Widespread flooding across the southern Murray-Darling Basin in 2010–11 led to a "hypoxic blackwater" event. This is where leaf litter and debris from the floodplain wash into the river ...

Ray De Groot from OzFish has been part of efforts to nurse flood-affected freshwater crayfish and native fish back to health, and return them to the Murray River Source: AAP / SUPPLIED/PR IMAGE ...