3.1. Culture performance
Harvesting parameter results of the total population in the tanks
(survival, biomass, yield and FCR) are presented in Table 3. Themodels
were significant for biomass, yield and FCR, and both tilapia population
(mixed-sex and 95% males) and species proportion (3:1, 5:1, 7:1 and
1:0) were sources of variability. Tilapia population significantly affected
biomass, yield and FCR with a significantly better outcome for the 95%
male population. Neither tilapia population nor species proportion
affected survival. Species proportion did not significantly affect FCR,
and significantly influenced final biomass and yield due to the higher
initial biomass in treatmentswith more tilapias (1:0 N 7:1 N 5:1 N 3:1).