How to raise molly fry fish

Written by nick redfern Google
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How to raise molly fry fish
Breed molly fish at home in an aquarium. (Getty Thinkstock)

If you want to breed fish in an aquarium, one of the best breeds to consider is the molly fish, or, Poecilia sphenops. There are almost 40 species of molly fish. They are strong and sturdy, which makes them excellent breeders, since that is pretty much all they do. If you want to breed mollies -- their young are called fry -- there are facts you need to know to make sure everything runs smoothly.

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Now widespread, mollies were originally located in select parts of the United States, Argentina, and southern and central Africa. One of the most notable things about mollies is that they can live in both freshwater and brackish water. Brackish water is not quite as salty as sea-water, but has a significant salinity level. Unlike many fish, mollies give birth to live offspring, rather than eggs. This makes breeding mollies much easier than waiting for eggs to hatch.


Molly fish come in a variety of colours, such as white, black, and orange with white spots . They are social fish that typically are very comfortable living in groups of around eight or more in temperatures of roughly 80F. The recommended ratio is two females for every male. Carefully study the mollies on display in the pet shop. The females are typically bigger than the males. If those larger mollies have distended stomachs, they may already be pregnant. Get your project moving at speed purchasing a good supply of these bigger fish, .


Females should be fed with nourishing cucumber and water-fleas to ensure theyare at their optimum health before and during pregnancy. Fertilisation of the eggs comes via sperm contained in the male's "Gonopodium," an organ located in the anal fin. The average gestation time is 21 to 30 days. Since mollies give birth to live babies, rather than eggs, you should keep a careful eye on the tank. There is a good reason for this: newborn mollies are so tiny that the parent mollies often accidentally eat them. So, when the young are born, quickly remove them from the tank and place them into another tank, away from the mature adults.

How to raise molly fry fish
From pregnancy to birth. (Jupiterimages/ Images)

Feeding the fry

The new environment should be one in which the fry will thrive. Keep the temperature the same as in the original tank -- around 80F -- and make sure there are plenty of water plants in which the fry can hide. In the wild, this protects them from getting eaten. But, fry also enjoy living in environments that keep them stimulated, so provide them with a varied and interesting aquarium. Take regular fish-flakes and use your hands to grind them into a fine dust, which the young fry will be able to digest easily. After a period of 1 to 1 and a 1/2 months -- at which point the fry will have reached a size of approximately 1.27 cm (1/2 an inch) -- you can safely return them to the main tank, without fear of them getting eaten.

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