🐠 Japan Blue Double Sword Guppy (Poecilia reticulata)

Add elegance to your aquarium with the Japan Blue Double Sword Guppy—vibrant blue color, peaceful nature, and easy care for all aquarists.

🌊 Product Overview

The Japan Blue Double Sword Guppy is a stunning freshwater fish prized for its metallic blue sheen and graceful double-sword tail. Originating from selective breeding in Japan, this guppy variety adds a refined touch of color and motion to any tank. Hardy, peaceful, and easy to care for, it’s perfect for both beginners and seasoned aquarists looking to brighten their aquarium with an active, eye-catching species.

🩵 Key Features & Appearance

• Scientific Name: Poecilia reticulata

• Common Name: Japan Blue Double Sword Guppy

• Origin: Selectively bred in Japan from South American guppy strains

• Body Color: Metallic “Japan Blue” hue running from the head to the caudal peduncle (tail base)

• Tail Type: Double swordtail — with two fine, elongated extensions on the upper and lower edges of the tail

• Sexual Dimorphism: Males are smaller but more colorful with extended fins; females are larger with rounder bodies and duller coloration

• Adult Size: Males: 2.5–3.5 cm | Females: 4–6 cm

• Lifespan: 2–3 years under proper care

🌡️ Water Parameters & Tank Conditions

Japan Blue Double Sword Guppies are adaptable but thrive best in stable, well-maintained aquariums.

• Tank Size: Minimum 10 gallons (40L) for a small group

• Temperature: 24–28°C (75–82°F)

• pH Level: 6.8–7.8 (slightly alkaline preferred)

• Hardness: 8–12 dGH (moderately hard water)

• Filtration: Gentle filtration with moderate water flow; sponge filters work best for breeding setups

• Aquascape: Guppies appreciate planted tanks with plenty of hiding spaces and open swimming areas

• Lighting: Moderate lighting to bring out the metallic blue coloration

Regular partial water changes (25–30% weekly) are essential to keep the environment clean and prevent fin rot or other health issues.

🧩 Temperament & Tank Mates

Japan Blue Double Sword Guppies are peaceful, active, and social fish that thrive in community aquariums.

• Temperament: Calm and non-aggressive

• Compatible Tank Mates:

  • Other guppy varieties

  • Mollies, platies, and swordtails

  • Tetras (neon, ember, rummy nose)

  • Corydoras catfish

  • Snails and shrimp (e.g., nerite or cherry shrimp)

• Avoid: Fin-nipping species like tiger barbs or large aggressive fish that may harass or bite their fins

Keep a ratio of 1 male to 2–3 females to minimize chasing and stress.

🍽️ Feeding Habits

Guppies are omnivores and thrive on a varied diet that enhances their color and vitality.

• Staple Diet: High-quality guppy or tropical flake food

• Supplementary Foods:

  • Live or frozen brine shrimp

  • Daphnia

  • Bloodworms (occasional treat)

  • Spirulina flakes for added nutrition

• Feeding Frequency: 2–3 small meals per day, only as much as they can consume within 2 minutes

A diverse diet keeps their blue hue vibrant and supports breeding health.

🌱 Care & Maintenance Tips

• Perform regular water changes and monitor water parameters

• Use a heater to maintain stable tropical temperatures

• Add live plants like Java moss, Anubias, or Hornwort for shelter and fry protection

• Keep the tank covered — guppies are known jumpers

• Breeding is straightforward; females give birth to live fry every 4–6 weeks

• Separate fry into a breeding box or nursery tank to prevent predation

💡 Why Choose the Japan Blue Double Sword Guppy?

• Eye-catching metallic blue coloration and elegant fin shape

• Hardy and easy to care for — ideal for beginners

• Compatible with most peaceful community species

• Brings color, movement, and personality to your tank

• Readily breeds in aquariums, allowing enthusiasts to raise their own fry

Transform your aquarium into a serene underwater showcase with the Japan Blue Double Sword Guppy — a timeless favorite for its elegance, color, and peaceful nature.