Winter Flounder, Pseudopleuronectes americanus
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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 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. 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 | Stock | Age Struc-ture | Test Type | Date Com-pleted | Age Reader | Number Aged | Number Tested | CV (%) | Agree-ment (%) | Bias |
|---|---|---|---|---|---|---|---|---|---|---|
| 2023 Autumn Survey (202304) | Otoliths | Precision | 2/2024 | ER | 581 | 76 | 1.04 | 89.5 | n/s | |
| 2023 Spring Survey (202302) | Otoliths | Precision | 10/2023 | ER | 298 | 58 | 1.38 | 89.7 | n/s | |
| 2023 Commercial Samples (Q1) | Otoliths | Precision | 9/2023 | ER | 114 | 40 | 1.67 | 85.0 | n/s | |
| 2022 Autumn Survey (202204) | Otoliths | Precision | 2/2023 | ER | 813 | 100 | 1.21 | 91.0 | ||
| 2022 Spring Survey (202202) | Otoliths | Precision | 9/2022 | ER | 695 | 100 | 1.77 | 89.0 | n/s | |
| 2021 Autumn Survey (202104) | Otoliths | Precision | 6/2022 | ER | 600 | 99 | 2.32 | 85.9 | n/s | |
| 2021 Spring Survey (202102) | Otoliths | Precision | 5/2022 | ER | 854 | 97 | 1.99 | 82.5 | n/s | |
| 2020 Commercial Samples (Q1-4) | Otoliths | Precision | 7/2021 | ER | 327 | 68 | 2.34 | 82.4 | n/s | |
| 2019 Autumn Survey (201904) | Otoliths | Precision | 2/2020 | ER | 575 | 100 | 0.52 | 95.0 | ||
| 2019 Commercial Samples (Q3) | Otoliths | Precision | 2/2020 | ER | 169 | 40 | 0.00 | 100.0 | ||
| 2019 Commercial Samples (Q2) | Otoliths | Precision | 12/2019 | ER | 175 | 46 | 0.52 | 95.7 | ||
| 2019 Spring Survey (201902) | Otoliths | Precision | 8/2019 | 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 |
