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How to Find Out if Your Guppy Is Pregnant. Guppies are beautiful, interesting fish. They are one of the few species of fish that reproduce by internal fertilization, rather than the males just fertilizing the eggs. If you have a mixture of...


How to Tell if a Guppy is Pregnant You can tell whether a female fish is pregnant or not, just by looking at it. A pregnant female will have a dark mark on her abdomen, near the anal vent. The mark is called a gravid spot. It becomes darker when the eggs are fertilized. It is an easily noticeable sign of pregnancy.


Hopefully these photos will help others to determine how far along their pregnant guppy is and when she might be due. It is important to remember that guppies can be pregnant for a range of time, usually lasting around one month (22 to 31 days gestation). I brought my female fancy guppy, Bridget, home on June 21, 2014.


The only way to tell is to watch her belly. If she's pregnant, then over time, it will start to bulge in a rather obvious way. Generally, there are no behavioral changes to expect until she's about to give birth, and she'll go about her guppy business as usual (though she might be a little impatient with males who show too much interest, but they usually won't bother a pregnant fem...


How to Identify Pregnant Guppies. The easiest way to tell if a guppy is pregnant is to look for a dark spot under her tail toward the backside of the stomach. This dark spot is called a gravid patch and as the babies grow, this guppy gravid spot will increase in size while also becoming darker.


The most common answer is if she has been in contact with a male guppy (and is old enough), she is most likely pregnant or soon will be. The easiest way to tell is that you will notice her abdomen swelling, growing larger and larger.


If you don't want pregnant fish don't get females because if you get them from a store where they put males with females 9 out of 10 times the females will be pregnant when you get them. But the most clear sign of pregnancy would be the gravid spot on the females. This is the sack where the fry grow. It just looks like a dot above where they poop.


Guppies always breed. If you have both sexes together, expect constant fry being born (even if they may get eaten). It usually takes new guppies in a tank a day or two to start breeding. Female guppies' gravid spots get very drk when they are [regnant.