My guppy looks big. Is she pregnant? What are the signs to look for?

She appears to have eggs given her girth. There are also some vertical bars on her side that indicate she may be ready to spawn. If possible, check underneath for a pronounced white dot. This is further proof that she is ready to spawn.

She looks like she may be pregnant. A female platy will become quite large when pregnant. Gestation lasts about 28 days. When she's ready, she will swim to a quiet part of the tank and give birth. The fry are fully developed and able to swim. If not removed soon, they may get eaten by the mother or other fish in the tank.

If you also have a male in the tank, it is very likely that she is at the beginning of pregnancy. Keep watching her and the black spot should be getting bigger and she should be getting rounder. This is a live-bearing fish, so make sure there are a lot of plants somewhere in the tank, so the babies can hide from the parents, as they will eat them.

In most normal circumstances, the guppy birthing process takes between two and six hours, but if the mother is having difficulty, it can take up to 12 hours for all the fry to be delivered. In some cases, the mother will deliver a few fry and then stop the delivery only to resume in a few days. So, give her a bit more time and try to not stress her out.

You need only provide plenty of space, clean water and a quality flake or pelleted diet. Male goldfish will develop white dots on the fins and gills when ready to mate. He (they) may chase her around and bump her stomach to get her to spawn (lay eggs). When she is ready, she will seek out planted or quiet area of the tank and spawn. The males will then release sperm to fertilize the eggs. The eggs will need to be removed to a separate tank to prevent them from being eaten by the adults. The eggs will need to be kept at a certain temperature and in clean water until they hatch within a week's time. Afterwards, you will have MANY fish to care for and feed. This can quickly become an overwhelming task and should not be undertaken without serious forethought. You can read more about goldfish breeding here: http://thegoldfishtank.com/goldfish-care/breeding/goldfish-breeding-breed-goldfish/

Thanks for reaching out and including photos. Coeloms (abdomens) are swollen, but unable to determine if eggs. Often when it is time to spawn, the vent becomes slightly everted. An ultrasound would be the only way to truly determine if eggs are in the abdomen. Good luck.

Thanks for reaching out about your glowfish. Being gravid can produce distensions on both sides but so can coelomic fluid, an organ enlargement (liver, kidney), constipation and other problems. If having difficulty swimming, eating or isolating self, a veterinary visit is recommended. Good luck.