The Mary River flows into the Great Sandy Strait, near wetlands of international significance recognised by the International agreement of the Ramsar Convention and Fraser Island World Heritage Area, which attracts thousands of visitors every year.
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There was strong opposition to the dam from the wider and international community based on environmental concerns related to the endangered Mary River Cod, Mary River Turtle, Giant Barred Frog, Cascade Tree Frog, Coxen's Fig Parrot, the vulnerable Queensland lungfish, Tusked Frog, Honey Blue-eyed Fish, the Richmond Birdwing butterfly and the Illidge's Ant-blue Butterfly.
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The independent expert Associate Professor Keith Walker says that the mitigation and offset strategies such as the Freshwater Species Conservation Centre were inadequate, risky and ill-defined and that the proposed fish and turtle ladders were unproven.
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