3.6. Consumption of water, energy, and feed
Considering that the current study was designed on a laboratory
scale, only the cost of water, electricity, and feed, among others, during
the experimental period was used to compare the cost of running the
two types of systems(Table 5).
Because both of the culture models were closed systems, the water
consumption for production per kilogram of fish was low for both
systems. The consumption in the RAS tanks was lower because there
was some water loss in the BFT tanks when the biofloc was taken out.
In the RAS, a water treatment unit and a pump for recycling water
were added; therefore, the related energy cost and depreciation cost
of the equipment was higher compared with that of BFT.
Carbon sources were added to the BFT tanks regularly to maintain a
certain C:N ratio and the cost for carbon sources was one of the major