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Double Sword Japan Blue Fancy Guppies (**Poecilia reticulata** var. “Japan Blue Double Sword”) are a mesmerizing selectively bred variant of fancy guppies, treasured by aquarists for their intense, metallic sky-blue (or aquamarine-like) body coloration paired with the elegant double sword tail extensions that create a sleek, streamlined, and highly dynamic profile in the aquarium.

Unlike conventional delta or fan-tailed guppies, the Double Sword trait features a distinctly forked caudal fin with prominent, narrow upper and lower sword-like projections that extend gracefully backward, adding sophisticated movement and a sense of speed as the fish dart and display. High-grade Double Sword Japan Blue specimens exhibit a vibrant, uniform metallic blue that covers much of the body—often with a shimmering, almost electric iridescent quality that catches light beautifully—sometimes accented by subtle gold, yellow, or red highlights (as in Japan Blue Gold or Red variants) for added depth and contrast. The sword extensions in premium lines frequently carry matching blue tones or translucent edges, enhancing their refined, jewel-like appearance. Males display the most saturated blue intensity, boldest metallic sheen, and fullest sword development, while females in strong lines show softer blue-gray tones, rounder bodies, and moderate sword extensions.

These peaceful, spirited livebearers reach an adult size of about 1.5–2 inches (3.8–5 cm), with males typically smaller, more vividly colored, and dramatically finned compared to females. They have a lifespan of 2–3 years in optimal conditions and are active mid-to-upper level swimmers that bring constant energy, graceful fin flair, and eye-catching flashes of blue to the tank.

Double Sword Japan Blue Fancy Guppies are eager omnivores, happily grazing on algae, biofilm, and prepared foods while thriving on quality flakes, micro-pellets, and occasional live or frozen treats such as brine shrimp to support their stunning metallic color and fin condition. They’re prolific breeders in stable freshwater environments, often producing abundant fry that can inherit the signature Japan Blue hue and double sword traits with selective breeding.

Beginner-to-intermediate friendly, they perform best in community setups with stable water parameters (pH 6.8–7.8, temperature 72–82°F / 22–28°C), abundant live plants, decor for cover, and ample open swimming space to highlight their elegant sword tails. A varied, high-quality diet promotes vibrant coloration and robust health.
Overall, Double Sword Japan Blue Fancy Guppies are a premier choice for aquarists seeking cool, luminous metallic blues, sophisticated tail elegance, and lively aquatic presence in a freshwater tank — delivering exceptional visual brilliance with straightforward, enjoyable care.