Bloated Guppy

Since it is male, it is obviously not carrying fry.

Could it have swallowed something like a bit of gravel?
Or stuffed itself with food - how long has it been like this?

You could try not feeding the tank for a day then giving daphnia (live or frozen) then nothing the following day. Daphnia is good for constipation, as is fasting a couple of days.


Guppies are not the hardiest of fish these days I'm afraid.