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Pollock: QA/QC Exercise Results

Results of the QA/QC exercises for ageing pollock.

Pollock, Pollachius virens

Image
Side-profile of Atlantic pollock with dark back, white belly, and silvery lateral line across its side. Credit: NOAA Fisheries/Jack Hornady

Jillian Price (JP) has been working with Pollock since 2014; before that, the age reader was Bill Duffy (WD). Sectioned otoliths are viewed with reflected light.

In tests where agreement is below 90%, bias indicates either the P-value of a symmetry test or ‘n/s’ (test not significant at the α = 0.05 level). The Evans & Hoenig test was used to test bias starting 1/2022; prior to that, a Bowker's test was used.

Sample Source Test Type Date Completed Age Reader Number Aged Number Tested CV (%) Agree-ment (%) Bias
2022 Spring Survey (202202) Precision 9/2022 JP 136 41 0.00 100.0  
2021 Commercial Samples (Q1-4) Precision 4/2022 JP 187 40 0.66 95.0  
2021 Autumn Survey (202104) Precision 4/2022 JP 102 32 1.52 93.8  
2020 Commercial Samples (Q4) Precision 5/2021 JP 201 40 0.59 95.0  
2020 Commercial Samples (Q3) Precision 5/2021 JP 118 40 0.00 100.0  
2020 Commercial Samples (Q2) Precision 5/2021 JP 202 40 0.21 97.5  
2020 Commercial Samples (Q1) Precision 4/2021 JP 150 42 0.42 95.2  
2019 Commercial Samples (Q4) Precision 8/2020 JP 122 40 0.00 100.0  
2019 Commercial Samples (Q3) Precision 3/2020 JP 209 46 0.44 97.8  
2019 Commercial Samples (Q2) Precision 1/2020 JP 174 40 0.00 100.0  
2019 Commercial Samples (Q1) Precision 12/2019 JP 253 62 0.72 91.9  
2018 Commercial Samples (Q4) Precision 6/2019 JP 200 50 1.16 90.0  
2018 Commercial Samples (Q3) Precision 5/2019 JP 176 43 0.19 97.7  
2018 Commercial Samples (Q2) Precision 2/2019 JP 277 59 0.34 98.3  
2018 Commercial Samples (Q1) Precision 9/2018 JP 394 70 0.16 98.6  
2017 Commercial Samples (Q4) Precision 5/2018 JP 401 78 1.34 87.2 n/s
2017 Commercial Samples (Q3) Precision 4/2018 JP 681 99 0.00 100.0  
2017 Commercial Samples (Q2) Precision 3/2018 JP 568 101 0.13 98.0  
2017 Commercial Samples (Q1) Precision 3/2018 JP 631 96 0.61 92.7  
2017 Spring Survey (201702) Precision 8/2017 JP 171 44 0.00 100.0  
2016 Commercial Samples (Q4) Precision 4/2017 JP 427 80 0.00 100.0  
2016 Commercial Samples (Q3) Precision 4/2017 JP 684 93 0.22 98.9  
2016 Autumn Survey (201604) Precision 2/2017 JP 163 54 0.37 98.2  
2016 Commercial Samples (Q2) Precision 1/2017 JP 619 94 0.31 96.8  
2016 Commercial Samples (Q1) Precision 10/2016 JP 620 92 1.05 88.0 n/s
2016 Spring Survey (201602) Precision 9/2016 JP 391 78 0.14 98.7  
2015 Commercial Samples (Q4) Precision 4/2016 JP 745 101 0.19 98.0  
2015 Commercial Samples (Q3) Precision 4/2016 JP 693 104 1.06 89.4 n/s
2015 Autumn Survey (201504) Precision 3/2016 JP 270 58 0.00 100.0  
2015 Commercial Samples (Q2) Precision 1/2016 JP 682 99 0.51 92.9  
2015 Commercial Samples (Q1) Precision 12/2015 JP 724 96 1.05 88.5 n/s
2015 Spring Survey (201502) Precision 7/2015 JP 200 45 0.63 97.8  
2014 Commercial Samples (Q4) Precision 3/2015 JP 636 97 1.66 84.5 n/s
2014 Commercial Samples (Q3) Precision 3/2015 JP 549 99 2.96 79.8 0.011
2014 Autumn Survey (201404) Precision 3/2015 JP 234 51 0.00 100.0  
2014 Commercial Samples (Q2) Precision 12/2014 JP 604 97 2.17 79.4 n/s
2014 Commercial Samples (Q1) Precision 9/2014 JP 815 92 1.80 81.5 n/s
2013 Commercial Samples (Q1-4) Precision 8/2014 JP 93 1.69 81.9 n/s
2013 Commercial Samples (Q4) Precision 8/2014 JP vs. WD 147 2.49 79.6 n/s
2013 Commercial Samples (Q3) Precision 8/2014 JP vs. WD -— 148 2.95 72.3 n/s
2013 Commercial Samples (Q2) Precision 8/2014 JP vs. WD 148 3.44 68.9 n/s
2013 Commercial Samples (Q1) Precision 7/2014 JP vs. WD 109 3.84 62.4 n/s
2014 Spring Survey (201402) Precision 7/2014 JP 154 43 5.85 81.4 0.047
2013 Spring Survey (201302) Precision 7/2014 JP vs. WD 162 50 7.22 62.0 n/s
2013 Commercial Samples (Q4) Precision 3/2014 WD 629 99 1.85 84.9 n/s
2013 Commercial Samples (Q3) Precision 3/2014 WD 773 99 0.82 89.9 n/s
2013 Commercial Samples (Q2) Precision 2/2014 WD 569 100 1.68 79.0 0.025
2013 Commercial Samples (Q1) Precision 2/2014 WD 421 93 1.38 83.9 n/s
2012 Autumn Survey (201204) Precision 1/2014 WD 212 49 2.12 93.9  
2013 Spring Survey (201302) Precision 1/2014 WD 162 45 2.17 84.4 n/s
2012 Commercial Samples (Q4) Precision 10/2013 WD 575 95 1.10 88.4 n/s
2012 Commercial Samples (Q3) Precision 9/2013 WD 533 98 1.66 84.7 n/s
2012 Commercial Samples (Q2) Precision 8/2013 WD 512 98 1.71 81.6 n/s
2012 Commercial Samples (Q1) Precision 7/2013 WD 419 86 1.20 84.9 n/s
2011 Commercial Samples (Q4) Precision 6/2013 WD 485 97 1.80 81.4 n/s
2011 Commercial Samples (Q3) Precision 6/2013 WD 636 99 2.16 75.8 n/s
2011 Commercial Samples (Q2) Precision 4/2013 WD 570 95 1.43 84.2 n/s
2011 Commercial Samples (Q1) Precision 3/2013 WD 508 90 2.05 77.8 n/s
2011 Autumn Survey (201105) Precision 3/2013 WD 178 49 2.05 91.8  
2011 Spring Survey (201102) Precision 3/2013 WD 163 46 1.64 84.8 n/s
2010 Commercial Samples (Q4) Precision 10/2011 WD 633 105 3.28 70.5 n/s
2010 Commercial Samples (Q3) Precision 10/2011 WD 643 102 2.28 76.5 n/s
2010 Autumn Survey (201004) Precision 10/2011 WD 118 54 6.70 70.4 n/s
2010 Commercial Samples (Q2) Precision 7/2011 WD 486 98 2.44 77.6 n/s
2010 Commercial Samples (Q1) Precision 6/2011 WD 619 99 3.24 67.7 n/s
2010 Spring Survey (201001) Precision 1/2011 WD 118 60 2.59 85.0 n/s
2009 Spring Survey (200902) Precision 12/2010 WD 163 41 4.17 80.5 n/s
2009 Commercial Samples (Q1-4) Precision 4/2010 WD 1032 95 2.75 72.6 n/s
2008 Commercial Samples (Q1-4) Precision 4/2010 WD 1159 99 2.71 74.7 n/s
2007 Commercial Samples (Q4) Precision 3/2010 WD 534 99 3.80 66.7 n/s
2007 Commercial Samples (Q3) Precision 3/2010 WD 456 99 1.62 83.8 n/s
2007 Commercial Samples (Q2) Precision 3/2010 WD 296 80 2.21 77.5 n/s
2007 Commercial Samples (Q1) Precision 3/2010 WD 452 99 3.08 68.7 0.067
2006 Commercial Samples (Q4) Precision 3/2010 WD 545 100 3.03 69.0 n/s
2006 Commercial Samples (Q3) Precision 2/2010 WD 387 80 0.77 92.5  
2006 Commercial Samples (Q2) Precision 2/2010 WD 658 100 3.28 66.0 n/s
2006 Commercial Samples (Q1) Precision 2/2010 WD 395 80 3.74 62.5 n/s
2005 Commercial Samples (Q4) Precision 2/2010 WD 477 100 1.54 87.0 n/s
2005 Commercial Samples (Q3) Precision 2/2010 WD 536 100 3.07 73.0 n/s
2005 Commercial Samples (Q2) Precision 1/2010 WD 327 80 4.72 60.0 n/s
2005 Commercial Samples (Q1) Precision 1/2010 WD 256 70 4.29 65.7 n/s
2007 Spring Survey (200703) Precision 8/2007 WD 210 25 2.01 84.0 n/s
2006 Autumn Survey (200610) Precision 8/2007 WD 106 25 6.46 68.0 0.046

Last updated by Northeast Fisheries Science Center on January 05, 2023

Age and Growth