Scup, Stenotomus chrysops
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Eric Robillard (ER) has been working with Scup as the primary reader since 2025 and as the second age reader since 2012. Prior to that, the Scup age reader was Nicole Calabrese (NC, 2013-2025) and Daphne Cassidy (DC, <2013). 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.
| Sample Source | Test Type | Date Completed | Age Reader | Number Aged | Number Tested | CV (%) | Agreement (%) | Bias |
|---|---|---|---|---|---|---|---|---|
| 2024 Commercial Samples (Q4) | Precision | 3/2025 | ER | 304 | 58 | 1.34 | 87.9 | n/s |
| 2024 Commercial Samples (Q2) | Precision | 3/2025 | ER | 448 | 80 | 3.08 | 75.6 | n/s |
| 2024 Autumn Survey (202404) | Precision | 3/2025 | ER vs. NC | — | 61 | 4.61 | 70.5 | n/s |
| 2024 Commercial Samples (Q3) | Precision | 2/2025 | ER | 493 | 68 | 3.79 | 75.0 | n/s |
| 2024 Autumn Survey (202404) | Precision | 2/2025 | NC | 431 | 61 | 1.49 | 83.6 | n/s |
| 2024 Spring Survey (202402) | Precision | 11/2024 | NC | 244 | 44 | 1.91 | 84.1 | n/s |
| 2024 Commercial Samples (Q1) | Precision | 9/2024 | NC | 441 | 93 | 1.11 | 87.1 | n/s |
| 2023 Commercial Samples (Q4) | Precision | 4/2024 | NC | 215 | 45 | 0.00 | 100.0 | |
| 2023 Autumn Survey (202304) | Precision | 3/2024 | NC | 572 | 88 | 2.56 | 89.8 | n/s |
| 2023 Commercial Samples (Q3) | Precision | 1/2024 | NC | 251 | 55 | 1.53 | 75.5 | n/s |
| 2023 Commercial Samples (Q2) | Precision | 10/2023 | NC | 773 | 100 | 1.09 | 91.0 | |
| 2023 Commercial Samples (Q1) | Precision | 7/2023 | NC | 349 | 69 | 1.35 | 88.4 | n/s |
| 2022 Autumn Survey (202204) | Precision | 3/2023 | ER | 1012 | 100 | 2.94 | 82.0 | 0.004 |
| 2022 Commercial Samples (Q4) | Precision | 4/2023 | NC | 272 | 52 | 1.87 | 84.6 | n/s |
| 2022 Commercial Samples (Q3) | Precision | 3/2023 | NC | 563 | 100 | 1.05 | 91.0 | |
| 2022 Spring Survey (202202) | Precision | 2/2023 | NC | 233 | 53 | 2.71 | 84.9 | n/s |
| 2022 Commercial Samples (Q2) | Precision | 1/2023 | NC | 357 | 78 | 1.42 | 87.2 | n/s |
| 2022 Commercial Samples (Q1) | Precision | 12/2022 | NC | 389 | 80 | 1.17 | 90.0 | |
| 2021 Commercial Samples (Q4) | Precision | 10/2022 | NC | 431 | 82 | 1.37 | 87.8 | n/s |
| 2021 Autumn Survey (202104) | Precision | 8/2022 | NC | 735 | 100 | 1.43 | 89.0 | n/s |
| 2021 Commercial Samples (Q3) | Precision | 5/2022 | NC | 321 | 70 | 1.73 | 85.7 | n/s |
| 2021 Commercial Samples (Q2) | Precision | 4/2022 | NC | 433 | 81 | 1.22 | 88.9 | n/s |
| 2021 Spring Survey (202102) | Precision | 1/2022 | NC | 158 | 41 | 1.94 | 85.4 | n/s |
| 2021 Commercial Samples (Q1) | Precision | 12/2021 | NC | 962 | 100 | 1.57 | 88.0 | n/s |
| 2020 Spring Survey (202002) | Precision | 6/2021 | NC | 191 | 40 | 3.31 | 87.5 | n/s |
| 2020 Commercial Samples (Q4) | Precision | 6/2021 | NC | 442 | 87 | 1.05 | 89.7 | n/s |
| 2020 Commercial Samples (Q3) | Precision | 4/2021 | NC | 828 | 100 | 1.20 | 88.0 | n/s |
| 2020 Commercial Samples (Q2) | Precision | 1/2021 | NC | 740 | 100 | 0.86 | 91.0 | |
| 2020 Commercial Samples (Q1) | Precision | 10/2020 | NC | 745 | 100 | 1.20 | 87.0 | n/s |
| 2019 Commercial Samples (Q4) | Precision | 5/2020 | ER | 435 | 80 | 1.97 | 82.5 | n/s |
| 2019 Commercial Samples (Q3) | Precision | 5/2020 | ER | 646 | 100 | 1.59 | 87.0 | n/s |
| 2019 Commercial Samples (Q2) | Precision | 3/2020 | NC | 553 | 100 | 1.17 | 90.0 | |
| 2019 Commercial Samples (Q1) | Precision | 12/2019 | NC | 1125 | 100 | 2.09 | 81.0 | 0.038 |
| 2019 Spring Survey (201902) | Precision | 8/2019 | NC | 193 | 47 | 3.47 | 78.7 | n/s |
| 2018 Autumn Survey (201804) | Precision | 7/2019 | NC | 573 | 90 | 9.67 | 74.4 | n/s |
| 2018 Spring Survey (201802) | Precision | 7/2019 | NC | 168 | 34 | 7.27 | 76.5 | n/s |
| 2018 Commercial Samples (Q3) | Precision | 6/2019 | NC | 611 | 100 | 6.08 | 66.0 | 0.0003 |
| 2018 Commercial Samples (Q2) | Precision | 6/2019 | NC | 543 | 100 | 4.22 | 69.0 | n/s |
| 2018 Commercial Samples (Q1) | Precision | 6/2019 | NC | 628 | 95 | 3.59 | 71.6 | n/s |
| 2018 Commercial Samples (Q4) | Precision | 5/2019 | ER | 432 | 97 | 2.49 | 83.5 | 0.014 |
| 2017 Spring Survey (201702) | Precision | 12/2018 | NC | 254 | 50 | 5.03 | 82.0 | n/s |
| 2017 Commercial Samples (Q3) | Precision | 8/2018 | NC | 723 | 100 | 4.64 | 72.0 | n/s |
| 2017 Commercial Samples (Q1) | Precision | 8/2018 | NC | 633 | 76 | 4.05 | 72.4 | n/s |
| 2017 Commercial Samples (Q4) | Precision | 7/2018 | NC | 333 | 90 | 4.37 | 74.4 | n/s |
| 2017 Commercial Samples (Q2) | Precision | 7/2018 | NC | 482 | 100 | 3.13 | 79.0 | n/s |
| 2015 Commercial Samples (Q1) | Precision | 5/2016 | NC | 1055 | 94 | 2.39 | 80.8 | n/s |
| 2015 Autumn Survey (201504) | Precision | 4/2016 | ER | 392 | 75 | 2.36 | 96.0 | |
| 2014 Commercial Samples (Q4) | Precision | 4/2015 | NC | 893 | 77 | 1.69 | 88.3 | n/s |
| 2014 Commercial Samples (Q3) | Precision | 4/2015 | NC | 408 | 86 | 5.02 | 68.6 | n/s |
| 2014 Autumn Survey (201404) | Precision | 2/2015 | NC vs. DC | 366 | 59 | 1.57 | 89.8 | n/s |
| 2013 Autumn Survey (201304) | Precision | 4/2014 | DC | 251 | 50 | 0.26 | 98.0 | |
| 2013 Spring Survey (201302) | Precision | 4/2014 | DC | 177 | 39 | 0.40 | 97.4 | |
| 2013 Commercial Samples (Q1-4) | Precision | 3/2014 | DC | 2773 | 98 | 1.53 | 87.8 | n/s |
| 2012 Commercial Samples (Q1-4) | Precision | 5/2013 | DC | 2437 | 98 | 2.42 | 85.7 | n/s |
| 2012 Autumn Survey (201204) | Precision | 4/2013 | DC | 453 | 79 | 4.05 | 88.6 | n/s |
| 2012 Spring Survey (201202) | Precision | 2/2013 | DC | 180 | 47 | 0.33 | 97.9 | |
| 2011 Commercial Samples (Q3 & Q4) | Precision | 6/2012 | DC | 920 | 99 | 1.10 | 92.9 | |
| 2011 Commercial Samples (Q1 & Q2) | Precision | 6/2012 | DC | 1254 | 99 | 1.93 | 86.9 | n/s |
| 2011 Autumn Survey (201105) | Precision | 5/2012 | DC | 654 | 99 | 4.25 | 90.9 | |
| 2011 Spring Survey (201102) | Precision | 6/2011 | DC | 150 | 49 | 2.47 | 87.8 | n/s |
| 2010 Commercial Samples (Q3 & Q4) | Precision | 4/2011 | DC | 1004 | 99 | 2.61 | 83.8 | n/s |
| 2010 Commercial Samples (Q2) | Precision | 3/2011 | DC | 746 | 99 | 2.18 | 83.8 | n/s |
| 2010 Commercial Samples (Q1) | Precision | 3/2011 | DC | 668 | 95 | 1.20 | 92.6 | |
| 2010 Autumn Survey (201004) | Precision | 3/2011 | DC | 705 | 99 | 2.48 | 91.9 | |
| 2010 Massachusetts Spring Survey (201091) | Precision | 11/2010 | DC | 204 | 49 | 0.81 | 93.9 | |
| 2009 Commercial Samples (Q4) | Precision | 6/2010 | DC | 586 | 21 | 5.58 | 52.4 | 0.019 |
| 2009 Commercial Samples (Q3) | Precision | 6/2010 | DC | 364 | 24 | 0.00 | 100.0 | |
| 2009 Commercial Samples (Q2) | Precision | 6/2010 | DC | 559 | 24 | 3.37 | 62.5 | n/s |
| 2009 Commercial Samples (Q1) | Precision | 6/2010 | DC | 1626 | 46 | 0.00 | 100.0 | |
| 2009 Autumn Survey (200904) | Precision | 4/2010 | DC | 519 | 49 | 0.58 | 98.0 | n/s |
| 2009 Spring Survey (200902) | Precision | 4/2010 | DC | 63 | 24 | 4.58 | 87.5 | n/s |
| 2008 Commercial Samples (Q4) | Precision | 5/2009 | DC | 716 | 93 | 2.19 | 89.2 | n/s |
| 2008 Commercial Samples (Q3) | Precision | 4/2009 | DC | 660 | 73 | 7.53 | 65.8 | n/s |
| 2008 Commercial Samples (Q2) | Precision | 3/2009 | DC | 1064 | 97 | 3.19 | 76.3 | 0.030 |
| 2008 Commercial Samples (Q1) | Precision | 3/2009 | DC | 814 | 75 | 5.34 | 68.0 | 0.015 |
| 2008 Autumn Survey (200807) | Precision | 2/2009 | DC | 398 | 74 | 8.41 | 89.2 | n/s |
| 2008 Spring Survey (200803) | Precision | 2/2009 | DC | 91 | 49 | 3.42 | 81.6 | n/s |
