Research on the energy budget (or energy partitioning) of red tilapia (Oreochromis

mossambicus × Oreochromis niloticus) juveniles (mean weight of 10.8 g) was conducted with a 2 x 2

factorial design consisting of two environmental culture conditions: temperature (28oC and 34oC) and

salinity (0 ppt and 12 ppt). The results showed that there was no synergistic effect of experimental

temperature and salinity on the energy partitioning of red tilapia. Feed intake, growth, ingested energy

(C), production energy (P), ingested nitrogen, and production nitrogen of experimental fish were

significantly reduced at high salinity (12 ppt) while only fecal loss nitrogen was substantially decreased

at high temperature (34oC). The lowest values of feed intake, growth, C, P, F (fecal loss energy), U

(excretory loss energy), and R (heat loss energy) were found at 28°C-12ppt. The energy budget of red

tilapia at 34°C-12 ppt is as follows: 100 C = 26.7 P + 19.6 F + 3.65 U + 50.0 R, which indicates that

this red tilapia can develop and grow well at 34°C-12 ppt.