The greatest threat facing anyone dipping their toes into a British river is getting snaggled on an old sanitary pad or discarded shopping trolley.

Angler Jeremy Wade hooked something more formidable during a fishing trip along a remote stretch of the Congo River, Africa, when he reeled in a five-foot long Goliath tigerfish.

The river, which winds through several countries, was recently subject to an extensive trawl by biologists who found a variety of different species.

What we’re seeing here is kind of evolution on steroids,” said team leader Melanie Stiassny, a fish biologist at the American Museum of Natural History.

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