How?

[Rillan]

Apart from getting fat how can i tell if my female guppy is pregnant?

 

[*Fishkies*]

There will be a black gravid spot behind her stomach.

 

[kpintheshed]

if theres a gravid spot (black blob), behind the ribs.

 

[Rillan]

Cheers people! How long are they usually pregnant for???

 

[mommyof2bettas]

You can tell if the gravid spot is really dark.
You can see her getting fatter after 2 weeks of pregnancy, so if you start seeing the signs, they are probably going to drop in about 2 weeks.

 

[theotheragentm]

Total pregnancy length is about 4 weeks. You'll see the signs about half way through. Guppies have the most pronounced gravid spots in common livebearers. So by the time you notice, it'll be about two weeks. After she births, expect another batch in another 4 weeks.

 

[kribensis12]

Gravid spots are a good indicater.