Species profile
Blue Danio
Danio kerri
Peaceful
Easy care
75 L minimum aquarium
4–5 cm adult size
Top mid
Minimum group: 8
About this species
General notes for hobby use.
Keep as Danio kerri under current taxonomic treatment. A secure lid matters because active danios jump readily.
Water parameters
Suggested general range for long-term care.
Temperature
22–26 °C
pH
6–7.5
GH
2–15 dGH
KH
Not yet documented
Flow preference
Moderate–high
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Minimum group: 8
Tank zone
Top mid
Territory level
None
Predation risk
Tiny fry
Bioload factor
0.5
Active shoaling danio. Needs horizontal swimming room, good oxygenation and a secure lid.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
No
Plant safe
Yes
Shrimp safe
Yes
Snail safe
Yes
Cave breeder
No
Digs substrate
No
Jump risk
Yes
Natural history & care
Research-backed context for long-term aquarium care.
Lifespan
4–6 years
Diet type
Omnivore
Minimum aquarium volume
75 L
Minimum footprint
80 × 30 cm
Accepted scientific name
Danio kerri
Alternative names
Blue Danio, Kerr's Danio, Brachydanio kerri
Native range
Ko Yao islands and adjacent southern Thailand region.
Natural habitat
Clear streams and flowing freshwater with rocks, gravel and vegetated margins.
Diet & feeding
Small aquatic/terrestrial invertebrates plus plant material; accepts varied quality flakes, micro-pellets and frozen/live foods.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Females are deeper-bodied and rounder; males are slimmer and often more intensely coloured.
Breeding
Egg-scattering cyprinid with no parental care; adults readily eat eggs and newly hatched fry.