Are my guppies pregnant?

bump, I have the same. my female guppies a have a dark spot like that but ive only had them 3 days, they're not that big.

It is possible that they simply have lots of food in their gut. However, their is a very good chance that they are pregnant. Adult female guppies pretty much live perpetually pregnant. All it takes is a few moments with one male to keep them pregnant for months.

That being said, she may or may not give birth. If she dose not like the water conditions or is stressed in someway she will re-dissolve the young or "drop" them early. If you want to keep fry provide lots of space of them to hide and/or remove them from the main tank after they are born. If you do not want the young, do nothing. Many will be eaten. Few if any will grow up.

She will get much bigger before sh egives brith, but you may not want to move her, it stresses the mother. It can eve cause her to drop the young early.

They could just be full of food, mine always looks like that, its when they get fat that you will know

I'm by no means an expert on guppies or any other fish, but my advice from our experience w/ guppies is this: if the females have a large gravid spot, they're almost certainly pregnant; actually if they're females at all they're almost certainly pregnant. If you look closely and see little black dots in her gravid spot, she's definitely pregnant (those are the developing fry's eyes). I would go ahead and put them in the smaller tank, not because the fry will be eaten, but because it's much easier to move one big momma guppy after the fry are dropped than it is to chase and catch a bunch of tiny fry in a big tank. Trust me on this. lol

BTW none of our fish ate fry. We were short on plants at the time so I got a bunch of something to float at the top. It was totally unnecessary. No one paid the fry the slightest bit of attention, even when they came boldly to the top of the tank to feed alongside the other fish (yikes!). Then in a few weeks, the fry started having fry. Soon our entire tank was overrun with guppy and their generations of fry. The tank became very overstocked and catching the guppies for transport to the local fish store was a pain. So moving them to the smaller tank before they drop fry imo is a very good idea.

Sounds like you have a great fry set-up. good luck.

It looks like she's pregnant to me, and those dots are indeed another clue, but I'd say she has a week and half maybe 2 weeks. I had one that looked very similar to yours and her gravid spot grew upwards starting to head up her back before she gave birth.

Very much like Jessica, my adult guppies had no interest in eating the fry. It was my zebra danios that did them in. Even so, after a few days, they just ignored them as well. And at one point, I had one birth 58 (warning, she was the one that looked like yours!) and 2 days later, another 74, and had easily over 100 that no adult was interested in eating.

I also found that my females would swim up and down along the walls constantly for hours before they were about to give birth. You might want to watch for that too.

Let us know when the happy moment comes. And if you need to get rid of some, send me a private message. I've had a scourge almost kill out all my guppies and I'll be looking for more once I cure my tanks (and I'm also in NJ).

Good luck.