Mogurnda, the mogurndas or Australian trout gudgeons, are freshwater sleeper gobies in the family Eleotridae, native to Australia, New Guinea, and nearby parts of Indonesia. They are stocky, big-headed ambush predators with a rounded tail and a mottled, camouflaged pattern, sitting motionless on the substrate before lunging at small prey; most guard their eggs on a hard surface after spawning, a trait typical of the family. The atlas covers 25 species, spanning roughly 2–7.5 in, from lowland rivers to isolated desert springs.
Several Mogurnda are prized by native-fish keepers, especially in Australia, for their bold personalities and attractive patterning; the northern trout gudgeon (M. mogurnda) and southern purplespotted gudgeon (M. adspersa) are the most familiar in the hobby. But the genus carries a heavier conservation burden than most: the atlas's tally includes several species ranked endangered or critically endangered. Many of the most threatened, such as the Dalhousie mogurnda (M. thermophila) and Flinders Ranges gudgeon (M. clivicola), are relict populations confined to a single isolated spring or short desert watercourse, leaving them acutely vulnerable to any change in water level or quality.