The Anglesea River following the flocculation event.

Anglesea River turns a different shade of blue

August 8, 2019 BY

THE Anglesea River has changed colour to a milky blue due to a process known as flocculation.

The river’s water has long been subject to spikes in acidity when acid from natural sources in its catchment flow into the river following high rainfall.

When the river mouth is open and the acidic river water mixes, sea water flocculation occurs. This sees fine metal particles start coming together in the water and reflecting light, which in turn changes the waters colour.

If the water becomes too acidic it can threaten the fish living in the river.

In 2014, the river’s acidity reached worrying levels, but an expert panel concluded that artificially opening the river mouth would not be beneficial to the health of the river and its wildlife.

Both the Surf Coast Shire Council and the Corangamite Catchment Management Authority will continue to monitor the estuary’s water quality and keep the community informed.

If you see large numbers of fish, crustaceans or eels that are dead or appear to be struggling, contact the Environment Protection Authority on 1300 372 842.