For example, localized extinction of the Trout Cod, Murray Cod and Macquarie Perch has occurred Km downstream following completion of the Dartmouth Dam, the last major dam built in the basin.


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Removing 'snags' fallen trees and branches from the watercourse also reduces the habitat quality and breeding success of native fish while increasing the competitive advantage of invasives. Carp also spawn in the many vegetated irrigation channel systems in the Murray-Darling River system.


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    8. An aquarium fish that was introduced in the 's to prey on mosquitoes as it did in the Rio Grande, this species has had no impact on mosquito prevalence, but attacks, injures and preys on native fish. It nips the fins of other fish, leaving open sores which spread pathogens among fish, and competes with them for food and habitat. The Mosquito Fish also feeds on native fish fry at the water's surface and preys on the eggs and attacks the tadpoles of native frogs.

    Speaking of aquarium fish released into the Murray-Darling, this is now the largest source of new feral freshwater fish in Australia. Since , the number of exotic fish in Australia's waters overall jumped from 22 to 34, and all except for one of these introduced species originated from the aquarium trade. Compounding damage to the Murray-Darling, are invasive plants including water plants released from aquariums and ponds, riparian trees introduced for aesthetic purposes, and a variety of plants introduced for agricultural and ornamental purposes that are invading floodplains and other wetlands.

    Murray-Darling taken off endangered listing to cut 'green tape' | Environment | The Guardian

    The Australian Action Plan for Birds identifies 24 birds on the brink of being considered nationally threatened, and 14 that are already threatened. Most temperate woodland habitat has been cleared, including 85 per cent of box-ironbark forests in Victoria and over 70 per cent in New South Wales. Almost all the better quality agricultural land has been cleared, which is of particular consequence for migratory species such as the Regent Honeyeater and Swift Parrot.


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      4. Remaining woodland habitat is fragmented and inferior habitat on poorer soils. It continues to be degraded by removal of living and dead timber, which provides essential habitat requirements for most bird species, and there is an ongoing decline in tree health, as seen in areas of trees suffering dieback.

      Factors such as salinisation, over-grazing and weed invasion gradually make the remaining fragments unsuitable for birds. Within fragments, essential habitat features that may be lost are leaf litter and sticks and their associated invertebrates, hollows suitable for nesting by cockatoos, parrots, owls and treecreepers and key food plants.

      Nationally Threatened Birds of the Murray Darling Basin

      Learn about why the Murray—Darling Basin is so important to Australia. Catchments Discover more about the Basin in your region by exploring the catchments in the Basin. Environment The Basin contains diverse ecosystems and a wide variety of plants and animals. Landscape Learn more about the Basin's landscape and diverse, complex environment. Water The Basin's water is important for social and economic purposes and a healthy environment. Basin Plan roll-out The Basin Plan The aim of the Basin Plan is to ensure that water is shared between all users, including the environment, in a sustainable way.

      Sustainable diversion limits The Basin Plan sets a limit on how much water can be sustainably diverted within the Basin.

      Why is fauna important?

      Compliance and enforcement Compliance is an integral part of water management in the Murray—Darling Basin. Monitoring and evaluation Monitoring, evaluation and reporting is critical to understanding whether the Basin Plan is working and on track. Water recovery Water recovery is the water that is being recovered for the environment. Northern Basin projects The northern Basin is a complex network of people and places, industries and organisations with many and varied needs.

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      Climate variability and change Water management must be adaptive to the uncertain effects of climate variability and change. Groundwater We work together with the states to manage the Basin's groundwater resources.

      Managing water Water for the environment Ensuring that water quality is maintained and rivers and wetlands are restored to health. Water markets and trade Trade is vital for irrigators by allowing flexibility in response to water availability. Water quality Maintaining water quality is crucial to sustaining human life and a healthy, working Basin.