Biochemical Studying of Anabaena (Cyanobacteria) On Nile Tilapia

An 6- weeks feeding trial was conducted to investigate the effect of Anabaena algae (cyanobacteria) supplemented to ration of Nile Tilapia on growth performance, survival rate, immunity, hematological studied, serum biochemistry and its protective effect against the challenge with A. hydrophila I/P injection . Sixty Nile tilapia were allotted into three equal groups: control fed on non- supplement ration, group fed on ration contain Anabaena 10 % and group fed on ration contain Anabaena 15 %, (control, A1 and A2) and were fed ration equal 3% of the total fish body weight. The results indicated that cyanobacteria supplementation improved (P≤0.05) final body weight, weight gain, feed intake and feed conversion ratio when compared with the control. Cyanobacteria supplementation improved hematological indices of blood in Nile tilapia fish. Moreover, it was observed that higher supplementation level (A2) of cyanobacteria increased blood serum protein and globulin concentrations but had no effect on albumin concentration. However, cyanobacteria deteriorate some blood serum parameters which indicate its damage effect on hepatic and renal cells. Experimental infection with A. hydrophila deteriorate most of the tested parameters and reduces kidneys function. Cyanobacteria inclusion in Nile tilapia diet had an protective effect against A. hyrophila infection.