Pregnant guppy won't give birth!

The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.


Aquarium Advice Newbie
Jun 15, 2023
It's crazy how long this guppy has been pregnant for it has to be at least 3 months now she keeps getting bigger yet don't see any dark spot near her anus area like I keep hearing is a sign of being ready to give birth also she's not really getting that squared off look I've been seeing. She is pregnant right I'm not crazy? I was worried it could be bloating but it's been to long for that too of it was bloating she should be dead by now I think but she seems over all healthy she's fast has big appetite what do I do.. my water is clear and warm my pH is good I don't see any obvious signs of stress or anything she should be stressed about. This is my first time dealing with pregnant guppies by the way so if there's something obvious I'm missing let me know I wouldn't be surprised haha thanks for reading I'm going attach some pics below she's a goofy looking thing anyway


  • IMG_3767.jpeg
    87.7 KB · Views: 27
  • IMG_3763.jpg
    209 KB · Views: 29
  • IMG_3759.jpg
    264 KB · Views: 34
  • IMG_3765.jpeg
    102.9 KB · Views: 33
The fish in the pictures is a balloon molly and they are mutated to such a degree their bodies are much shorter than they should be. This causes their internal organs to get squished up and the fish look overly fat.

The fish could also have intestinal worms and most common livebearers coming out of Asian fish farms do.


Intestinal Worms like tapeworm and threadworms cause the fish to lose weight, continue eating and swimming normally, and do a stringy white poop. Fish can do this for months and not be too badly affected. In some cases, fish with a bad worm infestation will actually gain weight and get fat and look like a pregnant guppy. This is due to the huge number of worms inside the fish.

Livebearers like guppies, mollies, swordtails & platies are regularly infected with gill flukes and intestinal worms.

You can use Praziquantel to treat tapeworm and gill flukes. And use Levamisole to treat thread/ round worms. If you can't find these medications, look for Flubendazole, which treats both lots of worms.

In the UK look for:
eSHa gdex contains praziquantel that treats tapeworm and gill flukes.
eSHa-ndx contains levamisole and treats thread/ round worms.
NT Labs Anti-fluke and Wormer contains flubendazole.
Kusuri wormer plus (contains flubendazole) - sold mainly for discus, comes as a powder which is quite hard to dose in smaller tanks
Sera nematol (contains emamectin)

Remove carbon from filters before treatment and increase aeration/ surface turbulence to maximise oxygen levels in the water.

You treat the fish once a week for 4 weeks. The first treatment will kill any worms in the fish. The second, third and forth treatments kill any baby worms that hatch from eggs inside the fish's digestive tract.

Treat every fish tank in the house at the same time to prevent cross contamination.

You do a 75% water change and complete gravel clean 24-48 hours after treatment. Clean the filter 24 hours after treatment too.

Do not use the 2 medications together. If you want to treat both medications in a short space of time, use Praziquantel on day one. Do a 75% water change and gravel clean the substrate on day 2 & 3. Treat the tank with Levamisole on day 4 and do a 75% water change and gravel clean on day 5, 6 & 7 and then start with Praziquantel again on day 8.

The water changes will remove most of the medication so you don't overdose the fish the next time you treat them. The gravel cleaning will suck out any worms and eggs that have been expelled by the fish. Repeating the treatment for 3-4 doses at weekly intervals will kill any worms that hatch from eggs. At the end of the treatment you will have healthier fish.
Top Bottom