Assessment of the walleye pollock stock in the Gulf of Alaska

Dorn, Martin; Aydin, Kerim; Fissel, Ben; Jones, Darin; McCarthy, Abigail; Palsson, Wayne; Spalinger, Kally

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Assessment of the walleye pollock stock in the Gulf of Alaska

2017
By Dorn, Martin ; Aydin, Kerim ; Fissel, Ben ; ...
Series: Gulf of Alaska Stock Assessments

[PDF-2.40 MB]

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Details:

Alternative Title:

GOA Chapter 1
Personal Author:

Dorn, Martin ; Aydin, Kerim ; Fissel, Ben ; Jones, Darin ; McCarthy, Abigail ; ... More +

Dorn, Martin ; Aydin, Kerim ; Fissel, Ben ; Jones, Darin ; McCarthy, Abigail ; Palsson, Wayne ; Spalinger, Kally Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service)
Description:

The base model projection of female spawning biomass in 2018 is 342,683 t, which is 57.5% of unfished spawning biomass (based on average post-1977 recruitment) and above B40% (238,000 t), thereby placing GOA pollock in sub-tier “a” of Tier 3. The new survey data for 2017 included the Shelikof Strait acoustic survey, the NMFS bottom trawl, summer acoustic survey, and the ADFG bottom trawl survey. Survey data in 2017 are highly contrasting, with both acoustic surveys indicating large or increasing biomass, and both bottom trawl surveys indicating a steep decline. These divergent trends are likely due to changes in the availability of pollock to different surveying methods, although additional research is need to confirm this hypothesis. Other characteristics of the GOA pollock stock are showing unusual patterns, including changes in growth and maturation, very low recruitment, and unequal sex ratios. Although the GOA pollock stock is currently estimated to be at relatively high abundance due to an exceptionally strong 2012 year class, it is apparent that we have entered into a period of increased uncertainty regarding future abundance trends.
Keywords:

[+]

Fish Stock Assessment Groundfish Walleye Pollock
Series:

Gulf of Alaska Stock Assessments
Document Type:

Stock Assessment
Place as Subject:

Alaska, Gulf of
Rights Information:

Public Domain
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Submitted
Main Document Checksum:

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urn:sha256:087ddb867fb05a11284b91f1635652c7d19c0acfebd78706b559d2d1e4e62872
Download URL:

https://repository.library.noaa.gov/view/noaa/17517/noaa_17517_DS1.pdf
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Assessment of the walleye pollock stock in the Gulf of Alaska

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