The intercalibration of age readings represents a crucial step in the ageing procedure; the use of different sampling methods, structures, preparation techniques, and ageing criteria can significantly affect age and growth data. This study evaluated the precision and accuracy of ageing for the most important North Atlantic (NA) and Mediterranean (M) ray species, , , , and , through exchange exercises carried out by readers from different laboratories. In addition, growth parameters were estimated from the obtained data.
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