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Windowpane Flounder: QA/QC Exercise Results

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

Windowpane Flounder, Scophthalmus aquosus

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 SourceStockTest TypeDate CompletedAge ReaderNumber AgedNumber TestedCV (%)Agree-ment (%)Bias
2023 Spring & Autumn Surveys (202302 & 202304)GBPrecision4/2024SJS164386.4465.8n/s
2022 Spring & Autumn Surveys (202202 & 202204)GBPrecision6/2023SJS178446.8770.5n/s
2019 & 2021 Spring Surveys (201902 & 202102)GBPrecision5/2022SJS2805012.4370.00.017
2016 Autumn Survey (201604)GBPrecision7/2020SJS217398.9871.8n/s
2014 & 2015 Autumn Surveys (201404 & 201504)GBPrecision9/2016SJS368614.7277.0n/s
2004 & 2005 Autumn Surveys (200407 & 200510)GBPrecision11/2015SJS189452.9382.2n/s

Last updated by Northeast Fisheries Science Center on April 12, 2024

Age and Growth