The dark sleeper, Odontobutis obscura, is a species of freshwater sleeper native to Japan, and Korea (only Geoje Island).

[1] This species is also variously called Toadonn, Toadfish, and Toadle.

The Dark sleeper diet mainly consists of zoobenthos: chironomids, small aquatic bugs and larvae, which are all found in the benthic zone of the water column.

Eels that were completely inside the stomach constantly circled in it, as if searching for an exit.

This order Gobiiformes (goby) related article is a stub.