Celestial pearl danios have a narrow, fusiform body with prominent fins. Males are thinner and brighter, with a deep blue body and pearlescent spots all over the flanks. These dots are sometimes arranged in rows or in a galaxy pattern.

Males have a red stripe, lined with black, that runs through the middle of the fish’s nearly-translucent dorsal fin. Males also have a red belly, and dominant males have a red stripe on their backs.

Female celestial pearl danios aren’t as brightly colored and have less-bright pearly dots. On females, instead of red dorsal, pelvic, and caudal fins, these fins are orange and the anal fin is translucent.

Scientific name: Danio margaritatus
Common names: Celestial pearl danio, galaxy rasbora, fireworks rasbora
Distribution: Myanmar and northern Thailand
Size: 0.75–1 inch
Life expectancy: 3–5 years
Color: Dark blue with white/yellow spots in a galaxy pattern
Diet: Omnivore
Temperament: Peaceful
Minimum tank size: 10 gallons