Growth performance
Therewas no obvious effect of probiotics on thewater quality in the four feed treatments.
Total ammonium (0–0.2 mg l−1), nitrite (0–0.1 mg l−1) and pH (7.0–7.4) were stable and
within acceptable ranges (Boyd and Tucker, 1998). The common carp survival rate of all
the feed treatments was 100% after 60 days culture and there was no different (P>0.05)
between trials 1 and 3 treated with the probiotics and control.