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2014 Pollock Operational Assessment Overview

2014 Pollock Operational Assessment Overview. Assessment Oversight Panel Meeting July 21, 2014. Data Inputs. First year: 1970 Last year: 2013 SARC 50 assessment used data through 2009 First age: 1 Last age: 9+ Number of fleets: 2 Commercial and recreational Number of surveys: 2

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2014 Pollock Operational Assessment Overview

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  1. 2014 Pollock Operational AssessmentOverview Assessment Oversight Panel Meeting July 21, 2014

  2. Data Inputs • First year: 1970 • Last year: 2013 • SARC 50 assessment used data through 2009 • First age: 1 • Last age: 9+ • Number of fleets: 2 • Commercial and recreational • Number of surveys: 2 • NMFS spring and fall bottom trawl surveys

  3. Data Inputs (continued) • Commercial landings • Numbers at age • Total weight • Commercial discards • Numbers at age • Total weight • Recreational landings • Numbers at age • Total weight • Recreational discards • Numbers at age • Total weight • NMFS spring bottom trawl survey • Total index values • Age-specific index values • NMFS fall bottom trawl survey • Total index values • Age-specific index values • Mean weight at age • Start of year • Mid-year • Natural mortality (not updated) • Maturity (not updated)

  4. Data Issues • MRIP recreational catch estimates used for 2004-2013 and1981-2003 MRFSS estimates converted to MRIP equivalents • In SARC 50, 2001-2008 fall commercial discard ALKs only included commercial data (i.e., no fall survey data) • Reestimated 2001-2008 commercial discards at age • Problems reproducing method used to obtain recreational discard CVs from SARC 50 • Currently using 1981-2009 average CV for 2010-2013

  5. Assessment Approach • Assessment model: ASAP v3.0.17 • Dome-shaped survey selectivity patterns • Commercial fleet selectivity time blocks: 4 • Recreational fleet selectivity time blocks: 3 • Sensitivity run with flat-topped survey selectivity patterns • Projection model: AgePro v4.2.2 • F40% • 75% of F40% • Status quo

  6. Assessment Approach (continued) • Alternative approach: AIM (An Index Method)

  7. The end

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