Weight of all collected tilapia determined at the 1st
and 40th day were treated as initial weight and
final weight, respectively. Fish survival was also determined by counting individuals in each tank.
Daily weight gain (g day-1) (DWG) was calculated
as: (final weight - initial weight)/40 (g day-1).
Specific growth rate (SGR) was calculated using the
following formula: 100(ln W2 - ln W1) T-1. Where
W1 and W2 are the initial and final weight, respectively,
and T is the number of days (40) in the feeding
period.