Atlantic Herring, Clupea harengus
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Katie Rogers (KR) has been working with Atlantic Herring since 2016; before that, the age reader was Blanche Jackson (BJ, retired). Whole otoliths are mounted in clear resin and 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 |
|---|---|---|---|---|---|---|---|---|
| 2025 Autumn Survey (202504) | Precision | 2/2026 | KR | 196 | 40 | 0.51 | 95.0 | |
| 2025 Spring Survey (202502) | Precision | 2/2026 | KR | 296 | 60 | 0.79 | 93.3 | |
| 2024 Autumn Survey (202404) | Precision | 4/2025 | KR | 444 | 56 | 0.80 | 92.7 | |
| 2024 Spring Survey (202402) | Precision | 2/2025 | KR | 560 | 75 | 1.51 | 88.0 | n/s |
| 2023 Autumn Survey (202304) | Precision | 2/2024 | KR | 341 | 71 | 1.12 | 93.0 | |
| 2023 Spring Survey (202302) | Precision | 1/2024 | KR | 122 | 40 | 1.33 | 90.0 | |
| 2021 & 2022 multiple Surveys (202102, 202104, 202170, 202192, 202202, 202204, 202270) | Precision | 1/2024 | KR | 949 | 100 | 0.52 | 96.0 | |
| 2022 Summer Shrimp Survey (202270) | Precision | 6/2023 | KR | 122 | 40 | 0.44 | 95.0 | |
| 2022 Autumn Survey (202204) | Precision | 6/2023 | KR | 287 | 60 | 1.16 | 90.0 | |
| 2022 Spring Survey (202202) | Precision | 11/2022 | KR | 420 | 80 | 0.91 | 92.5 | |
| 2021 Autumn Survey (202104) | Precision | 5/2022 | KR | 285 | 53 | 1.28 | 92.5 | |
| 2021 Spring Survey (202102) | Precision | 5/2022 | KR | 482 | 100 | 0.24 | 97.0 | |
| 2019 Autumn Survey (201904) | Precision | 1/2020 | KR | 443 | 90 | 1.79 | 84.4 | n/s |
| 2019 Spring Survey (201902) | Precision | 10/2019 | KR | 606 | 100 | 0.77 | 92.0 | |
| 2018 Autumn Survey (201804) | Precision | 4/2019 | KR | 270 | 59 | 0.81 | 91.5 | |
| 2018 Spring Survey (201802) | Precision | 7/2018 | KR | 522 | 87 | 0.91 | 90.8 | |
| 2017 Commercial Samples (Q1 & 4) | Exchange | Spring 2018 | KR vs. DK | — | 154 | 1.24 | 90.9 | |
| 2017 Autumn Survey (201704) | Precision | 2/2018 | KR | 406 | 85 | 0.80 | 94.1 | |
| 2017 Spring Survey (201702) | Precision | 12/2017 | KR | 1020 | 102 | 0.56 | 95.1 | |
| 2016 Autumn Survey (201604) | Precision | 3/2017 | KR | 662 | 93 | 1.25 | 90.3 | |
| 2016 Spring Survey (201602) | Precision | 12/2016 | KR vs. BJ | 793 | 95 | 2.31 | 84.2 | n/s |
| 2016 Spring Survey (201602) | Precision | 11/2016 | BJ | 793 | 95 | 0.68 | 95.8 | |
| 2015 Autumn Survey (201504) | Precision | 5/2016 | BJ | 941 | 96 | 0.33 | 97.9 | |
| 2015 Spring Survey (201502) | Precision | 1/2016 | BJ | 839 | 100 | 0.00 | 100.0 | |
| 2014 Autumn Survey (201404) | Precision | 4/2015 | BJ | 828 | 98 | 0.24 | 98.0 | |
| 2014 Spring Survey (201402) | Precision | 1/2015 | BJ | 1152 | 98 | 1.00 | 92.9 | |
| 2013 Autumn Survey (201304) | Precision | 10/2014 | BJ | 675 | 99 | 0.76 | 97.0 | |
| 2013 Spring Survey (201302) | Precision | 8/2014 | BJ | 1521 | 101 | 2.95 | 83.2 | 0.005 |
| 2012 Autumn Survey (201204) | Precision | 7/2014 | BJ | 704 | 98 | 1.57 | 90.8 | |
| 2012 Spring Survey (201202) | Precision | 6/2014 | BJ | 1154 | 99 | 0.98 | 91.9 | |
| 2012 Acoustic Survey (201206) | Precision | 6/2014 | BJ | 540 | 98 | 0.92 | 93.9 | |
| 2011 Autumn Survey (201105) | Precision | 8/2012 | BJ | 579 | 100 | 3.12 | 81.0 | n/s |
| 2011 Acoustic Survey (201106) | Precision | 6/2012 | BJ | 657 | 98 | 1.32 | 91.8 | |
| 2011 Spring Survey (201102) | Precision | 1/2012 | BJ | 1713 | 100 | 1.14 | 93.0 | |
| 2010 Autumn Survey (201004) | Precision | 12/2011 | BJ | 861 | 104 | 0.59 | 95.2 | |
| 2010 Spring Survey (201001) | Precision | 12/2010 | BJ | 1802 | 106 | 3.30 | 80.2 | 0.007 |
| 2009 Autumn Survey (200904) | Precision | 6/2010 | BJ | 895 | 115 | 0.92 | 93.0 | |
| 2009 Acoustic Survey (200905) | Precision | 5/2010 | BJ | 387 | 112 | 1.72 | 90.2 | |
| 2009 Spring Survey (200902) | Precision | 4/2010 | BJ | 1609 | 130 | 2.15 | 86.2 | n/s |
| 2008 Autumn Survey (200807) | Precision | 2/2009 | SE vs. BJ | 726 | 197 | 2.34 | 84.3 | n/s |
| 2008 Spring Survey (200803) | Precision | 2/2009 | SE vs. BJ | 801 | 210 | 3.09 | 79.5 | n/s |
| 2007 Autumn Survey (200709) | Precision | 1/2009 | SE vs. BJ | 938 | 255 | 1.93 | 86.7 | n/s |
| 2006 Autumn Survey (200610) | Precision | 1/2009 | SE vs. BJ | 623 | 173 | 2.54 | 80.3 | 0.020 |
| 2006 Spring Survey (200604) | Precision | 1/2009 | SE vs. BJ | 960 | 270 | 1.38 | 88.9 | n/s |
| 2006 Winter Survey (200603) | Precision | 1/2009 | SE vs. BJ | 318 | 285 | 0.99 | 91.6 | |
| 2008 Acoustic Survey (200813) | Precision | 1/2009 | SE vs. BJ | 494 | 139 | 3.46 | 76.3 | 0.017 |
| 2007 Acoustic Survey (200710) | Precision | 12/2008 | SE vs. BJ | 295 | 84 | 1.15 | 90.5 | |
| 2006 Acoustic Survey (200611) | Precision | 12/2008 | SE vs. BJ | 302 | 80 | 1.85 | 83.8 | n/s |
| 2005 Acoustic Survey (200511) | Precision | 12/2008 | SE vs. BJ | 371 | 107 | 3.20 | 78.5 | n/s |
| 2007 Spring Survey (200703) | Precision | 9/2007 | SE vs. BJ | 1039 | 1039 | 1.45 | 88.7 | n/s |
| 2007 Winter Survey (200702) | Precision | 7/2007 | SE vs. BJ | 448 | 451 | 1.92 | 85.4 | n/s |
| 2005 Autumn Survey (200510) | Precision | 3/2006 | BJ | 1055 | 103 | 3.22 | 72.8 | 0.011 |
| 2004-2005 Maine DMR Commercial Samples (Q1-4) | Precision | 2/2006 | BJ | — | 84 | 2.12 | 81.0 | n/s |
