It’s not a Hollywood B movie, but a real event. Over 70 people have been injured after they were attacked while swimming in a river in Rosario, Argentina. 
The fish responsible are related to piranha, and the bites were so severe that some people lost entire digits.
The fish – palometas – are large and have huge teeth. The one shown here is quite small considering the size they can actually grow to.
According to various stories, people were back in the water within half an hour of the attacks. Argentina is currently in the middle of a a heat wave and they were anxious to cool off. Mind you, it looks like they didn’t go all the way back in!
You can see some of the injuries on the video feed in that BBC story link. They’re pretty nasty.
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