Similar result was observed in grass carp (Ctenopharyngodon
idellus) [60] and shrimp [8]. The enhanced antioxidant capability
was further supported by the relatively low MDA content observed
both in liver and plasma of fish fed diets supplemented
B. licheniformis. The decreased MDA content usually indicates increased enzymatic antioxidants of the defense system due to the
fact that MDA is a direct evidence of the toxic processes caused by
free radicals