Reproducibility of age determination by scale and vertebra in Pontic shad (Alosa pontica Eichwald, 1838), from the Danube
Visnjic-Jeftic, Z., University of Belgrade, Belgrade (Serbia). Center for Multidisciplinary Studies | Lenhardt, M., Institute for Biological Research Sinisa Stankovic, Belgrade (Serbia) | Navodaru, I., Danube Delta National Institute, Tulcea (Romania) | Hegedis, A., University of Belgrade, Belgrade (Serbia). Center for Multidisciplinary Studies | Gacic, Z., University of Belgrade, Belgrade (Serbia). Center for Multidisciplinary Studies | Nikcevic, M., University of Belgrade, Belgrade (Serbia). Center for Multidisciplinary Studies
Specimens of Pontic shad (Alosa pontica) were collected during April and May 2006 in the Danube river (rkm 863) just downstream of the Iron Gate (Djerdap) II dam. Twenty-eight scales and 30 vertebrae were prepared and given to five interpreters with fish aging experience of from 3 to 30 years and with shad aging experience of from 0 to 12 years. Interpreters with experience in shad age determination showed lower values for the index of average percent error (IAPE) and an index of coefficient of variation (ICV). In regard to within-interpreter reproducibility, no significant differences were found between scale and vertebrae as structure for age determination. The most experienced reader showed the lowest value for IAPE, while the least experienced reader showed the highest value for IAPE. The results of this word indicate that experience in age determination by particular structure had more impact on age determination precision than specificity of structure, scale of vertebra. More work is needed on adopting standard protocols that must include some sort of common interaction between responsible age readers.
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