Wow! Interesting...I never really thought about it lol
I don't really know lol. When they breath, bubbles go out. How would we know if they're farting or breathing?
Fish do fart however it is not in the mammalian sense there bubbles of methane/other gases are contained in their excrement and not regularly released.
I had a black moore that pooped out a long string of crap, about 3inches long. It had a bubble in the string that made it float up. I guess you could call that a fart...
no they do not they do not breath air like us and air is not trapped in them, but if its a lungfish or an air breathing fish im not sure but i have never seen a fish fart so they definately don't FACT and if you believe they do you are very dumb looool.