twoway-
ANOVA, using tilapia population (mixed-sex and 95% males) and
species proportion (3:1, 5:1, 7:1 and 1:0) as factors.When the ANOVA
result from a dependent variable indicated significant differences
(P b 0.05), these were tested with the Tukey multicomparison test of
means, using a significance level of P b 0.05. Survival (%) data were
normalized using the arcsine of the square root transformation. Fish
condition factor and FCR were transformed to ranks. The analyses
were run using the InfoStat v.2008 statistical package