Citric acid supplementation did not affect the ADC of P and dry matter,
fecal P content, and fish body and vertebral mineral content. These
results suggested that citric acid did not influence the mineral utilization
of juvenile yellow catfish. This is in contrast with a number of
other studies. Citric acid supplementation at 30 g kg−1 diet significantly
increased bone P content in L. rohita (Baruah et al., 2005). An increase in
the apparent availability of Ca and P was reported in rainbow trout fed 50 g kg−1 diet citric acid (Sugiura et al., 1998). Addition of 20 g kg−1 and
30 g kg−1 diet citric acid significantly increased the Ca and P contents of
muscle in juvenile Beluga sturgeon (Huso huso), however 10 g kg−1 diet
citric acid did not affect these parameters (Khajepour and Hosseini,
2012). Some reports concluded that the improvement of the digestibility
of nutrients depended on the level of organic acid used (Partanen
andMroz, 1999). In the present study,mineral utilization was unaffected
by citric acid supplementation, likely due to the low level of citric
acid supplemented (2 g kg−1).