The Isaac River system is located in the Mackenzie River sub-catchment of the larger Fitzroy River Basin in Central Queensland. Grosvenor Creek is a tributary of the Isaac River and runs through the township of Moranbah. Grosvenor Creek encompasses an ephemeral stream channel, smaller feeder creeks as well as a large number of natural and man-made offstream lagoons and dams. In recent years there have been confirmed reports of the presence of the noxious tilapia species Oreochromus mossambicus (referred to herein as tilapia) at a number of locations around Moranbah, however, the extent of the species’ distribution in this area had yet to be determined. Read more..