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

Metadata Updated: May 31, 2016

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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Metadata Date May 18, 2016
Metadata Created Date May 31, 2016
Metadata Updated Date May 31, 2016
Reference Date(s) (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from NOAA CSW Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date May 18, 2016
Metadata Created Date May 31, 2016
Metadata Updated Date May 31, 2016
Reference Date(s) (publication)
Responsible Party (Point of Contact)
Contact Email
Access Constraints 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
Guid gov.noaa.nmfs.inport:28019
Harvest Object Id d7d2aff6-ee44-4e90-bcc1-041c825895e1
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Metadata Language eng
Metadata Type geospatial
Progress onGoing
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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