Fish aren't known for showing affection. Most fish do not want to be touched by humans at all. But Bon Shaw has a Blood Parrot Cichlid that craves human interaction. That fish really loves being petted!
This little guy just loves to watch me wherever I am in the room, he'll do anything to get my attention. And when I look at him he flares out his gills and dances from side to side just hoping that I'll come over to play. If I drop food in the aquarium he'll ignore it and hope to play. I have to walk away to get him to go find the food which has floated away by then. That said, in another tank I have a second Blood Parrot Cichlid that loves me but doesn't want to be touched. It's like having one dog and one cat. You just have to love the differences.
-via Tastefully Offensive