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Velvet Digest

How do you tell male and female mollies apart?

Author

Ava Hall

Updated on May 01, 2026

Fin Shape. Most adult male mollies have longer and more elaborate tails, pectoral fins and dorsal fins than females do. However, the most accurate way to distinguish male mollies from female mollies is to examine the anal fin, located on the underside of the body, between the pectoral fins and the tail.

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Keeping this in view, what does a male molly look like?

Male Mollies Males are more torpedo-shaped and have bigger fins than females. The males also have pointed gonopodia, modified anal fins they use to mate with females. Dominant male mollies intensify in color and grow larger fins to produce a mating show for females or to show dominance to other males.

why is my male molly chasing the female? There are many reasons for the mollies to chase each other. Predominantly, a male molly might chase its female counterpart to mate. A male molly may also become aggressive with the other male population in the tank to mark its territory or for the attention of females present in the aquarium.

Also asked, what does a female molly fish look like?

And its accuracy is proven to be effective. Female mollies usually have rounded bodies. They are sized quite bigger than males, have a bulky abdomen area for the purpose of conceiving, and their anal fins are shorter and triangular in shape.

Can Mollies change gender?

No fish that has its gender determined by its genetics can actually change sex. Some cichlids have the ability to change sex because they do not have their sex determined genetically. That is not true of any poeciliids including mollies, swordtails, guppies or any of the other common poeciliids.

Related Question Answers

Can different color mollies breed?

Different colored mollies can breed, yes, since they are just color variations on the same species. There have been instances of guppies cross breeding with platies (I think it's platies), but the resulting fry are sterile and generally don't live long.

How many babies does a Molly have?

Molly no. 1 gave birth to five babies, molly no. 2 gave birth to 4 babies and the third one gave birth to only 1 fry.

Do Mollies eat their babies?

It is because the mollies are very nippy and tend to become very aggressive eater. They will eat almost anything that fits in their mouth. The new born babies are very small just about the size of a pellet food which is why molly are seen eating their own babies after giving birth.

How do mollies mate?

Molly Fishes breed by using the internal fertilization procedure. After the mating of male and female mollies, the ejaculation of male molly allows fertilizing eggs inside the female molly. These eggs remain inside the female molly until the fry mollies are prepared enough and released from the eggs.

What is the lifespan of a molly fish?

So, how long do Molly live? Typically, a molly fish can live up to 5 years, they can survive well beyond this period if they are well cared for and live in omptimum conditions.

Do Mollies lay eggs?

No, molly fish do not lay any eggs, they give birth to complete fish that are ready to swim and feed in a matter of hours. When the eggs hatch, the female drops the fry directly into the aquarium. Female mollies can store up to 100 eggs in their bodies, and even more in the case of larger molly fish breeds.

How can you tell a goldfish is male or female?

To identify a female goldfish, look for a rounder, thicker body shape. Females may also have a bulge on one side as breeding season approaches, and their vent, or anal opening, may protrude slightly. Male goldfish often have a thinner, more streamlined body shape than females, with a concave vent and a midline ridge.

How many mollies should be kept together?

Keeping Molly Fish Together You should keep them in groups of at least four or more, they naturally stick together. The group should be made of mostly females since males are known to harass them.

How can you tell if a molly fish is pregnant?

How to Tell if a Molly Fish is Pregnant?
  1. Watch for any behavioral changes in your female molly fish. Some of the changes in behavior are that she may move slower in the water, stay away from other fish and eat more.
  2. Note if a dark triangular spot has appeared near the anal vent.
  3. Look for the stomach to change.
  4. View your molly fish throughout the pregnancy.

How do fishes sleep?

The simple answer is yes! They are sleeping, and they can sleep at any time during the day or night. Fish do sleep with their eyes open, because they don't have eyelids (except for some sharks) to close! For fish, sleep is more like a resting period similar to a daydream that humans might experience.

Do Mollies need a heater?

Do Mollies Need a Heater to Survive? As tropical freshwater fish, mollies enjoy warmer water. Therefore, unless you live in a tropical climate, the answer is always: “Yes, you do need a heater for your molly fish tank.” I recommend the Eheim Jager aquarium heater, which you can buy from Amazon.

How many Mollies Can I put in a 10 gallon tank?

4 mollies

Do Mollies eat algae?

The truth is that mollies do in fact help with cleaning up the algae in your tank. All mollies will will eat algae, but out of all of them, the true black molly (Poecilia Sphenops) is the best of the group. They will usually help with the algae growing on rocks and plants.

Does Molly fish need oxygen?

Molly fish breathe dissolved oxygen in their water, and they do so through their gills. Despite water (H2O) containing oxygen, fish require oxygen molecules (O2) to survive. You can introduce oxygen to an aquarium, by agitating the water, so that oxygen from the atmosphere gets into the water.

Can Molly fish live with bettas?

Bottom feeders will leave the Bettas beautiful fins alone, and do well together. Live bearing fish, like Platies, Mollies, Guppies and Swordtails all make great tank mates for Bettas. Also, Danios, because they are so peaceful, do well with Bettas. Hatchets, Rasboras, and Tetras are great tank mates for Bettas.

Are Mollies supposed to chase each other?

Yes it's normal, it could be that they are breeding too. Mollies sometimes chase and attack other mollies while feeding but they will not cause that much harm. However if you have a tank too small and the fish getting bullied is not getting any food at all -> It might die from stress and sickness.

Can Mollies kill each other?

It is quite possible yes. Depending on the tank size and the number of Mollies in the group. Also the group dynamics of X# males vs X# females and the sudden change in dynamics.

Are Mollies territorial?

They aren't so much territorial as they are intolerant of other males. One male to many females is most likely to minimize any aggression.

Should I separate pregnant Molly?

Yes, it looks pregnant. Breeder nets/traps often stress the mom out and she might abort. It's best to put her in a separate tank a couple of days before so she won't be too stressed and the babies will be safe.