The fly-specked hardyhead (Craterocephalus stercusmuscarum) is a species of fish in the family Atherinidae endemic and widespread in the freshwater streams of the Northern Territory down the east coast of Queensland into southern Queensland.

[3][4] The Australian Museum has a sample taken from the Annan River[1] in its ichthyology collection.

The Museum describes the species as follows:[4] "The flyspecked hardyhead has a slender body covered with black dots.

"The flyspecked hardyhead eats mainly mosquito larvae and aquatic insects.

Females deposit large, transparent eggs onto aquatic plants.