3.2. 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.
3.3. Salinity stress test
One hour after the salinity stress, a significantly higher survival was
observed for the larvae originating from the BFT broodstock tank than
for the larvae originating from the control broodstock tank (Fig. 2).
After 24 h in freshwater, an additional 30% mortality was observed for
both treatments. However, the number of survivors among the larvae
originating from the BFT tank was still significantly higher than for the
larvae of control origin.
4. Discussion
The conditions under