Results of all QA/QC Exercises
for Butterfish, Peprilus triacanthus

Peprilus triacanthus


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
2017 Spring Survey (201702) Precision 12/2017 JD 632 65 1.98 90.8  
2016 Autumn Survey (201604) Precision 3/2017 JD 794 65 1.16 96.9  
2016 Spring Survey (201602) Precision 1/2017 JD 905 80 3.70 87.5 n/s
2015 Commercial Samples (Q1-Q4) Precision 3/2016 JD 226 48 4.55 87.5 n/s
2015 Autumn Survey (201504) Precision 2/2016 JD 814 76 2.85 93.4  
2015 Spring Survey (201502) Precision 2/2016 JD 580 72 1.43 95.8  
2014 Commercial Samples (Q1-Q4) Precision 1/2016 JD 450 80 3.39 90.0  
2014 Autumn Survey (201404) Precision 4/2015 JD 945 100 5.29 91.0  
2014 Spring Survey (201402) Precision 4/2014 JD 404 81 2.30 93.8  
2013 Autumn Survey (201304) Precision 2/2015 JD 836 86 5.07 90.7  
2013 Spring Survey (201302) Precision 11/2013 JD 571 92 1.44 93.5  
2009, 2010, 2011, 2012 Autumn Surveys (200904, 201004, 201105, 201204) Precision 5/2013 JD 3709 101 5.86 90.1  
2010, 2011, 2012 Spring Surveys (201001, 201102, 201202) Precision 4/2013 JD 1953 98 5.36 80.6 n/s
2009 Spring Survey (200902) Precision 9/2009 LDW 385 75 3.80 85.3 n/s
2003 Autumn Survey (200306) Precision 6/2009 LDW 837 75 4.08 85.3 0.040
2004 Autumn Survey (200407) Precision 5/2009 LDW 715 72 13.51 80.6 n/s
2005 Autumn Survey (200510) Precision 4/2009 LDW 760 73 14.01 72.6 0.035
2006 Autumn Survey (200610) Precision 4/2009 LDW 1052 100 3.49 93.0  
2007 Autumn Survey (200709) Precision 4/2009 LDW 750 74 8.47 83.8 n/s
2003 Spring Survey (200303) Precision 4/2009 LDW vs. NM 218 156 5.60 84.0 n/s
2005 Spring Survey (200503) Precision 4/2009 LDW 203 49 5.48 77.6 0.012
2006 Spring Survey (200604) Precision 4/2009 LDW 286 49 4.00 85.7 n/s
2008 Autumn Survey (200807) Precision 3/2009 LDW 888 73 11.94 75.3 n/s
2008 Spring Survey (200803) Precision 3/2009 LDW 355 75 2.17 93.3  
2007 Spring Survey (200703) Precision 3/2009 LDW 338 49 7.04 75.5 n/s
1984 Spring Survey (198402), 1984 Autumn Survey (198405), and 1984 Commercial Samples (all quarters) Calibration 1/2009 LDW -- 769 2.74 93.4  


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(File Modified Dec. 13 2017)