Description
Koi Fish (Cyprinus rubrofuscus)
📌 Basic Info
Scientific Name: Cyprinus rubrofuscus
Family: Cyprinidae
Origin: Japan (bred from common carp)
Size: 18 – 36 inches (45 – 90 cm), depending on variety and pond size
Lifespan: 25 – 35 years (some live 50+ years with proper care)
Tank Zone: All zones (active swimmers throughout pond)
🌊 Water Parameters
TDS: 150 – 300 ppm
pH: 6.8 – 8.0
Temperature: 15 – 25°C (59 – 77°F), coldwater fish but hardy to wider range
Hardness: 5 – 15 dGH
🐟 Characteristics
Brightly colored ornamental carp with patterns of white, red, yellow, orange, black, and blue.
Symbol of luck, prosperity, and longevity in many cultures.
Intelligent and social – can recognize owners and even feed from hands.
Thrive best in outdoor ponds but can be kept in very large aquariums temporarily.
🍽️ Food
Type: Omnivorous.
Diet: High-quality koi pellets, vegetables (peas, lettuce, spinach), fruits (orange slices, watermelon), worms, shrimp, insects.
Feeding: 1–2 times daily; adjust amount based on pond temperature (they eat less in cooler water).
🛠️ Maintenance
Tank/Pond Size: Minimum 250 gallons per koi (best suited for outdoor ponds).
Filtration: Very strong filter with high oxygenation (they produce a lot of waste).
Decor: Smooth rocks, pond plants, shaded areas; provide plenty of swimming space.
Water Change: 20–30% weekly for ponds/tanks; ensure stable water quality.
👥 Social Behavior
Minimum Group Size: At least 3–4 (they are social fish).
Tank Mates: Goldfish, Orfe, Plecos (large), peaceful pond fish.
Avoid: Aggressive fish or tropical species with different requirements.
✅ Do’s
Keep koi in large outdoor ponds for best growth and health.
Provide high-quality filtration and aeration.
Feed a balanced, seasonal diet (special koi food in winter/summer).
❌ Don’ts
Don’t overcrowd ponds (they grow very large).
Don’t mix with aggressive or predatory fish.
Don’t neglect water quality – they are sensitive to poor conditions.
⭐ Quick Tips
Long-living, majestic pond fish admired worldwide.
Best for outdoor ponds, not small aquariums.
Friendly, hardy, and a symbol of good fortune – a true centerpiece fish.
