Conventional fish feed ingredients like fishmeal and plant proteins are not only expensive but also face supply challenges due to increasing demand. This study aimed to address this issue by exploring alternative, cost-effective protein sources to enhance the income of fish farmers. In this research, Cassia tora leaf meal was investigated as a potential protein source for the growth and survival of Labeo rohita fingerlings. Three experimental diets were formulated, containing Cassia tora leaf meal at 50%, 75%, and 100% of the total dietary protein, with one diet serving as the control. All diets maintained a consistent crude protein content of 27%. Parameters such as Feed Conversion Ratio (FCR), Specific Growth Rate (SGR), and weight gain were evaluated while feeding Labeo rohita fingerlings with the Cassia tora leaf meal-based diets. The results demonstrated that the performance of the fish was influenced by the concentration of Cassia tora leaf meal in their diet, with FCR values fluctuating with varying levels of inclusion. Notably, the study revealed that as the inclusion level of Cassia tora leaf meal increased, the overall performance of the fingerlings decreased. Specifically, the supplementation of Cassia tora leaf meal at 50% and 75% in the diet positively impacted the growth and survivability of Rohu fish. The research also highlighted a significant increase in size, weight gain, and growth from the beginning to the end of the study. This suggests that incorporating Cassia tora leaves as a partial replacement for fishmeal can be economically advantageous for fish farmers and the aquaculture industry, offering a sustainable and cost-effective solution to their protein needs.