Results of all QA/QC Exercises
for Winter Flounder, Pseudopleuronectes americanus

Pseudopleuronectes americanus


Eric Robillard (ER) has been working with Winter Flounder since 2015; before that, the age reader was Grace Thornton (GT). Catherine Fillo (CF) was briefly in training. Sectioned otoliths are viewed with transmitted light.

In tests where agreement is below 90%, bias indicates either the P-value of a Bowker’s test or ‘n/s’ (test not significant at the α = 0.05 level). Stock indicates whether samples were from Georges Bank (GB) or the Gulf of Maine (GOM); if no stock area is specified, samples were from both areas combined. Structure indicates which part of the fish was used: Scales, Otoliths, or a combination of both (S+O).

Sample Source StockAge StructureTest Type Date Completed Age Reader Number Aged Number Tested CV (%) Agreement (%) Bias
2019 Spring Survey (201902)   Otoliths Precision 8/2018 ER 507 99 3.86 78.8 0.031
2018 Commercial Samples (Q3)   Otoliths Precision 5/2019 ER 330 64 3.41 78.1 n/s
2018 Commercial Samples (Q2)   Otoliths Precision 3/2019 ER 569 100 1.57 86.0 n/s
2018 Autumn Survey (201804)   Otoliths Precision 2/2019 ER 594 100 2.31 91.0  
2018 Commercial Samples (Q1)   Otoliths Precision 10/2018 ER 299 66 3.08 77.3 n/s
2018 Spring Survey (201802)   Otoliths Precision 9/2018 CF 423 90 2.29 87.8 n/s
2018 Spring Survey (201802)   Otoliths Precision 9/2018 CF vs. ER 423 89 3.19 80.9 0.020
2018 Spring Survey (201802)   Otoliths Precision 8/2018 CF vs. ER -- 100 0.83 94.0  
2017 Spring Survey (201702)   Otoliths Precision 7/2018 ER 795 100 1.84 87.0 n/s
2017 Commercial Samples (Q4)   Otoliths Precision 5/2018 ER 460 89 1.91 86.5 n/s
2017 Commercial Samples (Q3)   Otoliths Precision 5/2018 ER 538 96 2.11 82.3 n/s
2017 Commercial Samples (Q2)   Otoliths Precision 5/2018 ER 814 101 2.79 79.2 n/s
2017 Commercial Samples (Q1)   Otoliths Precision 4/2018 ER 246 58 3.24 75.9 n/s
2016 Spring Survey (201602)   Otoliths Precision 10/2016 ER 902 96 1.92 87.5 n/s
2015 Autumn Survey (201504)   Otoliths Precision 4/2016 ER 552 96 2.08 84.4 n/s
2015 Commercial Samples (Q1-4)   Otoliths Precision 4/2016 ER 768 98 0.89 91.8  
2015 Spring Survey (201502)   Otoliths Precision 7/2015 ER 734 98 2.18 82.7 n/s
2014 Spring Survey (201402)   Otoliths Precision 4/2015 ER vs. GT -- 99 4.63 75.8 n/s
2014 Autumn Survey (201404)   Otoliths Precision 1/2015 GT 773 89 3.53 80.9 n/s
2014 Commercial Samples (Q2)   S+O Precision 11/2014 GT 1078 93 1.86 83.9 n/s
2014 Commercial Samples (Q1)   S+O Precision 9/2014 GT 391 78 3.85 69.2 n/s
2014 Spring Survey (201402)   Otoliths Precision 7/2014 GT 964 95 3.27 88.4 n/s
2013 Commercial Samples (Q3-4)   S+O Precision 2/2014 GT 946 95 3.09 79.0 n/s
2013 Autumn Survey (201304)   Otoliths Precision 1/2014 GT 654 84 7.68 78.6 n/s
2013 Commercial Samples (Q1-2)   S+O Precision 11/2013 GT 1121 97 3.56 72.2 n/s
2013 Spring Survey (201302)   Otoliths Precision 8/2013 GT 1138 98 4.80 76.5 n/s
2012 Commercial Samples (Q4)   S+O Precision 2/2013 GT 607 95 4.42 65.3 n/s
2012 Commercial Samples (Q1-3)   S+O Precision 1/2013 GT 1447 95 5.77 61.1 n/s
2012 Autumn Survey (201204)   Otoliths Precision 1/2013 GT 1078 99 7.52 66.7 0.007
2012 Spring Survey (201202)   Otoliths Precision 1/2013 GT 1209 99 5.20 73.7 n/s
2011 Spring Survey (201102)   Otoliths Precision 1/2013 GT 924 100 4.98 75.0 n/s
2011 Massachusetts Spring Survey (201191)   Otoliths Precision 11/2011 GT 512 91 4.38 75.8 n/s
2007 Autumn Survey (200709)   Otoliths Precision 6/2008 GT vs. JB 473 467 3.23 89.3 0.021
2007 Spring Survey (200703)   Otoliths Precision 8/2007 GT vs. JB 480 477 3.15 86.0 0.003
2004 Autumn Survey (200407) & 2005 Spring Survey (200503) SNE & GOM Otoliths Precision 8/2005 JB 580 110 1.59 93.6  
2004 Commercial Samples (Q1 & Q3)   Scales Precision 8/2005 JB 1475 115 2.81 79.1 n/s

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