News Animals

Frustrated fish get feisty

Rainbow trout fight more aggressively when they don’t get their usual treat

DON’T TEASE  Withholding a treat that a rainbow trout has come to expect can prompt what looks like a fish version of frustration. 

Ken Hammond/USDA

By Susan Milius

- More than 2 years ago

View the video

Failing to get an expected snack rouses fish to fight with extra ferocity. The change in behavior is especially marked in undersized fish facing a big, scary opponent.