Water quality parameters
The water temperature and DO levels were similar in all tanks
during the growth test (Table 2). Significantly lower alkalinity concentrations
were observed in the tanks with control water. Total ammoniacal
nitrogen concentrations were significantly lower in the
tanks with BFT water than in those with control water. Nitrite-N concentrations
seemed to vary randomly according to type of water and
origin of the larvae. No significant differences were observed for the
nitrate-N concentrations.