Blue

In blue fancy guppies, the selected feature is blue sheen, blue fin color, or a combination of both on Poecilia reticulata. The effect may come from iridescent cells layered over darker pigment, which is why one fish can look steel, turquoise, royal blue, or violet as it turns in the light. Blue Moscow, neon blue, blue grass, and blue dragon are familiar strain names, but the label does not guarantee a single genetic background. Males normally show the deepest coverage; females may carry only a faint body wash or colored fin edging.

Blue lines are often kept separate because crossing unrelated strains can produce gray, greenish, black, or uneven offspring instead of stronger blue. A dark background, steady water quality, and varied food help the color read well without forcing fish under intense lighting. For community tanks, choose calm companions and avoid rough filter flow that damages long fins. When buying, view the fish from the side and at rest, since some blue guppies flash their best color only during quick turns.

Colors: Albino, Bicolor, Blue, Cobra, Dragon, Dumbo Ear, Endler, Grass, Green, Half-Black, Japan Blue, Koi, Leopard, Metal, Mosaic, Moscow, Multicolor, Neon Blue, Platinum, Red, Snakeskin, Solid, Tuxedo, Wild Type, Yellow