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¹ Eğirdir Fisheries Research Institute, 32500, Eğirdir, Isparta, Turkey DOI : 10.4194/1303-2712-v11_4_19 Viewed : 4423 - Downloaded : 3327 In this study, growth properties of sand smelt (Atherina boyeri, Risso 1810) in İznik Lake were determined. Total catched 237 sand smelt fish in January-December 2006 were 28.3% male and 71.7% female. Female male ratio was 2.5:1. Fork length between 2-10.6 cm, weight 0.06-10.5 g, ages I-IV were changed and 20.7% fish were I. age were determined. Differentiation between average lenght frequency of groups wasn’t statistically significant (P>0.05) in I. age group. The data were obtained LogW=-2.09593-2.9819 Log L and W=0.008018 L^2.9819 (r=0.993) for male fish, Log W=-2.12773-3.0508 Log L and W=0.007452 L^3.0508 (r=0.996) for female fish and Log W=-2.13401-3.0511 Log L and W=0.007345 L^3.0511 (r=0.994) for male and female fish. Total, natural and fishery mortality rates respectively were M=0.666 y-1, F= 0.1591 y^-1 and E=0.193 y^-1. The highest relative length and weight growth were shown male and female between I-II ages. For female and male fish W_∞=32.3, K=0.23794, t_o = -0.1994, b= 3.0511 and Von Bertalanffy weight growth equation W_(t)=32.3*(1-e^{-0.23794(t+0.1994))3.0511} were determined. Condition factor were determined K=0.780 for male and K=0.822 for female and differentiation between sexual groups for II to III statistically were not significant (P>0.05). Keywords : Growth, mortality rate, von Bertalanffy, condition factor