Results of all QA/QC Exercises
for Atlantic Mackerel, Scomber scombrus

Scomber scombrus


Initials for each age reader are given. All samples were collected by the Northeast Fisheries Science Center (NEFSC) except where indicated otherwise. In tests where agreement is below 90%, bias indicates either the P-value of a Bowker’s test or ‘n/s’ (test not significant at the α = 0.05 level).

Sample Source Test Type Date Completed Age Reader Number Aged Number Tested CV (%) Agreement (%) Bias
2018 Spring Survey (201802) Precision 6/2018 SJS 367 75 1.02 96.0  
2017 Commercial Samples (Q4) Precision 3/2018 SJS 656 97 0.21 99.0  
2017 Commercial Samples (Q2 & 3) Precision 2/2018 SJS 420 89 0.53 98.9  
2017 Spring Survey (201702) Precision 10/2017 SJS 676 100 0.48 98.0  
2017 Commercial Samples (Q1) Precision 8/2017 SJS 371 70 1.49 95.7  
2016 Commercial Samples (Q2 & 4) Precision 4/2017 SJS 614 100 1.05 96.0  
2016 Autumn Survey (201604) Precision 2/2017 SJS 348 70 0.40 98.6  
2016 Commercial Samples (Q1) Precision 10/2016 SJS 418 82 0.25 98.8  
2016 Spring Survey (201602) Precision 9/2016 SJS 639 90 1.57 96.7  
2015 Commercial Samples (Q4) Precision 4/2016 SJS 514 96 0.98 97.9  
2015 Autumn Survey (201504) Precision 4/2016 SJS 305 80 0.00 100.0  
2015 Commercial Samples (Q1) Precision 1/2016 SJS 476 90 1.30 96.7  
2014 Commercial Samples (Q1-Q4) Precision 10/2015 SJS 515 100 0.00 100.0  
2015 Spring Survey (201502) Precision 10/2015 SJS 640 100 0.00 100.0  
2014 Autumn Survey (201404) Precision 4/2015 SJS 275 58 0.00 100.0  
2014 Spring Survey (201402) Precision 9/2014 SJS 367 80 0.51 97.5  
2013 Spring Survey (201302) Precision 7/2013 SJS 820 100 0.00 100.0  
2012 Commercial Samples (Q1-Q4) Precision 3/2013 SJS 332 49 1.30 95.9  
2011 Commercial Samples (Q1-Q4) Precision 8/2012 SJS 256 75 0.00 100.0  
2012 Spring Survey (201202) Precision 7/2012 SJS 586 78 0.20 98.7  
2011 Autumn Survey (201105) Precision 7/2012 SJS 184 75 0.90 97.3  
2011 Spring Survey (201102) Precision 10/2011 SJS 481 122 0.39 99.2  
2010 Commercial Samples (Q1-Q4) Precision 9/2011 SJS 456 128 0.38 98.4  
2010 Autumn Survey (201004) Precision 5/2011 SJS 195 60 0.00 100.0  
2010 Spring Survey (201001) Precision 11/2010 SJS 468 105 0.00 100.0  
2009 Spring Survey (200902) Calibration 10/2010 SJS -- 200 0.24 99.5  
2009 Commercial Samples (Q3 and Q4) Precision 2/2010 SJS 55 50 0.00 100.0  
2009 Commercial Samples (Q1 and Q2) Precision 2/2010 SJS 614 80 0.79 97.5  
2009 Autumn Survey (200904) Precision 2/2010 SJS 141 50 0.57 98.0  
2009 Spring Survey (200902) Precision 9/2009 SJS 425 100 0.00 100.0  
2008 Commercial Samples (Q1) Precision 9/2009 SJS 678 172 0.26 97.7  
2008 Canadian (DFO) Commercial Samples (Q2) Exchange Spring 2009 NS vs. FG -- 100 0.50 96.0  
2008 Commercial Samples (Q1) Exchange Spring 2009 NS vs. FG -- 99 1.06 91.9  
2002 Spring Survey (200202), 2002 Commercial Samples (Q4), and 2004 Commercial Samples (Q2) Precision 10/2005 NS 519 100 0.68 95.0  

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