At the end of the experiment, after all fish were weighed and measured, the following technological efficiency indicators were calculated: growth rate, food conversion ration, specific growth rate and the protein efficiency ratio using the following equations [8]: ٢ Weight gain (W) = Final weight (Wt) – Initial weight (W0) (g) ٢ Food conversion ration (FCR) = Total feed (F) / Total weight gain (W) (g/g) ٢ Specific growth rate (SGR) = 100 x (ln Wt - ln W0) / t (% BW/zi) ٢ Protein efficiency ratio (PER) = Total weight gain (W) / amount of protein fed (P) (g) The statistical analysis was performed with the help of the programme SPSS 15.0 for Windows.