The goal of this thesis is to determine the share of Atherina hepsetus and Atherina boyeri in fishing samples from multiple locations along the Adriatic coast and to analize the basic morphometric features, condition factors and length-weight relationships. A total of 10 samples comprising of 30 specimens were collected between 2.6.2017. and 15.12.2017. 8 samples were A. boyeri and 2 were A. hepsetus. Mass and basic morphometric features were measured for each sample. Microsoft Excel was used to calculate mean values of mass, total length, Fulton condition factor and length-weight relationship. Number of rows of scales on the body was measured as this was the primary method to differentiate these two species. Total body lenght and mass were used to calculate the coefficent of regression of A. boyeri which was b = 3,6013 and the coefficient of determination was R2 = 0,8932. Results for A. hepsetus were b = 3,1488 and R2 = 0,9512. A positive alometric growth was visible for both species according to the coefficients of regression and the model was proved to be good for both species according to the coefficients of determination. A positive correlation between the total body length and the Fulton condition factor was visible for both species.