Scientists in Zimbabwe say a freshwater crayfish introduced from Australia is breeding out of control in the northern Lake Kariba, devouring the food sources of other fish and putting the nation's entire aquatic ecosystem at risk.
Officials at the Zimbabwe University lake shore research station say the red claw crayfish, introduced a decade ago for a fish farming project, has no natural predators in the wild - crocodiles don't like them - and they produce clusters of eggs up to half the
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