Native Biome: Shallow freshwater habitats; widely kept in home aquariums.
Betta
Betta splendens
Also called Siamese fighting fish; long-finned aquarium strains are selectively bred.
Linnaean Taxonomic Tree
A few grams
Female: Slightly smaller oftenShort darting bursts
Burst Acceleration2–3 years
Captivity: 2–4 years typicalCompare Look-Alikes
vs Guppy
🐣Growth & Lifespan
Birth to old age slider
🔍 Distinctive Diagnostic Markings & Anatomy
Critical morphological field marks naturalists use to verify species identification in the wild.
Vibrant cultivated colors; long flowing fins on many males.
Upturned mouth; labyrinth organ allows air breathing.
Large for size.
Long unpaired fins in veil-tail strains.
Often elaborate in aquarium forms.
Males usually longer fins and brighter colors in show strains
🍖 Trophic Role & Hunting Strategy
MesopredatorSurface-oriented insectivore in wild-type habitats.
🏕️ Social Behavior & Activity Rhythms
DiurnalMales territorial / aggressive to other males
Male bubble-nest care
Life Cycle, Growth & Lifespan Journey
| Age | Stage | Length/Height | Weight |
|---|---|---|---|
| Hatch | Fry | 2–4 mm | 1–3 mg |
| 4 Months | Adult | 5–7 cm | 2–4 g |
How Big Will a Betta Get?
Calculate estimated adult weight, shoulder height, remaining growth timeline, and weekly development rate based on current age and biometrics.
Conservation Status & Population Dynamics
Wild populations threatened; captive strains abundant
Subject to ongoing wildlife telemetry monitoring
- •Habitat loss
- •Pollution
- •Wild collection historically
- Habitat protection
- Public education
Field Intelligence & Diagnostic Hub for Betta
Often elaborate in aquarium forms.
Audio frequency analysis, territorial roar/call synthesis, and harmonic resonance measurements.
Ecosystem food web, trophic interactions, and cohabiting species in Southeast Asia / Aquarium.
⚖️ Look-Alike Species Differentiation Matrix
Instant one-click comparison tools to prevent common field misidentifications
Betta vs. Guppy
Key DifferentiationGuppies are livebearing poeciliids; bettas are anabantoids that build bubble nests and often have longer unpaired fins.
Betta tank size & care
- Minimum tank
- 20 L (5 US gal)
- Adult size
- 6.5 cm (2.6 in)
- Temperature
- 24–30 °C (75–86 °F)
- pH
- 6–8
- Group
- One per tank
- Temperament
- Semi-aggressive
- Care level
- Easy
One male per tank. OATA: at least 20 L for a male, 60 L for a group of females.
Typical husbandry values from Seriously Fish, FishBase and OATA. Captive-bred fish often tolerate a wider range.
Betta Tank Calculators
OATA recommends at least 20 litres for a single male betta and at least 60 litres for a group of females, with a filter and a 25% water change every week. Bettas are tropical fish with long fins, so they need a heater and only gentle water flow.
Check that your filter is not too strong with the aquarium filter flow calculator, which has a gentle-flow range for bettas.
Figures:OATA: How to look after Siamese fighting fish (bettas)
Filter Flow Calculator
Turnover per hour from your filter’s real flow, and the right range for your fish.
Open calculator
Heater Calculator
Heater wattage from tank size, room temperature and the temperature your fish need.
Open calculator
Aquarium Size Calculator
Tank volume in litres and gallons, and the real water volume after substrate and decor.
Open calculatorHow to Identify Betta 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
- 🔍Labyrinth air-breathing
- 🔍Long fins (males)
- 🔍Upturned mouth
- ⚠️Confusing with guppies (livebearers with different body/fin plans)
- ⚠️Sexing by color alone
Frequently Asked Questions About Betta
Verified answers compiled by zoologists, wildlife biologists, and field guides.
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