“…This requirement is less than the requirement reported for brook trout 95, gilthead seabream 63–83, Pacific salmon 150–200 (Halver, ; NRC, ) but higher than the requirement reported for channel catfish 14 (Halver, ), rainbow trout 10–50 (Poston & Wolfe, ), channel catfish 7.4 (Ng, Serrini, Zhang, & Wilson, ), African catfish 33 mg/kg (Morris, Backer, & Davies, ), Indian catfish 25 (Mohamed & Ibrahim, ) and comparable to the requirement of common carp 28‐50 (Halver, ), L . rohita, 33, C. mrigala 30 (Ahmed, ), grass carp 34.01‐42.08 (Li et al., ) mg/kg of diet. The discrepancy in the niacin requirements possibly because of the variations in fish size, quality of the diet, laboratory conditions, species differences, methodology and assessment criteria (Mohamed & Ibrahim, , NRC, , Jiang et al., ; Xia et al., ; Li et al., , ).…”