From Peter Pan (1953).
These mermaids are friends of Peter Pan and they are very interested in his stories. They are resentful of Wendy and try to drown her although Peter insists they were having fun. They are frightened away when they hear that Captain Hook is rowing nearby. The mermaids appear to be in their mid-teens and one of them has red hair leaving some to believe she was the inspiration for another Disney character, Ariel.
That Wendy was no fun at all.