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No water quality data was collected, however, it is expected the fish deaths were a natural occurrence due to inundation of grassed areas with rotting vegetation causing low oxygen levels.
VICTORIA'S environment watchdog is investigating water quality problems in the Goulburn River, which have caused hundreds of fish to die in recent days.
Local experts believe a ''blackwater event'' has struck the Goulburn, in the wake of massive floods that have come down the river.
Blackwater is a term dating to at least the 1970s used to describe wastewater containing fecal matter and urine. It is also known as brown water, foul water, or sewage. It is distinct from greywater or sullage, the residues of washing processes.
Blackwater contains pathogens which need to decompose before they can be released safely into the environment. It is difficult to process blackwater if it contains a large quantity of excess water, or if it must be processed quickly, because of the high concentrations of organic material.