At the end of the experiment, all fish were counted and groupweighed to determine weight gain, specific growth rate (SGR), feed
intake, feed conversion ratio (FCR), nitrogen retention, lipid retention, hepatosomatic index (HSI) and survival using the following formulae: Weight gain (%) = 100 × [(WF − WI) / WI], where WF is final
individual fish weight (g) and WI is initial individual fish weight (g);
SGR (% day−1) = 100 × [(ln(WF) − (lnWI)) / days], where WI is initial individual fish weight (g) and WF is final individual fish weight
(g); FCR = individual dry feed intake (g)/individual wet weight
gain (g); Retained nitrogen (%) = 100 × [(NF − NI) / N] where NF
is the final nitrogen content in fish (g), NI is the initial nitrogen content in whole fish (g) and N is the total nitrogen intake (g); Retained
lipid (%) = 100 × [(LF − LI) / L] where LF is the final lipid content in fish
(g), LI is the initial lipid content in whole fish (g) and L is the total lipid
intake (g); HSI (%) = 100 × (liver weight / whole body weight) (g);
survival (%) = 100 × (final number of fish / initial number of fish).