Native Biome: Freshwater streams and ponds; extremely common in home aquariums.
Guppy
Poecilia reticulata
Named after Robert John Lechmere Guppy; classic livebearing aquarium fish.
Linnaean Taxonomic Tree
Under 1 g
Female: Larger than malesQuick darting
Burst Acceleration1–2 years
Captivity: 1–3 yearsCompare Look-Alikes
vs Betta
🐣Growth & Lifespan
Birth to old age slider
🔍 Distinctive Diagnostic Markings & Anatomy
Critical morphological field marks naturalists use to verify species identification in the wild.
Males highly variable ornamental colors; females usually grayish with gravid spot.
Small terminal mouth.
Large.
Males have gonopodium (modified anal fin).
Often ornate in fancy males.
Males smaller/colorful; females larger/plainer
🍖 Trophic Role & Hunting Strategy
OmnivorePicks tiny invertebrates and algae films.
🏕️ Social Behavior & Activity Rhythms
DiurnalSchooling; prolific breeders
Live birth; little post-natal care
Life Cycle, Growth & Lifespan Journey
| Age | Stage | Length/Height | Weight |
|---|---|---|---|
| Birth / Hatch / Day 0 | Young | 6–8 mm | 0.000005–0.00001 g |
| Early growth | Young | 8.9–14.2 mm | 0.12–0.48 g |
| Mid juvenile | Juvenile | 14.4–26.2 mm | 0.35–1.4 g |
| Late juvenile | Juvenile | 20.4–39.2 mm | 0.6–2.4 g |
| Near maturity | Adult | 26.4–52.2 mm | 0.85–3.4 g |
How Big Will a Guppy Get?
Calculate estimated adult weight, shoulder height, remaining growth timeline, and weekly development rate based on current age and biometrics.
Conservation Status & Population Dynamics
Abundant
Subject to ongoing wildlife telemetry monitoring
- •Local habitat change
- Habitat protection
- Public education
Field Intelligence & Diagnostic Hub for Guppy
Often ornate in fancy males.
Audio frequency analysis, territorial roar/call synthesis, and harmonic resonance measurements.
Ecosystem food web, trophic interactions, and cohabiting species in South America / Aquarium.
⚖️ Look-Alike Species Differentiation Matrix
Instant one-click comparison tools to prevent common field misidentifications
Guppy vs. Betta
Key DifferentiationBettas are bubble-nesters with labyrinth organs; guppies are livebearers with a gonopodium on males.
Guppy tank size & care
- Minimum tank
- 40 L (11 US gal)
- Adult size
- 5 cm (2 in)
- Temperature
- 22–28 °C (72–82 °F)
- pH
- 7–8.5
- Group
- At least 3
- Temperament
- Peaceful
- Care level
- Easy
Breeds readily: plan for fry.
Typical husbandry values from Seriously Fish, FishBase and OATA. Captive-bred fish often tolerate a wider range.
Guppy Tank Calculators
Guppies are livebearers that breed readily, so a tank can go from lightly to heavily stocked within a few months. More fish means more waste: regular water changes and a filter sized for the real water volume keep ammonia and nitrite at zero.
Work out how much water to swap each week with the water change calculator.
Figures:Merck Veterinary Manual: Management of aquarium fish
Water Change Calculator
How much water to change, and the percentage that brings nitrate down to your target.
Open calculator
Aquarium Size Calculator
Tank volume in litres and gallons, and the real water volume after substrate and decor.
Open calculator
Filter Flow Calculator
Turnover per hour from your filter’s real flow, and the right range for your fish.
Open calculatorHow to Identify Guppy from a Photograph
Standard operating procedures for photographers and field naturalists submitting sightings for verification.
- 📷Clear side profile
- 📷Head/face close-up
- 📷Full body in natural light
- 🔍Livebearing
- 🔍Male gonopodium
- 🔍Colorful male tails
- ⚠️Confusing fancy males with endlers
- ⚠️Confusing with bettas
Frequently Asked Questions About Guppy
Verified answers compiled by zoologists, wildlife biologists, and field guides.
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