How to tell when a molly is in labour?

Written by annie carter
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How to tell when a molly is in labour?
Guppy (sommail/iStock/Getty Images)

Molly fishes are a type of guppy that give birth to live babies instead of producing eggs like other fish. Breeding occurs often in molly fish; even when there is no male in the tank for several months, the female will release babies at least once a month. It is important to identify when a molly is pregnant and know the approximate time the babies will be born. This is so you can protect the babies after birth because mollies have a tendency to eat their young.


  1. 1

    Watch your pregnant molly for any behaviour changes. Some changes include moving slower, staying away from other fish in the tank and eating less.

  2. 2

    Track the days since you noticed your molly was pregnant. A typical gestation period is around 60 days.

  3. 3

    Note if the dark triangular spot near the anal vent has got bigger and darker in colour. This indicates that labour and birth are near.

  4. 4

    Look for changes in your molly's stomach and overall girth. Pregnant and near-labour mollies are much bigger in the middle and look stretched out.

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