Guppies (Poecilia reticulata) room a fascinating fish breed. This freshwater tropical fish originates in South America.

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They are reasonably easy to treatment for and are suitable for those new to aquarium keeping.

Commercially, friend can find them in a vast array that colors and also sizes, offering them one of their typical nicknames: the rainbow fish.

They space live-bearing fish, definition they provide birth come fully-formed, free-swimming young.

One point to know when keeping guppies is the they room prolific breeders and are qualified of bearing up to 2,000 young in the life time of a single female.

This capability has offered the guppy one more one of its usual names: the millions fish.

Knowing just how to determine male versus female guppies is the very first step.

Read ~ above for more information on exactly how to understand if your guppy is pregnant, exactly how to prepare for the birth, and how to treatment for the infant guppies.

Guppy Biology

The average range of fry per birth is from 30 to 60

As us said, guppies space extremely abundant fish and can breed when they room as young as one month old!

Guppies’ gender creates at four weeks. At six weeks, they space sexually active. The average period for an initial breeding is between three to 5 months.

Chances are if you have actually a male and female guppy in her tank, you have a pregnant female!

Pregnant female guppy (source)

Knowing i m sorry fish room male and also which space female is important.

Look under her guppy’s tail, towards the back component of the stomach, and also near the anal fin for a dark spot, additionally known as the gravid patch. These fish are your females.

Keep the males and also females separate until girlfriend are ready to breed them come maintain populace control.

A female guppy can store sperm from one insemination for as much as a year and also can come to be pregnant approximately eight times from that solitary event!

In fact, a mrs guppy can end up being pregnant again a mere couple of hours after having just given birth!

While the average number of fry every birth is 30 to 60, her female can provide birth to as countless as 200 fry from one pregnancy.

Guppy reproduction Behavior

Guppies’ female at the bottom and male (source)

The male guppy will certainly chase the female approximately the tank. When he is close enough, that will quickly extend his gonopodium, a long, small adaptation come the anal fin.

He will pass a sperm packet to the female’s anal vent, located simply behind the gravid spot.

Mating is quick and also may take place multiple times to ensure insemination.

You might mistake the quick activity as aggression at first, but once friend are acquainted with it, friend will recognize it as mating behavior.

Guppy Gestation Period

The gestation period for female guppies is typically less 보다 one month but can variety from 21 to 31 days.

Once you notification that your female guppy is pregnant, eliminate her from the neighborhood tank come a separate breeding tank.

Identifying your Pregnant Guppy

Boxy-shaped female (source)

To determine whether your female guppy is pregnant, watch for transforms in the gravid spot. It will become darker and also larger as the babies grow.

Your guppy will grow in girth considerably and may appear “boxy” shaped. Her color may fade.

Once she is fairly close to offering birth, her gravid spot will show up black. You may even have the ability to see the eyes of the fry v your female’s belly wall.


Other indications that your woman is well along in her pregnancy are changes in her behavior.

You may notification your mrs guppy is no as active, tending to stay in one location. She may likewise become shy or much more aggressive.

She could eat whatever in vision or beside nothing. When it is nearby to her time to provide birth, she may look like she is pushing and also may have actually an arch to her back.

She may additionally have difficulty swimming and may breath rapidly.

Maintaining the Tank


In the best practice, collection up 2 tanks: one because that the fried food to be born in and another to let mother recover in because that one to two days prior to you return her to the community tank.

A ten-gallon tank is a good size for your reproduction tank.

Water Parameters

Maintain the water pH range between 7.0 and 7.6 and clean the tanks regularly.

You want to control any type of algae or rubbish buildup that can impact the health and wellness of your fish. Adjust 25% the the water every week.

Install a sponge filter to save the water clean. The water hardness have to be native 7 come 12 dGH.

Raise the water temperature in the tank to in between 77 and also 79°F (25 come 26°C) to encourage a organic gestation progression and assist the bear along.

Take care to screen the water temperature, together fluctuations deserve to stress your female and influence the possibilities of a successful birth.


The guppy fry need from 8 to 12 hrs of light per day for healthy development. Use a tool tank light, LED, or ambient room lighting.

Setting the light on a timer will assist keep a continuous schedule. Adding a dimmer have the right to simulate sunrise and also sunset problems to diminish the anxiety to her fish.

Keep the fry Separate

Keeping the fry different from the ar tank and the mommy is important, together the mature fish may eat the fry.

While a different tank is easiest, there space mesh piece you can purchase to hang either in the birthing tank or ar tank to keep the fry safe. Mesh net boxes are also an option.

In addition, having some dense, planted areas will provide the fry locations to hide. Both artificial and natural aquarium plants will serve this purpose.

Feeding your Pregnant Guppy


The more along her guppy is in her pregnancy, the much less she will most likely eat. Offer her several small meals each day, and then just a small bit.

You carry out not want leftover fish food floating around, so she should be able to finish what you offer her in 5 minutes.

Nutrition is essential for a healthy mom and also babies. In enhancement to a an excellent quality flake food, think about supplementing through the adhering to live or frozen foods:

Brine shrimp (fresh or frozen) Spirulina flakes Mosquito larvae Daphnia Vegetables, such as lettuce, peas, or zucchini

The actual Birth

A common birth deserve to take all over from two to 6 hours. Occasionally, the procedure can start and also stop or can prolong over a longer period. In this cases, the fry might not be viable.

If the birthing procedure has stopped, return the female come the community tank for a job or so as isolation will stress your fish.

When they space born, the guppy fry space curled into small balls. Healthy and balanced fry will uncurl and begin swim quickly.

If you observe any type of unhealthy or stillborn fry sinking come the bottom, remove them native the tank as shortly as possible.

After her Guppy offers Birth

One mainly old fried food (source)

After her female provides birth, separate her native the fry, either with the usage of a mesh or another tank. This is necessary as she may eat the fry, search the nourishment she needs to recover.

Isolate she for one to 2 days. During this time, feed her well and regularly.

A selection of high-quality, high-nutrient foods will permit her to restore nutrients shed in the birthing process.

Do not different her for longer than this time as the isolation can more stress your fish.

After returning her to the community tank, remember the a mrs can end up being pregnant multiple times from a single insemination. Save an eye on her since she may be ready to provide birth again in another 21 to 31 days.

Fry Care and also Feeding

Your child fry will require very small-sized food in ~ first. Feeding them often, up to 5 times a day.

Excellent foods items to feeding your fry include:

Pulverized flakes infant brine shrimp

Guppy adults are from 0.6 come 2.4 inches in length. The fry are about ¼ in length once they are born and also grow approximately 0.3 inches every month.

Keep the fry different until castle are around one-half inch in length. Climate you have the right to introduce them to the neighborhood tank.

Final Thoughts

Knowing a small about guppy biology and reproductive behavior will go a long way toward keeping your fish happy and also healthy.

If you plan on simply maintaining guppies for their look, then consider keeping a team of males only.

You will reap the beautiful coloration the the males and also not need to worry about any guppy fry.

If you do arrangement on breeding them, learn how to treatment for her pregnant mrs guppy throughout her pregnant properly.

Preparing a separate tank or area for the fry to be born will defend them.

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Feeding the fry a mix the nutrient-rich foods and also maintaining water quality and also conditions will aid ensure the your fry reach maturity and also can be introduced right into the community tank.