Finding Nemo may be true to life - scientists reckon fish know how to find friends and they often choose to hang out with their mates.
Marlin and Dory were fast friends in Finding Nemo
They say fish are careful who they mix with and prefer pals that come from their own "neighbourhood".
Fish even use other senses than their vision to make new friends, like their sense of smell.
The amazing study was done to help scientists understand how fish reproduce and protect their homes.
Scientists looked at fish called three-spine sticklebacks to learn how they can find each other.