A 60-day feeding study was performed to evaluate the role of dietary commercial wood charcoal (CWC) in fish growth performance, body composition and water quality of fingerlings red tilapias (Oreochromis mossambicus 9 Oreochromis niloticus). Four levels of charcoal (10, 20, 30 and 40 g kg À1 ) were added to the control diet (0 g kg À1 CWC) and fed to red tilapias (initial weight of 1.20 AE 0.04 g). At the end of the feeding trial, the fish weight gain, specific growth rate, feed conversion ratio, protein efficiency ratio and energy retention of the fish groups fed 30 and 40 g kg À1 (CWC) in diet were significantly (P < 0.05) higher comparing with all other tested fish groups. Moreover, some proximate composition such as crude protein and nitrogen retention efficiency g kg À1 of the fish groups fed on 30 and 40 g kg À1 CWC diets showed higher values (P < 0.05) than those of other tested fish groups (0, 10 and 20 g kg À1 CWC). Apparent digestibility coefficients of protein and dry matter were improved (P < 0.05) in CWC-tested fish groups compared to the control fish group. These data were powered by the data of the water quality that showed significant (P < 0.05) enhancement in both dissolved oxygen and ammonia concentrations by the increment in dietary charcoal levels. The above-mentioned parameters' data suggested that 30 g kg À1 dietary CWC can be considered as a suitable level to maintain normal growth of red tilapia juveniles as well as to enhance water quality of the rearing area.
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