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Axolotl Growth Rate: How Fast Do Axolotl Grow?

Axolotls are a type of salamander that spends their life in water.

As a responsible pet owner, you may be concerned about how long axolotls can grow and their growth rate before buying them.

Axolotls grow quickly from the baby to the juvenile stage (up to 6 months) if you provide them with appropriate food and an ideal enclosure.

Their growth rate reduces afterward but will reach their full adult size around 18-24 months after birth.

In this article, we have highlighted some of the things you need to know about axolotl growth rate, from how fast they grow to things that can affect their growth rate.

How Fast Do Axolotl Grow?

How Fast Do Axolotl Grow
How Fast Do Axolotl Grow? | Credit: irin717 / Canva.com

The growth rate of axolotl usually varies from one axolotl to another. However, they usually experience a rapid growth from hatchling to juvenile stage.

During this period an axolotl can grow an inch per month if provided with appropriate food and ideal enclosure. 

Some axolotls can even grow to their full size in about 12-18 months.

Some male axolotls usually become sexually mature after reaching the juvenile stage, while the females become sexually mature between 12-18 months. 

The growth rate of your axolotl will depend on the ways that you take care of them. This means your axolotl will have an excellent growth rate if you feed them according to schedule with live foods.

Also read: Axolotl Size Chart

4 Factors Affect Axolotl Growth Rate

4 Factors Affect Axolotl Growth Rate
4 Factors Affect Axolotl Growth Rate | Credit: LinouchePhoto / Canva.com

Like most species, axolotls usually grow at a different rate as some will end up being small while some will be big.

However, if your axolotl has not reached 6-7 inches in 8-9 months, it is growing relatively slowly.

There are several things that can affect your axolotl growth rate, and some of them are stated below:


One of the major things that can affect the growth rate of your axolotl is genetics.

Some axolotls are naturally small in stature, while others usually grow large even if you house them in a large/small tank.

This means you will notice a change in growth rate between two axolotls even when you expose them to similar treatment.


The growth rate of an axolotl also depends on its age. For instance, a juvenile axolotl has a fast growth rate and can grow to about an inch per month under normal circumstances.

On the other hand, adult axolotls have a slow growth rate as they have completed their growth cycle.


The enclosure that you keep your axolotl in can affect how fast your axolotl will grow.

Axolotls can grow slowly if you keep them in a small aquarium as there won’t be enough room for them to move and live comfortably.

Furthermore, the water quality in their enclosure can inhibit their growth rate.

For instance, axolotls can have stunted growth if you house them in a tank with unsuitable temperatures or high ammonia levels.

This is because they will get stressed and even develop a health problem that will affect their growth rate.

Your axolotl may also not grow well if you house them in an overcrowded tank. This is just like when the tank is small, as there will not be enough space to completely grow as much as it should.

An overcrowded tank can also stress your axolotl, and they can refuse to eat.

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Feeding Schedule

The type of food you feed your axolotl can affect their growth rate. For instance, feeding them low-quality food or the wrong diet can slow their growth rate.

Furthermore, giving them one type of food can affect their growth.

For instance, feeding your axolotl with too much-frozen food will not give them enough nutrients they need for their growth.

Axolotl feeding schedules can also affect their growth rate. It is recommended that you feed baby axolotls twice a day with live food and the right portion to help aid their growth.

However, you need to feed juvenile and adult axolotls 2-3 days per week.

Note: it is important to feed axolotl with the right food at the right time. This is because overfeeding them can lead to constipation or impaction.

Furthermore, the more you feed them, the more you will need to clean their tank as your axolotl will create lots of waste.

Also read: How Often Do Axolotls Eat?

How To Make Sure Your Axolotl Is Growing

How To Make Sure Your Axolotl Is Growing
How To Make Sure Your Axolotl Is Growing | Credit: Argument / Canva.com

There are several ways to ensure that your axolotl grows normally; some of them are stated below.

Offer Them Enough Space

Generally, the size of the tank that you keep your axolotl will determine its size.

Therefore, a great way to ensure that your axolotl grows to their full size is to house them in a tank with enough space to swim and live their lives.

You can even house baby axolotl in an adult tank, which will prepare them for when they become fully grown.

Housing a baby in a large tank is more important if you have multiple baby axolotls. This will help ensure all your axolotls grow as much as they can as there is enough space for them.

It is recommended that you house them in a tank at least twice what they need.

The minimum size of an aquarium to house an axolotl is 20 gallons. It is then recommended to add 10 gallons if you plan to keep two axolotls in one tank.

Keep Water Parameters Optimal

The water parameter is not only important to increase the growth rate of your axolotl, but you should also consider it all the time to ensure they get optimal health.

Water parameters are more important for baby axolotls as they grow.

Therefore, you should ensure the temperature is ideal and there is no ammonia or nitrite in the water.

You will also need to place a good quality filter in the tank to remove all the harmful particles from the water.

Furthermore, you should clean their tank and change their water regularly. Another thing is always to check their water parameters regularly to help ensure they are at an ideal level.

Also read: How to Keep An Axolotl Tank Clean

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Offer Good Variety & High-Quality Foods

Your axolotl may not grow because you are feeding them with low-quality food. Food is an important thing that determines how fast your axolotl will grow or how healthy it will be.

Therefore, you need to offer your axolotl a good variety of high-quality standard foods if you want your axolotl to grow very well.

It is recommended that you combine live foods, frozen foods, and pellets to feed your axolotl.

You should avoid buying cheap foods without enough nutrients for your axolotls, and you can buy foods from various food sources.

Also read: 5 Best Axolotl Commercial Food

Separate Baby Axolotls By Their Size

Separate Baby Axolotls By Their Size
Separate Baby Axolotls By Their Size | Credit: wildmedia / Canva.com

Generally, the growth rate of axolotls is usually from one species to another. This means baby axolotls from the same mother will grow differently from each other.

By separating your baby axolotls based on their size, you can ensure that all your axolotls grow very well.

This is because they can limit each other’s growth as they take each other’s space.

Also read: How To Transfer Axolotl and Prevent Temperature Shock


How big is a year-old axolotl?

The average size of a year-old axolotl is 9 inches. However, you can expect that your axolotl is between 6-14 inches long at a year old. This is because the growth of your axolotl will depend on its genetics, nutrition, and environment.

How old is a 4-inch axolotl?

Under normal circumstances, a 4-inch axolotl is usually 4-5 months old. However, your axolotl may have stunted growth if you are sure, it is over 4-5 months old and is 4-inch.

How big do axolotl grow to?

The average length of an axolotl is between 7-9 inches long, but they can grow to around 6-18 inches long. They usually weigh around 5-12 ounces, with the females slightly heavier than the males.

Final Words

The size of an axolotl usually varies from one species to another. This shows there are several factors that can affect their growth rate, from genetics to age.

However, you can ensure your axolotls grow to an ideal size by feeding them with quality foods, providing enough space, creating a good water parameter, etc.

You can message us in the comment section below if you have any experience or questions about the growth rate of axolotls.

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