WThe freshwater anchovy is a species of fish in the family Engraulidae. It is endemic to Australia. Often mistaken for a Minnow.
WGlossamia aprion is a species of freshwater ray-finned fish from the family Apogonidae, the cardinalfishes, from northern Australia and New Guinea. In Australia, it is commonly known as the mouth almighty.
WMogurnda mogurnda, commonly known as the northern trout gudgeon or northern purple-spotted gudgeon is a freshwater fish native to northern Australia and New Guinea.
WHypseleotris compressa, the empire gudgeon, is a species of Gobiiform fish in the family Eleotridae endemic to Australia and south-central New Guinea.
WThe threadfin rainbowfish or featherfin rainbowfish is a rainbowfish, the only species in the genus Iriatherina. It is characterized by long beautiful fins, and is among the most attractive of the rainbowfishes.
WThe northern river shark or New Guinea river shark is a species of requiem shark, in the family Carcharhinidae, found in scattered tidal rivers and associated coastal waters in northern Australia and in Papua New Guinea. This species inhabits areas with poor visibility, soft bottoms, and large tides, with immature sharks ranging into fresh and brackish water. It is similar to other river sharks in having a stocky grey body with a high back, tiny eyes, and broad fins. It measures up to 2.5 m (8.2 ft) long.
WThe speartooth shark is an extremely rare species of river shark, belonging to the family Carcharhinidae. It inhabits coastal marine waters and tidal reaches of large tropical rivers in northern Australia and New Guinea. Despite being a member of the river shark genus, it is also found in near-shore marine waters, favoring highly turbid environments over a wide range of salinities. This robustly built, gray-colored shark is characterized by a short and broad snout, tiny eyes, a relatively large second dorsal fin, and a black blotch beneath each pectoral fin near the tip. Another identifying trait is its teeth, which are large, triangular, and serrated in the upper jaw and narrow, spear-like, and serrated only near the tips in the lower jaw. Adults grow to about 2.6 m (8.5 ft) long.