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Recent studies have investigated demand feeders to determine optimal fish self-selection of feed based on feed nutrients (Fortes-Silva et al., 2017) and to improve the activity of digestive enzymes through self-feeding (Reis et al., 2019). However, only a few studies have compared the growth rates of fish fed using demand feeders and other feeding systems.Demand feeders are expected to show improved growth in fish and decrease feed loss; however, several issues hinder fish growth.For example, fish show social status and dominance hierarchies that disrupt the growth of individual fish. Moreover, a fish or a few fish may dominate the activation of the switch and monopolize the feeding area, resulting in different growth rates among the fish in a tank

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