My Zebra Danio just started to act this way today and he was big before but not this big, now tonight there is definatly something wrong and she is swiming kinda cocked like on her side but not quite....
Wow.. serious bloating. Danios are egg layers so.. definitely not pregnant. Even if she was full of eggs, she wouldn't be that bloated.
Sounds like she may be constipated. Don't feed your fish for a few days and then try feeding a small amount of a cooked shelled pea.
Thanks everyone for your help. I treated it as if she was constipated but over night she died. It was quite severe because she got worse right in front of your eyes so I was pretty much helpless.