Generally, dietary effect on weight gain of fish results from body nutrient contents including water, protein, lipid and ash.
The proximate composition of the fish body has been used as a parameter to determine and optimize the supplementation
of functional feed ingredients in animal feed (Dumas et al., 2010). This study determined whether the differences in growth
response among experimental fish would resulted from the variation in body chemical composition. Our results showed that
whole-body composition, including moisture, crude lipid, crude protein, and ash, was not affected by either prebiotic inulin
or JA supplementation. Dietary supplementation with inulin also did not significantly change the whole-body composition
in hybrid striped bass and beluga (Reza et al., 2009; Burr et al., 2010)