Atlantic Cod, Gadus morhua
Nina Shepherd (NS) has been working with Atlantic Cod since 2003. Baked and sectioned otoliths are 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. 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. All samples were collected by the Northeast Fisheries Science Center except where indicated otherwise.
Sample Source | Stock | Test Type | Date Completed | Age Reader | Number Aged | Number Tested | CV (%) | Agree-ment (%) | Bias |
---|---|---|---|---|---|---|---|---|---|
2024 Autumn Survey (202404) | Precision | 12/2024 | NS | 165 | 39 | 0.73 | 97.4 | ||
2024 Commercial Samples (Q2) | Precision | 10/2024 | NS | 533 | 65 | 0.31 | 98.5 | ||
2024 Commercial Samples (Q1) | Precision | 9/2024 | NS | 577 | 72 | 0.00 | 100.0 | ||
2023 Canadian (DFO) Survey (VEN2023001) | GB | Exchange | Summer 2024 | NS vs. EW | — | 42 | 1.44 | 92.9 | |
2022 Canadian (DFO) Commercial Samples (Q2-4) | GB | Exchange | Summer 2024 | NS vs. EW | — | 115 | 1.52 | 91.3 | |
2024 Spring Survey (202402) | Precision | 7/2024 | NS | 274 | 45 | 0.00 | 100.0 | ||
2023 Commercial Samples (Q3-4) | Precision | 3/2024 | NS | 112 | 40 | 0.00 | 100.0 | ||
2023 Autumn Survey (202304) | Precision | 3/2024 | NS | 227 | 45 | 0.63 | 97.8 | ||
2023 Commercial Samples (Q2) | Precision | 12/2023 | NS | 127 | 40 | 0.00 | 100.0 | ||
2023 Commercial Samples (Q1) | Precision | 9/2023 | NS | 162 | 40 | 0.00 | 100.0 | ||
2021 Canadian (DFO) Survey (TEL2021002) | GB | Exchange | Fall 2023 | NS vs. EW | — | 60 | 0.42 | 96.7 | |
2020 Canadian (DFO) Commercial Samples (Q2-4) | GB | Exchange | Fall 2023 | NS vs. EW | — | 100 | 1.23 | 94.0 | |
2022 Canadian (DFO) Survey (CAR2022102) | GB | Exchange | Summer 2023 | NS vs. EW | — | 59 | 0.92 | 93.2 | |
2021 Canadian (DFO) Commercial Samples (Q2-4) | GB | Exchange | Summer 2023 | NS vs. EW | — | 114 | 0.98 | 93.9 | |
2023 Spring Survey (202302) | Precision | 6/2023 | NS | 278 | 51 | 0.00 | 100.0 | ||
2022 Commercial Samples (Q1-Q4) | Precision | 2/2023 | NS | 150 | 45 | 0.00 | 100.0 | ||
2022 Autumn Survey (202204) | Precision | 2/2023 | NS | 283 | 42 | 0.00 | 100.0 | ||
2022 Spring Survey (202202) | Precision | 9/2022 | NS | 473 | 87 | 4.15 | 89.7 | n/s | |
2021 Commercial Samples (Q1-4) | Precision | 4/2022 | NS | 269 | 50 | 0.00 | 100.0 | ||
2021 Autumn Survey (202104) | Precision | 4/2022 | NS | 269 | 50 | 0.00 | 100.0 | ||
2021 Spring Survey (202102) | Precision | 7/2021 | NS | 383 | 80 | 0.84 | 97.5 | ||
2020 Commercial Samples (Q3) | Precision | 3/2021 | NS | 141 | 40 | 0.39 | 97.5 | ||
2020 Commercial Samples (Q2) | Precision | 3/2021 | NS | 223 | 41 | 0.00 | 100.0 | ||
2020 Commercial Samples (Q1) | Precision | 9/2020 | NS | 243 | 48 | 0.00 | 100.0 | ||
2019 Commercial Samples (Q4) | Precision | 5/2020 | NS | 291 | 60 | 0.00 | 100.0 | ||
2019 Commercial Samples (Q3) | Precision | 4/2020 | NS | 288 | 60 | 0.52 | 96.7 | ||
2019 Commercial Samples (Q2) | Precision | 4/2020 | NS | 303 | 60 | 0.21 | 98.3 | ||
2019 Commercial Samples (Q1) | Precision | 4/2020 | NS | 379 | 73 | 0.28 | 98.6 | ||
2019 Autumn Survey (201904) | Precision | 2/2020 | NS | 202 | 42 | 0.00 | 100.0 | ||
2019 Spring Survey (201902) | Precision | 2/2020 | NS | 447 | 92 | 1.76 | 97.8 | ||
2018 Autumn Survey (201804) | Precision | 5/2019 | NS | 247 | 56 | 0.00 | 100.0 | ||
2018 Commercial Samples (Q4) | Precision | 5/2019 | NS | 395 | 79 | 0.00 | 100.0 | ||
2018 Commercial Samples (Q3) | Precision | 5/2019 | NS | 463 | 56 | 0.00 | 100.0 | ||
2018 Commercial Samples (Q2) | Precision | 5/2019 | NS | 974 | 80 | 0.00 | 100.0 | ||
2018 Commercial Samples (Q1) | Precision | 5/2019 | NS | 1116 | 77 | 0.00 | 100.0 | ||
2018 Spring Survey (201802) | Precision | 6/2018 | NS | 310 | 64 | 0.74 | 98.4 | ||
2017 Commercial Samples (Q4) | Precision | 5/2018 | NS | 826 | 89 | 0.00 | 100.0 | ||
2017 Commercial Samples (Q3) | Precision | 4/2018 | NS | 1218 | 84 | 0.00 | 100.0 | ||
2017 Commercial Samples (Q2) | Precision | 3/2018 | NS | 1243 | 68 | 0.16 | 98.5 | ||
2017 Autumn Survey (201704) | Precision | 2/2018 | NS | 212 | 48 | 0.00 | 100.0 | ||
2017 Commercial Samples (Q1) | Precision | 1/2018 | NS | 1463 | 105 | 0.00 | 100.0 | ||
2017 Canadian (DFO) Spring Survey (TEL2017002) | GB | Exchange | Spring 2017 | QM vs. NS | — | 62 | 4.00 | 79.0 | 0.011 |
2016 Canadian (DFO) Spring Survey (TEL2016002) | GB | Exchange | Spring 2017 | QM vs. NS | — | 65 | 4.81 | 75.4 | n/s |
2016 Canadian (DFO) Commercial Samples (Q2-4) | GB | Exchange | Spring 2017 | QM vs. NS | — | 114 | 3.46 | 82.5 | n/s |
2016 Commercial Samples (Q1-2) | GB | Exchange | Spring 2017 | QM vs. NS | — | 152 | 2.36 | 84.9 | n/s |
2016 Autumn Survey (201604) | GB | Exchange | Spring 2017 | QM vs. NS | — | 72 | 1.18 | 95.8 | |
2016 Commercial Samples (Q4) | Precision | 7/2017 | NS | 1409 | 105 | 0.15 | 99.0 | ||
2017 Spring Survey (201702) | Precision | 7/2017 | NS | 659 | 94 | 0.00 | 100.0 | ||
2016 Commercial Samples (Q3) | Precision | 7/2017 | NS | 1201 | 86 | 0.00 | 100.0 | ||
2016 Autumn Survey (201604) | Precision | 5/2017 | NS | 667 | 78 | 0.00 | 100.0 | ||
2016 Commercial Samples (Q2) | Precision | 4/2017 | NS | 1314 | 96 | 0.00 | 100.0 | ||
2016 Spring Survey (201602) | Precision | 4/2017 | NS | 982 | 91 | 0.22 | 98.9 | ||
2016 Commercial Samples (Q1) | Precision | 3/2017 | NS | 2002 | 94 | 0.00 | 100.0 | ||
2015 Commercial Samples (Q4) | Precision | 4/2016 | NS | 1761 | 94 | 0.00 | 100.0 | ||
2015 Commercial Samples (Q3) | Precision | 4/2016 | NS | 824 | 95 | 0.00 | 100.0 | ||
2015 Commercial Samples (Q2) | Precision | 4/2016 | NS | 1034 | 95 | 0.00 | 100.0 | ||
2015 Commercial Samples (Q1) | Precision | 4/2016 | NS | 1561 | 93 | 0.00 | 100.0 | ||
2015 Autumn Survey (201504) | Precision | 4/2016 | NS | 813 | 94 | 0.00 | 100.0 | ||
2015 Spring Survey (201502) | Precision | 7/2015 | NS | 925 | 97 | 0.00 | 100.0 | ||
Cod Reference Collection | GB | Accuracy | 4/2015 | NS | — | 69 | 0.00 | 100.0 | |
2014 Autumn Survey (201404) | Precision | 4/2015 | NS | 303 | 65 | 2.18 | 98.5 | ||
2014 Spring Survey (201402) | Precision | 4/2015 | NS | 478 | 96 | 0.00 | 100.0 | ||
2014 Commercial Samples (Q4) | Precision | 4/2015 | NS | 1072 | 97 | 0.00 | 100.0 | ||
2014 Commercial Samples (Q3) | Precision | 4/2015 | NS | 987 | 98 | 0.00 | 100.0 | ||
2014 Commercial Samples (Q2) | Precision | 4/2015 | NS | 1456 | 96 | 0.00 | 100.0 | ||
2014 Commercial Samples (Q1) | Precision | 4/2015 | NS | 1049 | 100 | 0.00 | 100.0 | ||
2013 Commercial Samples (Q3-4) | Precision | 4/2014 | NS | 3010 | 102 | 0.00 | 100.0 | ||
2013 Commercial Samples (Q2) | Precision | 4/2014 | NS | 1796 | 96 | 0.00 | 100.0 | ||
2013 Autumn Survey (201304) | Precision | 2/2014 | NS | 404 | 84 | 0.00 | 100.0 | ||
2013 Commercial Samples (Q1) | Precision | 1/2014 | NS | 1597 | 99 | 0.10 | 99.0 | ||
2012 Commercial Samples (Q2-4) | GOM | Precision | 11/2013 | NS | 2988 | 98 | 0.38 | 96.9 | |
2013 Spring Survey (201302) | Precision | 10/2013 | NS | 697 | 97 | 4.95 | 81.4 | 0.015 | |
2012 Commercial Samples (Q2-4) | GB | Precision | 5/2013 | NS | 1345 | 98 | 1.48 | 92.9 | |
2012 Autumn Survey (201204) | Precision | 4/2013 | NS | 383 | 80 | 0.35 | 98.8 | ||
2012 Commercial Samples (Q1) | GB | Precision | 12/2012 | NS | 499 | 50 | 1.10 | 92.0 | |
2012 Commercial Samples (Q1) | GOM | Precision | 12/2012 | NS | 711 | 51 | 0.47 | 94.1 | |
2011 Massachusetts Survey (201191) | Precision | 3/2012 | NS | 268 | 74 | 0.00 | 100.0 | ||
2008 Commercial Samples (Q1-4) | GOM | Precision | 10/2011 | NS | 4333 | 96 | 0.64 | 95.8 | |
2010 Commercial Samples (Q2-4) | GOM | Precision | 9/2011 | NS | 4127 | 83 | 0.84 | 94.0 | |
2010 Commercial Samples (Q1) | GOM | Precision | 9/2011 | ER | 1243 | 102 | 1.39 | 90.2 | |
2010 Commercial Samples (Q1) | GOM | Precision | 9/2011 | NS vs. ER | 1243 | 101 | 4.13 | 66.3 | <0.001 |
2009 Commercial Samples (Q2-4) | GOM | Precision | 9/2011 | NS | 5260 | 92 | 1.68 | 85.9 | 0.030 |
2010 Canadian (DFO) Commercial Samples (Q2-Q4) & 2010 DFO Spring Surveys (NED201001 & NED201102) | GB | Exchange | Summer 2011 | NS vs. BH | — | 186 | 2.42 | 91.4 | |
2010 Commercial Samples (Q1-Q4) | GB | Precision | 4/2011 | NS | 3548 | 146 | 0.39 | 97.3 | |
2009 Commercial Samples (Q1) | GOM | Precision | 2/2011 | NS | 953 | 102 | 0.51 | 96.1 | |
2010 Spring Survey (201001) | Precision | 2/2011 | NS | 932 | 96 | 1.26 | 93.8 | ||
2008 Commercial Samples (Q4) | GB | Precision | 5/2009 | NS | 559 | 76 | 0.00 | 100.0 | |
2008 Commercial Samples (Q2) | GB | Precision | 4/2009 | NS | 659 | 50 | 0.13 | 98.0 | |
2008 Autumn Survey (200807) | Precision | 3/2009 | NS | 390 | 50 | 2.18 | 92.0 | ||
2003-2004 Massachusetts Surveys (2391, 2392, 2491, & 2492) | Precision | 7/2008 | NM | 761 | 100 | 4.65 | 90.0 | ||
2007 Commercial Samples (Q1-2) | GB | Exchange | Spring 2008 | NS vs. BH | — | 99 | 1.80 | 88.9 | n/s |
2006 Fall Survey (200610) | GB | Exchange | Spring 2008 | NS vs. BH | — | 60 | 2.83 | 88.3 | n/s |
2007 Commercial Samples (Q3-4) | Precision | 6/2008 | NS | 3139 | 81 | 0.35 | 97.5 | ||
2007 Commercial Samples (Q1-2) | Precision | 6/2008 | NS | 3486 | 100 | 0.13 | 99.0 | ||
Cod Reference Collection | GB | Accuracy | 6/2008 | NS | — | 75 | 0.27 | 98.7 | |
2008 Spring Survey (200803) | Precision | 6/2008 | NS | 548 | 100 | 0.11 | 99.0 | ||
2007 Autumn Survey (200709) | Precision | 6/2008 | NS | 250 | 50 | 0.00 | 100.0 | ||
2004 Canadian (DFO) Commercial & Observer Samples (Q3-4) | GB | Exchange | Spring 2007 | NM/NS vs. BH | — | 56 | 1.40 | 91.1 | |
2005 Canadian (DFO) Spring Survey (TEL2005545) | GB | Exchange | Spring 2007 | NM/NS vs. BH | — | 50 | 0.89 | 94.0 | |
2005 Commercial Samples (Q1) | GB | Exchange | Spring 2007 | NM/NS vs. BH | — | 53 | 2.28 | 84.9 | n/s |
2005 Autumn Survey (200510) | GB | Exchange | Spring 2007 | NM/NS vs. BH | — | 56 | 1.79 | 91.1 | |
Cod Reference Collection | GB | Accuracy | 5/2007 | NS | — | 100 | 0.61 | 97.0 | |
2006 Commercial Samples (Q1-4) | Precision | 5/2007 | NS | 7039 | 99 | 1.01 | 90.9 | ||
2006 Autumn Survey (200610) & 2007 Spring Survey (200703) | Precision | 5/2007 | NS | 1157 | 100 | 1.61 | 92.0 | ||
Cod Reference Collection | GB | Accuracy | 5/2006 | NS | — | 45 | 3.85 | 86.7 | n/a |
2006 Spring Survey (200604) | Precision | 5/2006 | NS | 421 | 50 | 0.19 | 98.0 | ||
2005 Commercial Samples (Q1-4) | Precision | 5/2006 | NS | 5103 | 80 | 1.20 | 93.8 | ||
2005 Autumn Survey (200510) | Precision | 5/2006 | NS | 377 | 50 | 0.22 | 98.0 | ||
2004 Commercial Samples (Q1-4) | GOM | Precision | 7/2005 | NS | 3618 | 112 | 0.75 | 93.8 | |
2003 Canadian (DFO) Commercial Samples (Q4) & 2004 DFO Observer Samples (Q3) | GB | Exchange | Spring 2005 | NM/NS vs. BH | — | 50 | 0.88 | 94.0 | |
2004 Canadian (DFO) Spring Survey (TEM2004004) | GB | Exchange | Spring 2005 | NM/NS vs. BH | — | 50 | 1.98 | 84.0 | n/s |
2004 Commercial Samples (Q2) | GB | Exchange | Spring 2005 | NM/NS vs. BH | — | 51 | 3.59 | 80.4 | n/s |
2004 Autumn Survey (200407) | GB | Exchange | Spring 2005 | NM/NS vs. BH | — | 49 | 2.59 | 85.7 | n/s |
Cod Reference Collection | GB | Accuracy | 6/2005 | NM | — | 106 | 1.53 | 90.6 | |
2003 Commercial Samples (Q4) | GOM | Precision | 4/2005 | NS | 1490 | 105 | 2.68 | 85.7 | 0.021 |
2004 Autumn Survey (200407) | GOM | Precision | 2/2005 | NM vs. NS | 174 | 60 | 0.00 | 100.0 | |
Cod Reference Collection | GB | Accuracy | 6/2004 | NS | — | 99 | 1.94 | 90.9 | |
2002 Canadian (DFO) Commercial Samples (Q3-4) | GB | Exchange | Winter 2003-2004 | NM/NS vs. BH | — | 46 | 2.60 | 78.3 | n/s |
2003 Canadian (DFO) Spring Survey (NED2003002) | GB | Exchange | Winter 2003-2004 | NM/NS vs. BH | — | 47 | 5.26 | 68.1 | n/s |
2002 Commercial Samples (Q1) | GB | Exchange | Winter 2003-2004 | NM/NS vs. BH | — | 46 | 2.40 | 89.1 | n/s |
2002 Autumn Survey (200209) | GB | Exchange | Winter 2003-2004 | NM/NS vs. BH | — | 52 | 3.83 | 88.5 | n/s |