Effects of different levels of inorganic supplementation in hydroponic system on growth and hemato-immunological responses of Nile tilapia (Oreochromis niloticus)

The aim of the present study was to investigate the effect of different levels of inorganic supplements in hydroponic system with the water recycle system on some parameters related to the Nile tilapia health status. So, 180 fish weighing 30 ± 3.8 g was divided into 9 experimental units (3 for each treatment). The treatments included diets supplemented with 25% (T2) and 75% (T3) inorganic minerals in hydroponic system. The control group (T1) fed diet with no supplementation. Following 70 days, blood samples were collected from caudal vein of 5 fish. Results indicated significant alterations in hematological and immunological indices in treatments compared to control (p<0.05). Generally, the intestine epithelium development in addition to the enhanced hematological and immune indices indicates the better health status in Nile tilapia following dietary manipulation by inorganic supplementation.