author(s)
Sharda, OP Sharma and VP Saini

abstract
The present study deals with the “Replacement of Fishmeal with Soybean Meal in Nile Tilapia (Oreochromis niloticus) Diet”. The fish meal was replaced @ 0 to 100% in experimental diets. As such five diets having 0-100% fish meal replaced with soybean meal i.e., 0% (control), 25 (T₁), 50 (T₂), 75 (T₃) and 100% (T₄) were prepared. The experiment was conducted in triplicate in 200 liters plastic tanks for 42 days. These experimental fish were fed @8% of body weight per day. The growth performances of test fish were observed at weekly interval. Similarly, experimental water quality parameters were also monitored at weekly intervals. The results of this study indicated a significant difference in net weight gain, per cent weight gain, specific growth rate, food conversion ratio and gross conversion efficiency of fry fed with different diets. The highest net weight gain, per cent weight gain, SGR, and GCE were 3.18g (T₀), 185.64% (T₀), 0. 928% (T₀) and was 0.343 (T₀) respectively. The fish fed with fish meal and soybean meals have also indicated better food utilization with lesser food conservation ratio (FCR) i.e.3.22 in control as compared to other experimental feeds including. Proximate composition of fish fed with fish meal and soybean meal in mixed diet further confirmed that its biochemical configuration was fairly satisfactory. The results of this study indicated that the increasing level of soybean meal in fish diet has a negative impact on growth and growth parameters. As the growth significantly decreased with increasing soybean levels in fish diet. On the basis of this experiment, it is concluded that 25% of fish meal can be replaced with soybeanMeal because the growth Meal because the growth difference between a fish meal based diet (100%) and fish meal –soybean meal (75 +25) based diet had no significant growth. However, it is recommended replacing 25% of fish meal with soybean meal.