Back-calculate length-at-age estimates of Capoeta capoeta gracilis in dough stream, South Eastern Caspian Sea, Iran
Abstract
This study was carried out between April and May 2010 and 2011 in Dough Stream, southern basin Caspian Sea. A total 130 individuals of C. c. gracilis were sampled to study back-calculation estimations. Fish ages were determined from operculum. The lengths of fish at previous ages (Back-calculated lengths) were estimated from operculum using back-calculation method. Back-calculations were based upon a linear regression model developed by Fraser and Lee. The calculated total length values for male and female ranged from 6.372-16.208 and 6.935-16.518 cm respectively. Calculated lengths were found smaller than the observed lengths
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