What do Molly Fish Eggs Look Like? (Are they real?)

Mollies are one of the most popular aquarium fish and are known for reproducing quickly. It is essential to understand what molly fish eggs look like in case you want to breed them in your aquarium. But do molly fish eggs even exist? Are they real or just a myth? In this article, we will explore what molly fish eggs look like and uncover whether they are real.

Does Molly Fish Lay Eggs or Give Birth?

The answer is both! Mollies reproduce through ovoviviparity, which means that a female molly will carry her eggs internally until they are ready to hatch. After approximately five weeks, the female will give birth to live fry instead of laying eggs. The fry can then be placed into the aquarium with their mother once they’ve grown large enough to avoid being eaten by other tankmates. When given proper care, mollies usually produce dozens of pups every few months.

What do Molly Fish Eggs Look Like? (Are they real?)

Why do Molly Fish lay Eggs?

Underdeveloped or unhealthy Molly Fish may lay eggs due to malnutrition or stress caused by overcrowding in an aquarium. These stressful conditions can lead to hormonal imbalances that can cause females to release unfertilized eggs to reduce stress levels.

What do Molly Fish Eggs Look Like?

Generally speaking, molly fish eggs are small and semi-transparent. They appear as dark spots on the bottom of the tank or attached to plants, decorations, and other surfaces in the aquarium.

The egg capsules contain anywhere from two to eight individual eggs depending on the molly’s size. The tiny eggs have an orange hue, easily visible against most aquarium substrates such as gravel or sand.

How do you Identify Molly Fish Eggs?

The first thing to look for is the transparent jelly-like masses that hold the eggs together in small clusters or strings. You may also see white or yellowish-colored spots on them; these spots are clusters of hundreds of tiny clear eggs stuck together. The second identifier is the size; each egg is about 1 millimeter in diameter, which makes them very hard to spot without close inspection.

Do Molly Fish Eggs Hatch?

The process of hatching molly fish eggs is relatively simple. All one needs to do is provide their mollies with the right conditions for spawning, such as warm water, plenty of hiding spaces, and abundant vegetation to spawn in.

 Once the female has laid her eggs, it will only take about two days for them to hatch. The baby fry must then be fed small, live foods such as micro worms or brine shrimp until they are big enough to feed on flakes or pellets.

Reasons for Mollies to lay eggs Instead of Fish fry

Mollies lay eggs instead of fish fry for a variety of reasons.

Unfertilized eggs

Unlike other fish, which fertilize their eggs internally, mollies rely on external fertilization by male mollies to propagate their species. When female mollies release unfertilized eggs into the water column, males will come behind them and fertilize them with sperm cells from their testes.


As with any aquatic creature, if the environment isn’t correctly taken care of and the water conditions aren’t ideal, then infections and bacteria can quickly start to grow inside the tank.

If these infections reach high levels, they can lead to several health problems in the fish, which often results in their being unable to reproduce successfully and instead laying eggs instead of producing fry.


A lack of adequate food or a proper diet can cause malnutrition. In an aquarium setting, mollies may need access to nutritious foods that provide enough vitamins and minerals for successful breeding. Suppose a female needs to receive more nutrition in her diet.

In that case, it can cause her to skip the process of producing fry and resort to egg laying as an alternative reproductive strategy.


Stress can physically and psychologically affect fish, such as impairing their immune system and disrupting their feeding habits. Laying eggs instead of fry can be seen as an adaptation to environmental stressors in the tank or aquarium that may be causing anxiety or fear in the fish. This could include too much light or noise, overcrowding, aggressive tank mates, or even sudden temperature or water chemistry changes.

How many Babies do Mollies have?

Mollies, like many other live-bearing fish species, reproduce through ovoviviparity. This means they carry the eggs inside their bodies until they hatch and the fry (newborn fish) emerge.

 On average, a female molly can give birth to anywhere from 10-200 fries at once! The number of fries depends mainly on the size and age of the female – larger and older females tend to produce more offspring than smaller, younger ones.

How Long are Molly Fish Pregnant?

The pregnancy period for female mollies varies depending on several factors, such as water temperature and quality, tank size, and the age of the female. On average, a female molly can stay pregnant anywhere from three weeks to one month. During this time, it is essential to ensure your tank has plenty of space for your mollies to swim around freely to avoid stress. Provide an ample supply of food and keep up with regular water changes to ensure your fish remains healthy during its pregnancy.

What do Molly Fish Eggs Look Like? (Are they real?)

How often do Mollies get Pregnant?

Female mollies typically become sexually mature at around 4-5 months and can get pregnant when available male mates are. Depending on the environment, females can give birth to a new batch of fry every 28-35 days.

 But female mollies can store sperm from one mating for up to six months, meaning they may give birth several times without needing further matings with males. This is why it’s recommended that molly owners keep only one male per tank: otherwise, the females will be constantly harassed for mating!

How to Identify a Pregnant Molly Fish?

The first step in identifying a pregnant molly is to inspect the shape of her body closely. Female mollies have an egg-like form when they become gravid (pregnant), compared to non-gravid females’ slim bodies.

The overall size of her body will also increase significantly during pregnancy, although this may not be noticeable until after 30 days of gestation. Look for any dark spots near her vent; these spots indicate eggs she carries inside her body.

One of the most common indicators of a pregnant Molly is her belly, which will become swollen and brightly colored as she fills up eggs throughout her pregnancy. Her stomach may appear slightly larger than usual due to the developing babies. The shape of her body may also change as she grows rounder and fuller with each passing day.

Mollies display more aggressive behavior than usual. They may begin swimming erratically around their tank or chasing other fish aggressively. Secondly, pregnant Mollies try to escape from their tanks more often; they’ll constantly attempt to jump over the edge of their tank in search of a place to lay eggs.

How to Breed Mollies?

First, the tank needs to be set up correctly. The tank size should depend on the number of mollies being kept; ideally, there should be one male and two females per 10 gallons of water. The temperature should remain between 73-80 degrees Fahrenheit, and the pH level should range from 7-8. Also, introduce plenty of plants into the tank so they can hide and lay their eggs among them.

You’ll need at least two adult mollies from two different parents since siblings should not breed together. This will help prevent any genetic issues due to inbreeding. You will then need to provide plenty of vegetation for hiding places and create separate spaces or divide the tank if necessary, as males will become aggressive towards females during the breeding season.

How to Take Care of Baby Mollies?

One of the key elements for keeping baby mollies healthy is ensuring they have enough food. As baby mollies grow, their diet should consist primarily of brine shrimp or daphnia, providing them with essential nutrients such as proteins and lipids.

It’s important to remember that you should avoid overfeeding your baby mollies, as this can lead to unhealthy bloating or other digestion issues. Additionally, ensure the tank water is replaced weekly so your baby mollies get clean water free from contaminants and pollutants.

What do Molly Fish Eggs Look Like? (Are they real?)

Does Molly Fish eat their Babies?

The answer is yes – molly fish may eat their fry under certain circumstances. This behavior is usually observed when the tank is overcrowded, or the female does not have enough food to nourish her young.

 Additionally, if the fry is born weak or deformed due to genetics or water conditions, the mother may see them as a burden and resort to eating them. In some cases, even healthy fry may be cannibalized by aggressive male mollies who compete for mates.


In conclusion, molly fish eggs are a real thing! They are small, round, and slightly transparent, with an orange hue. The female molly will lay them on the substrate or plants in the aquarium, where they hatch after several days.

When looking after the eggs, water quality is one of the most critical factors for successful hatching. Therefore, if you plan to keep mollies in your tank or pond, make sure that you check their water parameters regularly.

More Read:

Does Molly Fish Give Birth all at once? (Surprising Answer)

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