How Big Do Guppies Get? – By Petsbent

Most Of the time guppies lovers ask How Big Do Guppies Get? So we answered them that Guppies are little, unassuming fish with a large following in the aquarium hobby. While their popularity may be attributed to their laid-back demeanour, appearance has always been a priority.

After a lot of research on keeping a lot of guppies in tanks for many years, our team has gathered a lot of data about How Big Do Guppies Get? I’ll tell you all you need to know about the size of a guppy in this blog. Let’s start with the question of how large guppies grow.

What is the maximum size of a guppie?

Guppy males are about 1.5-3.5 cm (1.6-1.4 in) long, whereas females are typically 3-6 cm (1.2-2.4 in). A male’s average body weight is 0.07 0.1 g, whereas a female’s average body weight is 0.13 0.1 g. Finally, the average height is 9mm. The typical lifespan of a guppy is two years. As a result, guppies grow to their maximum size fast.

Breeders create a wide range of strains that are distinguished by their patterns, colours, forms, and sizes via selective breeding. Guppies with larger fins and tails, for example, are known to exist. As a result, such variables play a considerable part in determining the size of a guppy. The enigma of guppies’ size does not stop here. Let’s take a closer look at their sizes at different periods of life.

What Is the Maximum Size of Guppy Fry?

Guppy fry is roughly 14 inches long when they are born. They learn to swim as soon as they are born, and they quickly learn to conceal. Because guppies consume their own young, you must guarantee that they are safe from the start. A divider and a breeding tank may be used to provide a safe environment for guppy fry.

What Size Do Juvenile Guppies Grow To Be?

One month after birth, guppy fry reaches the juvenile stage. A young guppy may reach a length of 34 inches. Naturally, female guppies will grow to be somewhat larger than male guppies. You’ll be able to differentiate a male from a female by this stage owing to the dramatic colour differences.

What is the maximum size of an adult guppie?

Female mature guppies are typically 3-6 inches long, whereas males are 1.5-3.5 inches long, as we previously said. Guppies achieve full maturity around the age of six months. You’ll have to separate men and females if you don’t want them to reproduce. Guppies, on the other hand, lose a lot of their fertility at the end of their lives.

Why haven’t my guppies gotten any bigger?

Guppies don’t always reach their full potential. It might be the result of incorrect tank size and water conditions, poor food, or even heredity. Many times, the causes are just beginner errors. You must investigate the reasons for stunted development and take the appropriate precautions to avoid it.

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Insufficient or excessive aquarium space

Guppies like swimming vigorously throughout the day, regardless of their life stage, and especially more so in the developing period. They aren’t getting enough exercise if they aren’t swimming enough. A guppy’s health and size are both affected by lack of activity.

Too much tank space, on the other hand, might backfire. Because of the large water volume, it is more difficult for fry and juvenile guppy to locate food. They’ll spend a lot of time swimming about and looking for food. That energy will be directed into development if you supply precisely the appropriate amount of tank space.

Changes Due To A Lack Of Water

A broken water parameter is another challenging reason why your guppies aren’t developing. A guppy’s health is severely harmed by factors such as extreme temperature, low oxygen levels, and an increase in toxic gas, all of which stymie the growing process.

The need for regular water changes cannot be overstated, since they are the most efficient method of removing waste and contaminants.

Nutritional Deficit

Guppies eat a variety of foods and enjoy a full supper. For proper development, they need a well-balanced diet that includes both dry and live items. Calcium and phosphorus, as well as traces of magnesium, salt, and iodine, should be included in their diet. Guppies may absorb calcium and phosphorus via their gills since they dwell in brackish water. That, however, will not suffice.


The size of a guppy is mostly determined by genetics. Depending on the strain created by breeders via selective breeding, the size might be large or tiny. In such instances, no matter what you do, you won’t be able to move the needle much. Genetics influences not just size but also other distinguishing characteristics like patterns, colours, and form.

So, if your guppy hasn’t attained the desired size after reaching the 6-month mark, you should talk to the vendor about it. Guppies with a bent spine have a hereditary issue that prevents them from growing properly. Here’s our fast guide if you want to learn more.

How Can I Help My Guppy Grow Faster?

There is no secret technique for accelerating the development of a guppy or fry. For example, you must provide a protein-rich meal, keep the fry separated, maintain adequate water conditions, and provide enough tank space. They are growing as a result of a number of underlying issues.

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Enough Tank Space

A large tank gives a guppy lots of area to graze, swim, court, and explore, encouraging a healthy and happy existence. As a result, their development is stimulated quite fast. Guppies, on average, need at least 2 gallons of water each day, although they sometimes require more. Half a gallon of water per fry should be plenty.

A guppy tank is prone to overcrowding, which is the leading cause of insufficient aquarium capacity. Aside from that, if you have too many objects in your tank, such as unpruned plants or showpieces, you should get rid of them.

Feed A Well-Balanced Meal

Nutritional deprivation inhibits guppy development and wreaks havoc on the immune system, leading to illnesses and abnormalities. Guppy development is influenced by their diet. As a result, adding growth-promoting minerals like calcium and nutrients to a guppy’s food is critical.

At least four times a day, guppy fry should be fed. For rapid development, you should switch to a protein-rich diet, which may be found in live foods like young brine shrimp, eels, and micro worms.

Ensure that the water parameters are optimal

When the water conditions are optimal and consistent, guppy fry develop very well. You must check that everything in the tank is in good working order, from the pH level and temperature to the oxygen level and hardiness.

Because guppy fry must be fed at least four times a day, the water is prone to becoming polluted quickly. As a result, you’ll have to replace the water more often. If you don’t, nitrates and ammonia will quickly build up, stunting development and even posing a risk of death.Every week, I suggest doing at least three minor water changes of 15-20 per cent.

Artificial Light That Is Appropriate

Appropriate lighting does more than just aid guppy vision. It promotes improved food conversion efficiency, which increases food intake. Guppies and guppy fry, on the other hand, need around 8 to 10 hours of light every day.

However, don’t go overboard with the lighting. Guppies are nocturnal animals that need sleep at night. If you expose them to too much light, they won’t be able to tell the difference between day and night, creating stress and stunting their development.

Rise The Fry Alone

Guppies engage in filial cannibalism, which involves them eating their own progeny. You’ll soon be left with no fry if you grow fry and adult guppies together. And if the fry is fortunate enough to survive, the dread of death will severely limit their development.

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A guppy eating its own progeny might be due to a variety of factors. It might be anything from stress to overcrowding to restocking their own fat reserves.

Fry Should Be Separated By Size

Separating the fry by size may seem inconvenient, but it’s necessary. Broods of various ages and sizes of fry must be separated. Otherwise, the larger fry will devour all of the food, leaving little for the smaller fry. And if your fry isn’t getting enough food, they won’t be able to develop quickly.

Larger fry is often more nimble and energetic than smaller fry. Furthermore, the presence of bigger counterparts is likely to stress smaller fry, hampering their development.


Can Guppies Eat Pellets?

How Long Do Guppies Live?

Final Verdict On How Big Do Guppies Grow?

What size guppies grow to is a relative question that is determined by their genetic strain as well as a number of other variables. Male guppies are 1.5-3.5 cm long on average, whereas female guppies are 3-6 cm long.

The typical male guppy weighs 0.07 0.1 g, whereas the average female weighs 0.13 0.1 g.

Guppies have existed as a distinct species for millions of years. As a result, their anatomy has evolved dramatically throughout time. Breeders now use selective breeding to create a variety of strains, each with its own size, pattern, colour, and form.

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