Nutritional Efficacy of Acid Fish Silage in Labeo Rohita at Grow out Stage

Fish acid silage was prepared by minced fish body viscera and formic acid and its efficacy was studied in Labeorohita at grow out stage. Three iso-nitrogenous diets (treatments), containing 32% crude protein (CP)was prepared using this silage. In the treatment-1(T1) diet, only fish acid silage was used, treatment-2(T2) dietwere prepared by using 75% fish 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 (T3) diet. In the control diets (T0) fish silage was replaced with fishmeal. The experiment was conducted in 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 differencesin weight gain, FCR and SGR were observed between T0 and T2 diets. The proximate analysis of the carcass showed significantly higher protein content for T2 and T0 diets. Similarly, higher fats and ash content were observed for T2 diets. Significantly higher WBCs and platelets were noted in the blood of fish fed with T2 diets. Histological studies showed normal liver functioning similarlyrenal tubules and glomerulus in kidneys were also not affected with any diet. The intestine showed hypercalciafor all the four diets. It can be concluded from the present study that fish acid silage isnutritious product that has no adverse effects on body organs and can be used to prepare cost-effective fish feeds.