17 STAGE M. S. Haider M. Ashraf H. Azmat A Khalique A. Javid G. Mustafa S. Ashraf Irfan M. Altaf Z. Ali F. Bashir Journal of Animal and Plant Sciences JAPS 20152015/06/01 25 3 253-260 1018-7081 NA Fish acid silage was prepared by minced fish body viscera and formic acid and its efficacy was studied in Labeo rohita at grow out stage. Three iso-nitrogenous diets (treatments), containing 32% crude protein (CP) was prepared using this silage. In the treatment-1 (T ) diet, only fish acid silage was used, treatment-2 (T ) diet were prepared by using 75% fish 1 2 silage and 25% soybean meal and rice bran while 50 % acid silage and 50% soya bean meal and rice bran were used in treatment-3 (T ) diet. In the control diets (T ) fish silage was replaced with fishmeal. The experiment was conducted in 3 0 12 fiber glass tanks having dimensions 36´ x 36´ x 24´ (Length× width× depth) and stocking density of 15 fish/ tank. There were three replicates for each of the treatment and control diet and the fish in all the tanks were fed @ 4% of their body weight twice daily. Non-significant differences in weight gain, FCR and SGR were observed between T and T 0 2 diets. The proximate analysis of the carcass showed significantly higher protein content for T and T diets. Similarly, 2 0 higher fats and ash content were observed for T diets. Significantly higher WBCs and platelets were noted in the blood 2 of fish fed with T diets. Histological studies showed normal liver functioning similarly renal tubules and glomerulus in 2 kidneys were also not affected with any diet. The intestine showed hypercalcia for all the four diets. It can be concluded from the present study that fish acid silage is nutritious product that has no adverse effects on body organs and can be used to prepare cost-effective fish feeds. are Indian major carps i.e. Labeo rohita, Cirrhinus Proximate analysis, Fish body viscera, Growth, Labeo rohita, Blood analysis Pakistan Agricultural Scientists Forum https://thejaps.org.pk/AbstractView.aspx?mid=2015-JAPS-640