Results of black sea bass age-structure comparision test, using otoliths and scales from randomly selected samples from the 2012 NEFSC spring survey. (A) Agreement plot, showing both the scale and otolith ages. A small amount of noise was added to the data to improve visibility of overlapping data points. (B) Age-frequency table, showing the scale ages across the top and the otolith ages on the left. Numbers in the shaded boxes indicate agreement between the two structures. Numbers above this diagonal indicate fish given higher scale ages; those below the shaded boxes had higher otolith ages. Total age frequencies are given by age for both structures. (C) Results summary, indicating results of the test for each scale age.

Species: Black Sea Bass Test Type: Inter-Structure Comparison
Sample Source: 2012 Spring Survey (201202) Structure: Otoliths vs. Scales
Age Reader: JD Date Completed: April 2013
Number Tested: 85    
CV: 4.55% Agreement: 75.3%
Bowker's Test: Not significant   


A. Agreement Plot

Black Sea Bass Agreement Plot

B. Age-Frequency Table

Age Age (Scales)
(Otoliths) 0 1 2 3 4 5 6 7 8 9 10 Total
Total 13 20 24 16 6 2 3 1 85
0
1 13 13
2 20 1 21
3 19 4 1 24
4 4 6 3 13
5 6 2 1 9
6 1 1
7 3 3
8
9 1 1
10


C. Results Summary

Age (Scales) N N Agreed Percent Agreed Average Age (Otoliths)
1 13 13 100 % 1.00
2 20 20 100 % 2.00
3 24 19 79 % 3.12
4 16 6 38 % 4.12
5 6 2 33 % 4.17
6 2 1 50 % 5.50
7 3 3 100 % 7.00
8
9
10 1 0 0 % 9.00


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(File Modified Jan. 14 2015)