Additionally, probiotic cells located in the intestine
not only improve microbial balance but also, in the process,
they further enhance nutrient absorption and utilization [47,48].
Such improvements could be due to enhanced protease activity and
digestibility coefficients. Additional factors, including variations in
intestinal bacterial communities, may contribute to improve
growth performance of fish [49]. Actually, previous research has
shown that the growth and/or activities of some bacteria such as
lactic acid bacteria and Lactobacillus sp. can be value-added by
probiotics [5,11,20,21].