5 Simple Reasons Why Pregnant Guppy Died Before Giving Birth

It can be disheartening when your pregnant guppy died before giving birth. You are left wondering why the fish suddenly died. If you knew what caused the death, then maybe you could have prevented it. The main reasons why a pregnant guppy might die before giving birth are:
  • New Environment
  • Stress
  • Danger
  • Poor Water Conditions
  • Genetics
Read on if you are keen to prevent the death of your precious pregnant guppies.

Why Do Pregnant Guppies Die Before Birth?

Pregnant Guppy Died Before Giving Birth There are a few reasons that can cause pregnant guppies to die before giving birth. Some common factors which you can control are related to their living environment or the tank mates they have. However, other factors like sickness or genetic issues are out of your control. Here are some things you can do to reduce the chance of a pregnant guppy dying before giving birth.

New Environment

Guppies are highly sensitive to their environment. Thus, moving a pregnant guppy to a new aquarium without taking proper precautions can cause it to die before giving birth. It is recommended not to move a pregnant fish to a new fish tank until it has given birth to avoid any unnecessary complications.


Guppies are live-bearing fish. They give birth to live baby fry. However, if they experience stress before giving birth, they can die. For example, aggressive tank mates can harass the pregnant guppy causing it to die. It helps to use a breeder box to reduce the risk of death and danger to fry before, during, and after pregnancy.


It is best not to put predatory fishes together with a pregnant guppy.  The unnecessary stress created can increase the chances of miscarriage and it will also endanger the baby fries after the guppy has given birth.

Poor Water Conditions

The quality of the water in the aquarium is important for pregnant guppies to birth healthy guppy fry. Ensure that you keep the tank clean. You can check the pH level, ensure the filter works correctly, and ensure that the water temperature is stable. Check that there are no ammonia or nitrites.


Sometimes, death before birth is unavoidable. For example, in community tanks, there may be in-breeding. In-breeding can lead to genetic problems which can lead to your guppy dying before giving birth. Some types of guppies experience this more than others. For example, fancy guppy.

Can Guppies Have Miscarriages?

Pregnant guppies can delay their pregnancy period if they sense any danger or are feeling stressed out by their living environment.
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In extreme stress situations, the gestation period of the guppies may shorten which can cause miscarriages or forced abortion. References
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