To improve the health of the Werribee River, the system receives additional water through environmental flows to support ecological processes. These are delivered through a collaboration between Melbourne Water, Southern Rural Water, Western Water, and the Environmental Water Holder.
Environmental flows in the Werribee River have been used to stimulate the migration of fish species including Common Galaxias, Tupong, Short-Finned Eels, and possibly Blue-Spotted Gobies. They also push juvenile Black Bream in the upper reaches of the estuary downstream to the seagrass beds near the river mouth. These areas are important as they provide food and protection from predators.
For further information on environmental flows in the Werribee River, visit the Victorian Environmental Water Holder: