Fauna
Fish

Boeseman's Rainbowfish

Melanotaenia boesemani

Also known as Boesemani Rainbowfish

Boeseman's rainbowfish displays an unmistakable two-toned coloration, with mature males sporting a cool blue-grey front half contrasting against a vibrant orange-red rear. Endemic to the shallow, calcium-rich waters of the Ayamaru Lakes in West Papua, shoals glide through dense submerged vegetation to forage near the surface. At daybreak, dominant males dramatically flash their brightest hues and flare their fins to court females and defend miniature territories.

FreshwaterColorful
Boeseman's Rainbowfish reference
(c) rockerBOO, some rights reserved (CC BY-SA) · cc-by-sa
—observations
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EndangeredConservation statusIUCN Red List categoriesLCNTVUENCREWEXEndangeredRed List categories, explained →
Key facts
Diet & preyMosquito larvae, Water fleas, Surface insects
Predators
  • Kingfishers
  • Herons
  • Invasive predatory fish
ThreatsHistorical overharvesting for the aquarium hobby, water pollution, and competition from non-native species
HabitatsShallow karst lakes, clear vegetated marshes, and sluggish tributary streams
Life span5–8 years
Classification
  1. OrderAtheriniformes
  2. FamilyMelanotaeniidae
  3. GenusMelanotaenia
  4. SpeciesMelanotaenia boesemani
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Safe to observe at a normal distance.
What to notice
Look for a compressed, deep-bodied fish with a distinctive two-toned blue and orange pattern in mature males.
Support conservation
Never catch wild individuals or introduce non-native species to their sensitive karst lake ecosystem.
Responsible observation
  • Ethical sourcing: Ensure any aquarium specimens are certified captive-bred rather than wild-caught.
  • Lakeside viewing: Approach clear shallows quietly to avoid startling active schools into deeper weed beds.
Related species
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