Yes, I this this to a degree in my fish. I would refer to it as individual traits and tendencies rather than personality (person more or less equating with human), but maybe that's just semantics.

I definatly see personalities in fish. Some are just more sociable then others. Sometimes it is because of the amount of fish, like Clown Loaches. If you only get one, they are shy and hide, but once it has another or more of its own they are way more active and freindly. But I have had fish, same numbers, same species, same other non-species tank mates and they just are more curious and fearless. I guess that would be considered a personality trait. Doesn't really matter, it is what you make of it. So why not make it fun.

I think they have personalities. Though, the amount that they "interact" with people probably depends on the species of fish as well.

One of my koi is very skittish, startles easily. She's sort of getting over this a bit, but still at times.

One of my small fantail goldfish seems to prefer being on his own alot. He's always been like that.

I know alot of their behavior is food related. That is, they see you and equate you with feeding time, but it's interesting to observe their behavior, each seems to have their own personality.

Food, surroundings and companionship affect humans personalities as well as animals. I guess people are affraid to relate the word personality with animals because of the "person" part of the word that is defined as a Human being. But personality is defined as individualism. Thats my version anyway LOL.

I think my african butterfly fish has the most "personality". I've trained him to come to me if I take out his prey poking stick.

He also kind of lords it over the other fish in the tank, very regal.

Oh yes. I just lost my little Harpie (3years old) She was always delicate and had her own tank next to Vash and Guiness. Vash is about 10 years old. Guiness 3. Vash always seemed to love Harpie and somtimes I would put him in her tank for a little while. After she died He apeared to be very concerned. (he couldn't see her in the tank next door) Vash comunicates with looks and body language. My husband thinks I'm nuts.

I have a large betta girl, she gets very excited when she see me approach her 2-1/2 gallon tank. I will look at her, and then she will look upwards to the surface, looking for food, like "well, where is my food"?... lol