Black fish dart over the submerged, ancient district, its foundations picked out pale green by the morning sun.

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Scientists drained some fish of their sperm or eggs, which were later fertilized to create hatchlings to reintroduce or support the fish in other parts of their ancient range in the Great Lakes, Hudson Bay and Mississippi basins.

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In ancient times, the Dharug Aboriginal tribe came to this part of the Hawkesbury to fish and perform ceremonies, leaving carvings on the cliff rock that can be seen from the river.

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