Effective valorization of bio-processed castor kernel meal based fish feed supplements concomitant with oil extraction processing industry: A prolific way towards greening of landscaping/environment

Abstract The prime demand for expansion of feed-based aquaculture is the quest for new protein-rich ingredients to accomplish the global food and nutritional securities. Simultaneously, consistent production of agro-industrial wastes and their disposal is a major issue, although, the better nutritional profile of these wastes fostering a way forward to valorize in animal/fish feed. The present study was proposed to ensure the valorization of the castor oil industry’s residues i.e. castor cake or meal by standardizing the process for the preparation of protein isolate with the help of iso-electric precipitation method and subsequently utilizing them in fish feed. Maximum recoveries and protein content (P 75 diets whereas, minimum in CPI100 fed group. Dietary CPI did not affect the body indices, survival and body composition in rohu fingerlings. Based on the results, it can be concluded that castor protein isolate would be a valuable protein-rich ingredient for fish feed and 75% substitution of soy protein isolate with castor protein isolate could be possible without any harmful effects on growth, feed conversion, nutrient utilization and survival.