Results of winter flounder age-reader precision test
using randomly selected samples from the 2011 Massachusetts state spring survey.
Otoliths were used for age determinations. (A) Agreement plot, showing both the production and test ages. A small amount of noise was added to the data to improve visibility of overlapping data points.
(B) Age-frequency table, showing the test ages across the top
and the production ages on the left. Numbers in the shaded boxes indicate agreement between
the two ages. Numbers above this diagonal indicate fish which were under-aged during the test;
those below the shaded boxes were over-aged. Total age frequencies are given by age for both
the test and production ages. (C) Results summary, indicating results of the test for each production age.
2011 Massachusetts Spring Survey (201191)
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