vast majority (91%) of the biomass for the entire survey was from fish 30-50 cm in length (likely mostly age-3 fish), Fish weight at length was slightly lower in fish greater than 40 cm FL compared to surveys conducted in the summer GOA in previous years. Backscatter was attributed to other species where possible. A biomass estimate was also calculated for Pacific ocean perch (Sebastes alutus, 407,988 t) and the relative abundance and distribution for euphausiids (primarily consisting of Thysanoessa inermis, but also including T. spinifera, T. raschii, and Euphausia pacifica) was estimated.

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License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date November 30, 2021
Metadata Created Date November 12, 2020
Metadata Updated Date December 11, 2021
Reference Date(s) (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from NMFS AFSC

Additional Metadata

Resource Type Dataset
Metadata Date November 30, 2021
Metadata Created Date November 12, 2020
Metadata Updated Date December 11, 2021
Reference Date(s) (publication)
Responsible Party (Point of Contact, Custodian)
Contact Email
Guid gov.noaa.nmfs.inport:28019
Access Constraints Cite As: Alaska Fisheries Science Center, [Date of Access]: 2015 Pollock Acoustic/Trawl Survey Gulf of Alaska EK60 Raw Data [Data Date Range], https://www.fisheries.noaa.gov/inport/item/28019., Access Constraints: The data set is still being analyzed and will not be available for distribution until it has been finalized and all QA/QC practices have been performed. Contact the Data Point Of Contact for estimated time of release. | 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.
Bbox East Long -138
Bbox North Lat 62
Bbox South Lat 52
Bbox West Long -172
Coupled Resource
Frequency Of Update notPlanned
Harvest Object Id ffd8c72b-87d4-4061-aa8e-4e7a2029a3ba
Harvest Source Id 26a29bb9-50b0-47fd-920b-edc74aa6ec76
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
Old Spatial {"type": "Polygon", "coordinates": [[[-172.0, 52.0], [-138.0, 52.0], [-138.0, 62.0], [-172.0, 62.0], [-172.0, 52.0]]]}
Progress underDevelopment
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2015-06-11
Temporal Extent End 2015-08-16

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