Proximate chemical analysis

Items	0.00%	*At Origanum vulgare* extract % of the diets**
Items	(control)	1.50%	1%	0.50%
Moisture	74.64 ± 068^a	73.77 ± 0.14^a	73.75 ± 0.27^a	73.84 ± 0.46^a
Crude protein	60.00 ± 0.06^a	60.79 ± 0.32^a	60.59 ± 0.37^a	60.68 ± 0.39^a
Total lipids	19.72 ± 0.22^a	19.79 ± 0.36^a	19.67 ± 0.18^a	19.97 ± 0.49^a
Ash	19.81 ± 0.31^a	19.24 ± 0.55^a	19.11 ± 0.61^a	1.31 ± 0.60^a

a-no significant different in the same row from the table at P<0.05.Proximate chemical composition of fish at start of this study was 75.22 ± 0.30% moisture; 59.04 ± 0.82% protein; 18.11 ± 0.76% lipid and 21.42 ± 0.57% ash.

Table 2: Proximate chemical analysis on dry matter basis (mean ± SE) of Nile tilapia fed diets containing different levels of Origanum vulgare extract.