The study looked at how profitable it is to raise different types of fish together in East Siang district, Arunachal Pradesh. They stocked six types of fish in specific ratios and followed recommended practices. The fish grew well, with an average productivity of around 20 quintals per location. The total cost of production per hectare was Rs. 1,46,667. Overall, the benefit-cost ratio was 2.16, showing that composite fish culture can be a profitable business when managed properly.