A total of 72 Cyprinus carpio fingerlings were used as three dietary groups; one control and two experimental groups, in a feeding trial lasted 10 weeks. Two doses of humic acid were tested; 180 and 360 mg /kg feed in diets 1 and 2 versus the control diet (with no additives). Results indicated that the fish groups fed diets 1 and 2 had significantly (P
Key words: Cyprinus carpio; Humic acid; Growth performance, gills, liver, kidney, histology
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