The sleepy cod (Oxyeleotris lineolata) is a medium-sized fish in the family Butidae, native to tropical fresh waters of northern Australia and questionably from New Guinea.

They are one of the most favoured freshwater fish in Australia for eating, having white, flaky flesh, low fat content, and a mild flavour.

[2] Females spawn in the benthic zone from October to February.

Males guard nests of up to 70,000 eggs until larvae hatch, usually after 5–7 days.

They are usually found in quiet or slow-flowing water in freshwater rivers, creeks, and billabongs throughout northern Australia.