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Windowpane Flounder: QA/QC Exercise Results

Results of the QA/QC exercises for ageing windowpane flounder.

Windowpane Flounder, Scophthalmus aquosus

Image
Windowpane flounder illustration. Credit: Jack Hornady.

Sandy Sutherland (SJS) has been working with Windowpane Flounder since 2015. Whole otoliths viewed with reflected light, except for large fish (>30cm) which are cut in half and viewed with reflected light. Only samples from Georges Bank (GB) are currently aged.

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 Stock Test Type Date Completed Age Reader Number Aged Number Tested CV (%) Agree-ment (%) Bias
2019 & 2021 Spring Surveys (201902 & 202102) GB Precision 5/2022 SJS 280 50 12.43 70.0 0.017
2016 Autumn Survey (201604) GB Precision 7/2020 SJS 217 39 8.98 71.8 n/s
2014 & 2015 Autumn Surveys (201404 & 201504) GB Precision 9/2016 SJS 368 61 4.72 77.0 n/s
2004 & 2005 Autumn Surveys (200407 & 200510) GB Precision 11/2015 SJS 189 45 2.93 82.2 n/s

Last updated by Northeast Fisheries Science Center on December 27, 2022

Age and Growth