During the experimental period,water temperaturewasmaintained
around 25.4 to 26.7 °C, pHat 8.05 to 8.14, ammonia nitrogen lower than
0.05 mg L−1, dissolved oxygen above 5.0 mg L−1, and salinity from 7.8
to 8.4 g L−1. The experiment was conducted in dark environment except
at time for siphoning out feed residue and feces, or checking the
status of crabs. Exuviae and dead crabs (if any)were removed,weighed
and recorded daily. Uneaten feeds were collected and washed with
double-distilled water to remove any adhering salts, oven-dried at
90 °C for 5 h, and weighted.