| Summary: | Different bony structure of pike, Esox lucius L., 1758 individuals caught from Lake Ladik between November 2009 and October 2010 were examined for age determination. Scale, vertebra, otolith (sagitta) and cleithrum were removed from 204 individuals. Before age determination, all hard structures are subjected to prior review. After preliminary examination, it was decided that vertebra, sagittal otoliths and cleithra structures were not usable for age estimation. Therefore, these bony structures were not used in age analysis. It was concluded that scale is the most suitable bony structure for age determination in Lake Ladik population of this species. The scales were only analyzed three times by one reader. As a result, mean ages, percent agreement (3/3), average percent error, coefficient of variation were calculated as 3.18, 57.35 %, 6.14, 13.99, respectively in reading scale.
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