Three hundred and sixty healthy tilapia (Oreochromis
niloticus) were provided by the Fish Hatchery of
Hangzhou, China and randomly allocated to four
treatments, each of which had three 200-l tanks of 30
fish per tank. The tilapia received the same diet,
containing 37.53% crude protein, 3.82% crude fat,
and 10.79% crude ash related to wet matter, and
6.89% moisture, based on NRC (1993) recommendations.
Different probiotics (T-1, Bacillus subtilis
B10; T-2, Bacillus coagulans B16; T-3, Rhodopseudomonas
palustris G06) were added to water of
the tanks at final concentration of 1 9 107 cfu ml-1
every 2 days,