Validation of the Scales for Age Determination in a Cyprinid, Scardinius erythrophthalmus (L., 1758)
2005
Cigdem Gursoy | Ali Serhan Tarkan | Hasan Acipinar | Ozcan Gaygusuz
In this study, scales were used to find out timing of annulus formation in Scardinius erythrophthalmus and following assumptions were tested; the existence of periodical marks, the ability to identify these marks correctly and to convert the number of marks into age. Time of annulus formation was derived from annual changes of opaque and hyaline zones on scale margins. Scales exhibited opaque and hyaline zones whose combination was formed once a year. Opaque zones appeared formed from July to February and the hyaline ones from March to June. A procedure is described to assess age by using the number of annuli, the condition of the scale edge and the capture data. The results of this study would be a useful guide for this species and also for other cyprinid species which is suitable for similar ageing techniques to improve precision of the age determination of fish.
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