Abstract: In this study, population structure, growth and reproduction properties of Liza abu which lives in Devegecidi Dam Lake and its inlets were observed between November 2008 and January 2010 and totally 1005 individuals sampled. Maximum age, fork length and weight were determined as IV, 21.8 cm, 122 g, respectively. Sex ratio (male:female) was calculated as 1:0.94. Condition factor was found as 1.261±0.003. No any mature sample could be caught from the dam lake tributaries between April and July. At the same period abundantly mature samples could be caught from the dam lake. This situation has led to the opinion that reproduction go on in the dam lake. Fecundity was found 26393±1375 eggs per female and 538±21 eggs per gram gonad weight. The eggs diameters were calculated as 0.6±0.02 mm.