Witch Flounder, Glyptocephalus cynoglossus
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Sarah Emery (SE) has been working with Witch Flounder since 2010. Sectioned otoliths are aged 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 Com-pleted | Age Reader | Number Aged | Number Tested | CV (%) | Agree-ment (%) | Bias |
|---|---|---|---|---|---|---|---|---|
| 2024 Commercial Samples (Q2) | Precision | 10/2024 | SE | 554 | 63 | 1.48 | 82.5 | n/s |
| 2024 Commercial Samples (Q1) | Precision | 8/2024 | SE | 278 | 49 | 2.03 | 81.6 | n/s |
| 2024 Spring Survey (202402) | Precision | 7/2024 | SE | 728 | 76 | 1.87 | 82.9 | n/s |
| 2023 Commercial Samples (Q4) | Precision | 3/2024 | SE | 136 | 39 | 1.46 | 84.6 | n/s |
| 2023 Commercial Samples (Q3) | Precision | 3/2024 | SE | 138 | 46 | 1.13 | 87.0 | n/s |
| 2023 Autumn Survey (202304) | Precision | 1/2024 | SE | 473 | 79 | 1.98 | 86.1 | n/s |
| 2023 Commercial Samples (Q1) | Precision | 6/2023 | SE | 128 | 44 | 1.30 | 81.8 | n/s |
| 2019 Observer Samples (Q1-Q4) | Precision | 5/2023 | SE | 417 | 79 | 1.40 | 84.8 | n/s |
| 2022 Commercial Samples (Q3-Q4) | Precision | 3/2023 | SE | 131 | 41 | 0.69 | 90.2 | |
| 2022 Autumn Survey (202204) | Precision | 1/2023 | SE | 334 | 66 | 1.91 | 89.4 | n/s |
| 2022 Commercial Samples (Q1-2) | Precision | 9/2022 | SE | 145 | 42 | 0.70 | 90.5 | |
| 2022 Spring Survey (202202) | Precision | 7/2022 | SE | 465 | 80 | 1.76 | 87.5 | n/s |
| 2021 Autumn Survey (202104) | Precision | 2/2022 | SE | 534 | 68 | 1.68 | 86.8 | n/s |
| 2021 Commercial Samples (Q1-2) | Precision | 1/2022 | SE | 189 | 63 | 1.17 | 85.7 | n/s |
| 2021 Spring Survey (202102) | Precision | 9/2021 | SE | 510 | 51 | 2.76 | 86.3 | n/s |
| 2020 Commercial Samples (Q4) | Precision | 5/2021 | SE | 177 | 46 | 0.89 | 89.1 | n/s |
| 2020 Commercial Samples (Q3) | Precision | 4/2021 | SE | 142 | 38 | 1.24 | 86.8 | n/s |
| 2020 Commercial Samples (Q2) | Precision | 12/2020 | SE | 136 | 45 | 1.27 | 84.4 | n/s |
| 2020 Commercial Samples (Q1) | Precision | 8/2020 | SE | 194 | 46 | 1.27 | 82.6 | n/s |
| 2019 Commercial Samples (Q4) | Precision | 4/2020 | SE | 182 | 48 | 1.60 | 85.4 | n/s |
| 2019 Commercial Samples (Q3) | Precision | 4/2020 | SE | 190 | 57 | 1.42 | 84.2 | n/s |
| 2019 Autumn Survey (201904) | Precision | 1/2020 | SE | 498 | 98 | 0.93 | 92.9 | |
| 2019 Commercial Samples (Q2) | Precision | 10/2019 | SE | 142 | 42 | 0.68 | 90.5 | |
| 2019 Commercial Samples (Q1) | Precision | 10/2019 | SE | 251 | 58 | 2.14 | 79.3 | n/s |
| 2019 Spring Survey (201902) | Precision | 7/2019 | SE | 500 | 97 | 2.55 | 85.6 | n/s |
| 2018 Commercial Samples (Q4) | Precision | 6/2019 | SE | 199 | 49 | 2.37 | 79.6 | n/s |
| 2018 Commercial Samples (Q3) | Precision | 3/2019 | SE | 217 | 51 | 1.51 | 82.4 | n/s |
| 2018 Autumn Survey (201804) | Precision | 3/2019 | SE | 339 | 75 | 2.38 | 88.0 | n/s |
| 2018 Commercial Samples (Q2) | Precision | 2/2019 | SE | 225 | 54 | 1.29 | 83.3 | n/s |
| 2018 Commercial Samples (Q1) | Precision | 9/2018 | SE | 247 | 57 | 1.05 | 87.7 | n/s |
| 2018 Spring Survey (201802) | Precision | 6/2018 | SE | 290 | 64 | 1.60 | 87.5 | n/s |
| 2017 Commercial Samples (Q4) | Precision | 5/2018 | SE | 195 | 45 | 1.44 | 84.4 | n/s |
| 2017 Commercial Samples (Q3) | Precision | 4/2018 | SE | 249 | 57 | 1.01 | 87.7 | n/s |
| 2017 Autumn Survey (201704) | Precision | 1/2018 | SE | 512 | 100 | 1.40 | 89.0 | n/s |
| 2017 Commercial Samples (Q2) | Precision | 12/2017 | SE | 256 | 58 | 0.86 | 89.7 | n/s |
| 2017 Commercial Samples (Q1) | Precision | 8/2017 | SE | 209 | 45 | 0.87 | 88.9 | n/s |
| 2017 Spring Survey (201702) | Precision | 7/2017 | SE | 387 | 74 | 1.31 | 89.2 | n/s |
| 2016 Commercial Samples (Q4) | Precision | 5/2017 | SE | 230 | 54 | 0.95 | 87.0 | n/s |
| 2016 Commercial Samples (Q3) | Precision | 3/2017 | SE | 151 | 40 | 1.55 | 80.0 | n/s |
| 2016 Autumn Survey (201604) | Precision | 1/2017 | SE | 515 | 96 | 1.55 | 88.5 | n/s |
| 2016 Commercial Samples (Q2) | Precision | 10/2016 | SE | 242 | 56 | 1.05 | 87.5 | n/s |
| 2016 Commercial Samples (Q1) | Precision | 9/2016 | SE | 501 | 97 | 1.24 | 83.5 | n/s |
| 2016 Spring Survey (201602) | Precision | 7/2016 | SE | 555 | 93 | 1.28 | 92.5 | |
| 2015 Commercial Samples (Q4) | Precision | 4/2016 | SE | 376 | 76 | 1.38 | 84.2 | n/s |
| 2015 Commercial Samples (Q3) | Precision | 3/2016 | SE | 354 | 74 | 1.42 | 85.1 | n/s |
| 2015 Autumn Survey (201504) | Precision | 2/2016 | SE | 562 | 97 | 1.18 | 93.8 | |
| 2015 Commercial Samples (Q2) | Precision | 11/2015 | SE | 481 | 90 | 1.06 | 88.9 | n/s |
| 2015 Commercial Samples (Q1) | Precision | 10/2015 | SE | 471 | 92 | 1.03 | 85.9 | n/s |
| 2015 Spring Survey (201502) | Precision | 7/2015 | SE | 635 | 91 | 1.37 | 93.4 | |
| 2014 Commercial Samples (Q4) | Precision | 6/2015 | SE | 312 | 64 | 1.85 | 82.8 | n/s |
| 2014 Commercial Samples (Q3) | Precision | 4/2015 | SE | 224 | 53 | 1.35 | 84.9 | n/s |
| 2014 Commercial Samples (Q2) | Precision | 4/2015 | SE | 468 | 91 | 0.94 | 89.0 | n/s |
| 2014 Autumn Survey (201404) | Precision | 2/2015 | SE | 479 | 91 | 0.92 | 93.4 | |
| 2014 Commercial Samples (Q1) | Precision | 1/2015 | SE | 641 | 97 | 0.83 | 88.7 | n/s |
| 2014 Spring Survey (201402) | Precision | 10/2014 | SE | 618 | 94 | 1.38 | 93.6 | |
| 2013 Commercial Samples (Q4) | Precision | 9/2014 | SE | 376 | 80 | 0.45 | 93.8 | |
| 2013 Commercial Samples (Q3) | Precision | 8/2014 | SE | 560 | 99 | 1.15 | 89.9 | n/s |
| 2013 Commercial Samples (Q2) | Precision | 8/2014 | SE | 518 | 99 | 0.27 | 97.0 | |
| 2013 Commercial Samples (Q1) | Precision | 6/2014 | SE | 399 | 79 | 0.72 | 91.1 | |
| 2013 Autumn Survey (201304) | Precision | 6/2014 | SE | 381 | 78 | 1.02 | 92.3 | |
| 2013 Spring Survey (201302) | Precision | 5/2014 | SE | 261 | 58 | 1.65 | 89.7 | n/s |
| 2012 Commercial Samples (Q4) | Precision | 3/2014 | SE | 395 | 80 | 0.91 | 92.5 | |
| 2012 Commercial Samples (Q3) | Precision | 1/2014 | SE | 315 | 68 | 0.82 | 91.2 | |
| 2012 Commercial Samples (Q2) | Precision | 11/2013 | SE | 302 | 65 | 0.71 | 90.8 | |
| 2012 Commercial Samples (Q1) | Precision | 9/2013 | SE | 386 | 79 | 1.53 | 83.5 | n/s |
| 2012 Autumn Survey (201204) | Precision | 7/2013 | SE | 473 | 99 | 2.07 | 84.8 | n/s |
| 2012 Spring Survey (201202) | Precision | 2/2013 | SE | 453 | 96 | 1.42 | 88.5 | n/s |
| 2011 Commercial Samples (Q4) | Precision | 11/2012 | SE | 344 | 90 | 1.28 | 85.6 | n/s |
| 2011 Commercial Samples (Q3) | Precision | 9/2012 | SE | 184 | 50 | 0.95 | 90.0 | |
| 2011 Commercial Samples (Q2) | Precision | 8/2012 | SE | 344 | 98 | 1.47 | 81.6 | n/s |
| 2011 Autumn Survey (201105) | Precision | 6/2012 | SE | 470 | 94 | 1.57 | 88.3 | n/s |
| 2011 Commercial Samples (Q1) | Precision | 4/2012 | SE | 297 | 79 | 1.72 | 77.2 | n/s |
| 2010 Commercial Samples (Q1-Q4) | Precision | 2/2012 | SE | 1124 | 94 | 2.03 | 75.5 | n/s |
| 2009 Commercial Samples (Q1-Q4) | Precision | 2/2012 | SE | 947 | 100 | 1.44 | 83.0 | n/s |
| 2011 Spring Survey (201102) | Precision | 1/2012 | SE | 440 | 95 | 2.02 | 85.3 | n/s |
| 2008 Commercial Samples (Q3 & Q4) | Precision | 9/2011 | SE | 525 | 72 | 1.86 | 77.8 | n/s |
| 2008 Commercial Samples (Q2) | Precision | 8/2011 | SE | 472 | 96 | 1.59 | 83.3 | n/s |
| 2008 Commercial Samples (Q1) | Precision | 8/2011 | SE | 411 | 95 | 2.07 | 75.8 | n/s |
| 2010 Autumn Survey (201004) | Precision | 7/2011 | SE | 435 | 98 | 1.27 | 89.8 | n/s |
| 2010 Spring Survey (201001) | Precision | 6/2011 | SE | 581 | 97 | 2.14 | 84.5 | n/s |
| 2009 Autumn Survey (200904) | Precision | 12/2010 | SE | 433 | 100 | 2.64 | 87.0 | n/s |
| 2009 Spring Survey (200902) | Precision | 12/2010 | SE vs. JB | 698 | 251 | 1.21 | 89.2 | n/s |
| 2007 Commercial Samples (Q4) | Precision | 8/2008 | JB | 342 | 51 | 1.92 | 78.4 | n/s |
| 2007 Commercial Samples (Q3) | Precision | 8/2008 | JB | 483 | 50 | 1.60 | 80.0 | n/s |
| 2007 Commercial Samples (Q2) | Precision | 8/2008 | JB | 355 | 50 | 1.25 | 84.0 | n/s |
| 2007 Autumn Survey (200709) | Precision | 7/2008 | JB | 145 | 71 | 1.35 | 91.5 | |
| 2008 Spring Survey (200803) | Precision | 6/2008 | JB | 245 | 76 | 1.45 | 88.2 | n/s |
| 2007 Commercial Samples (Q1) | Precision | 11/2007 | JB | 529 | 86 | 1.68 | 77.9 | n/s |
| 2006 Commercial Samples (Q4) | Precision | 10/2007 | JB | 406 | 63 | 1.04 | 85.7 | n/s |
| 2006 Commercial Samples (Q3) | Precision | 10/2007 | JB | 486 | 59 | 1.43 | 83.1 | n/s |
| 2006 Commercial Samples (Q2) | Precision | 10/2007 | JB | 356 | 59 | 1.13 | 84.7 | n/s |
| 2006 Commercial Samples (Q1) | Precision | 10/2007 | JB | 438 | 62 | 1.03 | 83.9 | n/s |
| 2005 Commercial Samples (Q4) | Precision | 10/2007 | JB | 394 | 58 | 1.28 | 82.8 | n/s |
| 2005 Commercial Samples (Q3) | Precision | 10/2007 | JB | 387 | 52 | 0.96 | 86.5 | n/s |
| 2005 Commercial Samples (Q2) | Precision | 10/2007 | JB | 339 | 56 | 1.06 | 83.9 | n/s |
| 2005 Commercial Samples (Q1) | Precision | 10/2007 | JB | 231 | 47 | 0.95 | 87.2 | n/s |
| 2007 Spring Survey (200703) | Precision | 7/2007 | JB | 182 | 75 | 1.82 | 86.7 | n/s |
| 2006 Autumn Survey (200610) | Precision | 3/2007 | JB | 168 | 65 | 1.21 | 92.3 | |
| 2006 Spring Survey (200604) | Precision | 3/2007 | JB | 223 | 102 | 1.25 | 90.2 | |
| 2005 Spring Survey (200503) | Calibration | 2/2007 | JB | — | 76 | 2.08 | 80.3 | n/s |
| 2004 Commercial Samples (Q2 & Q4) and 2005 Spring Survey (200503) | Precision | 8/2005 | JB | 708 | 122 | 1.55 | 80.3 | n/s |
