The spotted sand-diver (Trichonotus setiger) is a perciform fish in the family Trichonotidae.

Males can be distinguished from females by their long dorsal fin rays and larger size.

[3] T. setiger can be found from the Persian Gulf to Queensland and Melanesia[4] Spotted sand-divers occur in large groups where there are steep sand slopes.

They hover above clean sandy substrates and dive into the sand when disturbed.

They are normally observed resting on sea bed, leaving substrate to catch zooplankton, or to display.