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South America – but are now widespread across the world


up to 2.5 inches

Aquarium Size:

50 litres/10 gal

Preferred water conditions:

  • Temp: 22 – 28°C
  • pH: 6.5 – 7.5
  • Hardness: Hard


Guppies are omnivorous and will happily accept a wide range of aquarium foods. This can be supplemented with meaty treats such as blood worms and brine shrimp.


Guppys are a peaceful fish but are prolific breeders. Males may harass females in attempts to impress them with their colours, for this reason, it is best to keep 2 females to every male, to spread out the male’s attention.

An alternative is to keep only male fish, without females they will have no-one to harrass. However, be aware that adding any female livebearer, even of a different species (eg molly or swordtail) may attract the male’s attention.


Males are far more colourful than females. This is the other reason that many aquarists choose to keep only males.

The anal fin of a male will appear narrow and pointed. The females anal fin will be broad or wider.

Males are slender bodied whilst females tend to be a little rounder.

Females grow larger.


Breeding guppys is extremely easy and they will breed constantly without encouragement.

Guppys are livebearers which means they give birth to live fry.

Females will become larger and will develop a dark patch on their back end known as a gravid spot. This spot will become darker as their pregnancy progresses.

Parents and other fish are likely to eat the fry. A densely planted tank will provide lots of hiding places for them to hide and grow. Alternatively consider a separate fry tank.


Guppys are one of the most popular aquarium fish. They are very beginner-friendly as they are quite hardy and can be an interesting first breeding project.

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