Abstract: An 60-day feeding experiment was conducted to investigate the effects of partial replacement of discarded filamentous green seaweed (Cladophora) with commercial feed on the growth performance and feed efficiency of spotted scat (Scatophagus argus). Triplicate groups of fish with initial body weight of 3.31 -3.39 g were reared in the 250 L plastic tanks at salinity of 5 g L-1. Results showed that growth rate of fish in the alternate feeding regime, 1 day commercial feed and 1 consecutive day dried or fresh green seaweed were not significantly different (p>0,05) from the control group received single commercial feed.