Don’t mess with a frustrated fish

Annoyed little trout fight, and sometimes fend off, bigger fish

By Stephen Ornes, 09:08 AM May 6, 2014

Researchers have found a way to unleash the fury of a rainbow trout: Withhold a treat. In recent experiments, when these fish didn't get the snack they expected, they turned feisty — and got into violent fights.

The snack in question was a bit of shrimp. And when small trout were denied the shrimp, they became willing to fight bigger fish, ones they normally would have fled, reports Marco Vindas. A biologist at the University of Oslo in Norway, his team showed that in two of 11 cases, small fi...

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