Double Orange Spot Torpedo Rasbora (Pectenocypris korthausae)

Pectenocypris korthausae Double Orange Spot Torpedo Rasbora or Golden Barb), a rare and delicate blackwater species:

Species Overview

• Scientific Name: Pectenocypris korthausae
• Common Names: Double Orange Spot Torpedo Rasbora, Mini Whale Rasbora, Golden Barb
• Family: Danionidae (Rasborinae)
• Origin: Sumatra & Southern Borneo (peat swamps, forest streams)
• Adult Size: 3.5–4.5 cm (≈1.4–1.8 in)
• Conservation Status: Near Threatened (IUCN) 

Tank Requirements

• Minimum Tank Size: 15–20 gallons for a shoal
• Water Parameters:
  • Temperature: 24–27°C (75–81°F)
  • pH: 4.0–6.5 (soft, acidic blackwater)
  • Hardness: Up to 8 dGH
• Décor:
  • Dense planting, leaf litter, driftwood
  • Dark substrate for natural coloration
• Filtration: Gentle flow; peat filtration recommended
• Lighting: Medium to subdued
• Cover: Tight lid—active swimmers 

Diet & Feeding

• Natural Diet: Zooplankton, insect larvae
• In Captivity:
  • Live/frozen: Bloodworms, mosquito larvae, brine shrimp, cyclops, daphnia
  • High-quality micro flakes and small sinking granules
• Feeding Tips:
  • Offer varied protein-rich foods for color and health
  • Feed small portions 1–2 times daily 

Behavior & Compatibility

• Temperament: Peaceful, shoaling species
• Ideal Group Size: 6+ individuals
• Tankmates:
  • Other small, peaceful fish (Boraras, small rasboras, pygmy gouramis)
  • Avoid large or aggressive species
• Tank Zone: Mid to upper levels 

Breeding

• Difficulty: Very high; no confirmed home aquarium success
• Challenges:
  • Requires soft, acidic water and dense cover
  • Egg-scatterer; likely needs separate breeding tank
• Tip: Condition with live foods; remove adults post-spawning if eggs appear 

Special Considerations

• Sensitive to water quality—perform frequent small water changes
• Best in mature blackwater setups with tannins
• Rare in trade; often wild-caught, so acclimation is critical