respect, contribution of lettuce to waste treatment
compartment have been well addressed (Rakocy,
1995). During fish development (growth), the stand
biomass of fish is increased per unit of the
experimental system. It is generally accepted that
the rate of sludge production and feed nutrients
assimilation in a culture system, depending on the
life cycle of the fish, which can be varied during
the time in an experimental culture system. Therefore,
identification of such items can be crucial in
this sense. At this study, it was tried to qualify and
quantify the fate of input feed nutrients associated
with physical and biological factors involving in a
recirculating fish culture system. Thus, the main
objective of this study was to evaluate the cycle of
feed nutrients and sludge production, with an
emphasis on characterization of wastewater production
in different stages of red tilapia growth.