# Guppy (*Poecilia reticulata*)

> The guppy is a small, brightly coloured freshwater fish native to north-eastern South America and now one of the most popular aquarium fish in the world. Females grow to about 6 cm while males stay around 3 cm and flaunt vivid, patterned tails. Guppies are hardy livebearers that give birth to free-swimming young rather than laying eggs, and they typically live two to three years in a home tank.

- **Category:** Fish
- **Conservation status (IUCN):** Least Concern
- **Range:** Fresh and brackish waters of northeastern South America and nearby Caribbean islands; introduced widely elsewhere.
- **Canonical page:** https://globalanimalguide.org/animals/guppy/
- **Last reviewed:** 2026-07-16

## Scientific classification

- **Kingdom:** Animalia
- **Phylum:** Chordata
- **Class:** Actinopterygii
- **Order:** Cyprinodontiformes
- **Family:** Poeciliidae
- **Genus:** Poecilia

## Facts at a glance

| Attribute | Value |
| --- | --- |
| Scientific name | Poecilia reticulata |
| Diet | Omnivore |
| Habitat | Warm fresh and brackish waters |
| Lifespan | 2–3 years |
| Length | 3–6 cm (1–2.4 in); females larger |
| Top speed | Quick, darting swimmer |
| Conservation status | Least Concern (IUCN) |

## Origins and domestication

Wild guppies come from the warm fresh and brackish waters of north-eastern South America, including Venezuela, Guyana, Trinidad and the Amazon basin. Since the 19th century they have been kept and selectively bred by aquarists, and they are now found in home tanks across the globe. Because they tolerate a wide range of conditions and breed readily, they became the classic beginner's fish. Deliberate and accidental releases have also established feral guppy populations in warm regions far beyond their native range.

## Colours and appearance

The guppy is strongly sexually dimorphic. Males are the smaller sex at roughly 3 cm but carry the dazzling colours, with fan-shaped tails patterned in orange, blue, green, red and black. Females are plainer and noticeably larger, reaching about 6 cm. Decades of selective breeding have produced dozens of fancy strains, from cobra and snakeskin patterns to solid-colour and long-finned varieties.

## Keeping guppies in an aquarium

Guppies are prized because they are forgiving and easy to care for. They thrive in warm water of around 22 to 28 degrees Celsius and do best in small groups in a planted tank. As active, peaceful fish they mix well with other gentle community species and appreciate room to swim near the surface. Regular water changes and stable temperatures keep them healthy across their two-to-three-year lifespan.

## Breeding and livebearing

Unlike most aquarium fish, guppies do not lay eggs; they are livebearers that give birth to fully formed, free-swimming fry. A single female can produce broods of twenty to fifty young every four to five weeks, which is why guppies multiply so quickly. Adults will eat their own fry, so breeders often use dense planting or a separate nursery to protect the young. This rapid reproduction has made the guppy a favourite subject for genetics and evolution research.

## Diet and feeding

Guppies are omnivores with hearty appetites for their tiny size. In the wild they graze on algae, plant matter, insect larvae and tiny aquatic invertebrates. In captivity they readily take flake food, and their colour and health improve with occasional live or frozen treats such as brine shrimp and daphnia. They are quick, darting feeders that patrol the whole tank in search of food.

## Behaviour and temperament

Guppies are lively, sociable little fish that are constantly on the move. Males spend much of the day displaying their fins and courting females with a distinctive S-shaped dance. They are peaceful and non-aggressive, which makes them ideal companions in a community aquarium. Their curiosity and constant activity are a large part of their enduring appeal to fishkeepers.

## Frequently asked questions

### How big do guppies get?

Guppies are small fish. Females reach about 6 cm long, while males are smaller at around 3 cm but are the more colourful of the two sexes.

### How long do guppies live?

In a well-kept aquarium guppies typically live two to three years. Stable warm water, a good diet and regular maintenance help them reach the upper end of that range.

### Do guppies lay eggs?

No. Guppies are livebearers, meaning females give birth to fully formed, free-swimming young rather than laying eggs. A single female can produce broods of twenty to fifty fry roughly every month.

### What do guppies eat?

Guppies are omnivores. They eat algae, plant matter and tiny invertebrates in the wild, and readily accept flake food in the aquarium, supplemented with live or frozen treats like brine shrimp.

### Are guppies easy to keep?

Yes. Guppies tolerate a wide range of water conditions, breed easily and get along with other peaceful fish, which is why they are one of the most recommended fish for beginners.

### Why are male guppies more colourful than females?

Bright colours and elaborate tails help males attract mates, so selection favours showy males. Females are larger and plainer, which helps camouflage them while they carry and give birth to young.

## Sources

- [IUCN Red List — Poecilia reticulata.](https://www.iucnredlist.org/search?query=Poecilia%20reticulata&searchType=species)
- [Animal Diversity Web — Poecilia reticulata. University of Michigan Museum of Zoology.](https://animaldiversity.org/accounts/Poecilia_reticulata/)
- [Wikipedia — Guppy.](https://en.wikipedia.org/wiki/Guppy)

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Source: Global Animal Guide (https://globalanimalguide.org/animals/guppy/). Licensed CC BY-NC 4.0 — free for non-commercial reuse with attribution.