Apparently, if they catch sight of their reflection gawping back at them, they try to fight it. They are then terrified when their lookalike fights back in exactly the same way.
Scientists say the discovery shows how similar their brains are to ours.
Biologist Dr Julie, who led the study, said: 'I think this indicates there is more going on cognitively than people have long assumed in fish.'
All showed high levels of testosterone and other aggression-inducing hormones in their blood.
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