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CHERYL-SAMANTHA OWEN / NATURE PICTURE LIBRARY / SCIENCE PHOTO LIBRARY CHERYL-SAMANTHA OWEN / NATURE PICTURE LIBRARY / SCIENCE PHOTO LIBRARY
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Fish ecologists dragging a fyke net ashore during a survey of fish species, Tankwa River, Tankwa Karoo, Western Cape, South Africa, October 2013. Encouragingly, no non-native fish species were found during this survey, giving scientists hope that the Tankwa river will act as a refuge for indigenous fish.
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