Description
Species Overview
The Blue Mosaic Guppy (Poecilia reticulata) is a selectively bred fancy guppy variety recognized for the intricate mosaic-style patterning that develops across the fins, particularly the large caudal fin of mature males. Blue coloration provides the foundation for the strain, while the branching, irregular markings characteristic of Mosaic guppies create a more complex appearance than solid-colored varieties.
Males typically display the strongest coloration and most developed finnage, while females grow larger and have a fuller body shape with more restrained coloration. Like other fancy guppies, Blue Mosaic Guppies are active, social livebearers that spend much of their time swimming and foraging through the upper and middle levels of the aquarium.
Our Blue Mosaic Guppies are Tank Bred and available as males, females, or pairs. They combine the elaborate appearance associated with Mosaic guppies with the active behavior, manageable size, and approachable husbandry that have made Poecilia reticulata one of the most widely kept freshwater aquarium fish.
What We Love About This Fish
Distinctive Mosaic Patterning: Blue Mosaic Guppies combine blue coloration with the intricate, irregular fin patterning that gives Mosaic-type guppies their name.
Impressive Male Finnage: Mature males develop the larger, more elaborate caudal and dorsal fins associated with selectively bred fancy guppies.
Constant Aquarium Activity: Blue Mosaic Guppies are active throughout the upper and middle water column, bringing continuous movement to planted and community aquariums.
Tank-Bred Fancy Guppy: Our Blue Mosaic Guppies are Tank Bred and available as males, females, or pairs for display aquariums or breeding projects.
Quick Care Guide
Scientific Name: Poecilia reticulata
Common Name: Blue Mosaic Guppy
Source: Tank Bred
Average Purchase Size: Approximately 1–1.5 inches; size varies by age and sex
Adult Size: Males typically reach approximately 1.5–2 inches, while females commonly reach approximately 2–2.5 inches
Care Level: Easy. Blue Mosaic Guppies are adaptable, but consistent water quality and adequate mineral content remain important for long-term health.
Temperament: Peaceful. Blue Mosaic Guppies are appropriate for planted and community aquariums with non-aggressive species that thrive under similar water conditions.
Diet: Omnivore. Offer a varied diet built around quality prepared foods and supplemented with appropriately sized live, frozen, and plant-based foods.
Social Behavior: Social and active. Blue Mosaic Guppies interact frequently with other guppies but do not form the tightly coordinated schools characteristic of many tetras and rasboras. Males regularly display and court females.
Activity Level: Active
Aquarium Level: Upper to middle water column
Minimum Aquarium Size: 10 gallons; larger aquariums provide greater water stability and more swimming space, particularly for groups and breeding populations.
Lifespan: Approximately 2–3 years, although genetics, temperature, nutrition, reproductive demands, and overall husbandry influence individual lifespan.
Aquatic Arts Tip
Blue Mosaic Guppies are adaptable, but adaptable does not mean indifferent to water quality. Stable, mineral-rich water and consistent aquarium maintenance are more important than repeatedly adjusting the aquarium to chase an exact pH or hardness number.
Recommended Water Parameters & Aquarium Requirements
Water Parameters
Temperature: 72–82°F (22–28°C)
pH: 7.0–8.2
GH: 8–18 dGH
KH: 4–12 dKH
Ammonia: 0 ppm
Nitrite: 0 ppm
Nitrate: Ideally maintained below 20 ppm through appropriate stocking, feeding, filtration, and regular water changes
Aquarium Requirements
Minimum Aquarium Size: 10 gallons. Larger aquariums provide greater water stability and are strongly recommended for larger groups, community setups, or aquariums where fry will be allowed to grow.
Filtration: Use reliable biological and mechanical filtration sized appropriately for the aquarium. Sponge filters are particularly useful in breeding setups because they provide biological filtration without creating dangerous intake suction for newborn fry.
Water Flow: Low to moderate. Blue Mosaic Guppies are active swimmers but do not require strong current, and excessive flow can become unnecessarily demanding for fancy guppies with developed finnage.
Oxygenation: Maintain good gas exchange through appropriate filtration, surface movement, or supplemental aeration when necessary.
Aquarium Maturity: A fully cycled aquarium is required. Blue Mosaic Guppies should never be used to cycle a new aquarium.
Plants: Highly recommended. Live plants provide cover, grazing surfaces, visual barriers, and refuge for fry while contributing to a more biologically active aquarium.
Lighting: Low to moderate lighting is suitable for the fish themselves. Choose lighting intensity primarily around the requirements of the live plants being maintained.
Aquatic Arts Tip
Stability matters more than chasing a perfect number. Blue Mosaic Guppies thrive in moderately hard, mineral-rich water, but repeatedly adjusting pH or hardness can create more stress than maintaining stable conditions within an appropriate range. Test your source water, understand what comes from your tap, and build your husbandry around consistency.
