Abstract:Pellet feed loss is a major concern in sea cage culture. Underwater camera connected to a TV recording system for estimating pellet feed loss was employed in the tank experiments of cobia Rachycentron canadum. The results showed that fish in camera-monitored tank gave better control and a lower rate of pellet loss. The average improvement was approximately 10%. It is also concluded that subsurface-feeding activities is a better indicator of satiety in cobia culture.