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=-2.09593-2.9819LogL and W=0.008018L2.9819 (r=0.993) for male fish, LogW=-2.12773-3.0508LogL and W=0.007452L3.0508 (r=0.996) for female fish and LogW=-2.13401-3.0511LogL and W=0.007345L3.0511 (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, to = -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).

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=-2.09593-2.9819LogL and W=0.008018L2.9819 (r=0.993) for male fish, LogW=-2.12773-3.0508LogL and W=0.007452L3.0508 (r=0.996) for female fish and LogW=-2.13401-3.0511LogL and W=0.007345L3.0511 (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, to = -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).