Results of American plaice age-reader precision test against randomly selected samples of fish under 20 cm from the 2012 and 2013 NEFSC spring surveys. This size class, which is aged using whole otoliths, has not previously been tested. (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.

Species: American Plaice (under 20 cm)Test Type: Precision
Sample Source: 2012 and 2013 Spring Surveys (201202 & 201302)
Age Reader: JD Date Completed: December 2014
Number Aged: 487 Number Tested: 72
CV: 4.82% Agreement: 84.7%
Bowker's Test: Not significant


A. Agreement Plot

American Plaice Agreement Plot

B. Age-Frequency Table

Test Production Age
Age 0 1 2 3 4 5 Total
Total 17 27 22 6 72
0
1 15 1 16
2 2 24 4 30
3 2 18 1 21
4 4 4
5 1 1


C. Results Summary

Production Age N N Agreed Percent Agreed Average Test Age
1 17 15 88 % 1.12
2 27 24 89 % 2.04
3 22 18 82 % 2.82
4 6 4 67 % 4.00


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