In this study the ages of Capoeta trutta (Heckel 1843) inhabiting Keban Dam Lake were determined from scales. The mean fork lengths determined using the back-calculation method were l₁=70.59, l₂=119.37, l₃=167.53, l₄=195.97, l₅=221.03, l₆=250.52, l₇=274.63 and l₈=300.38 mm for males, l₁=68.87, l₂ =117.03, l₃=166.34, l₄=203.91, l₅=230.17, l₆=248.20, l₇=267.98 and l₈=294.69 mm for females, l₁=63.45, l₂=105.92, l₃=151.54, l₄=188.20, l₅=212.33, l₆=245.05, l₇=270.85 and l₈=295.97 mm for all fish samples. The calculated length of any of the age groups was always smaller than the real length measured for the same age group. The gap between calculated and measured lengths increased when the scales of older fish were used in the calculations.
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