Results of all QA/QC Exercises
for Witch Flounder, Glyptocephalus cynoglossus

Glyptocephalus cynoglossus


Initials for each age reader are given. All samples were collected by the Northeast Fisheries Science Center (NEFSC). 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 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

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