Male lyretail guppy

The male lyretail guppy (Poecilia reticulata) is a highly popular, vibrant freshwater aquarium fish famous for its distinctive lyre-shaped tail fin. It is an exceptionally hardy, peaceful, and active species, making it a perfect choice for beginner aquarists. Unlike females, males display intense, diverse coloration patterns—ranging from neon blues and greens to rich reds and yellows—acting almost like a unique fingerprint for each individual fish.

Physical Characteristics & Identification

The Lyretail: The defining feature is the tail fin layout, where the upper and lower rays extend outwards further than the center, forming a dual-pointed, fork-like appearance resembling a traditional musical lyre.
Size: Males are noticeably smaller than females, typically growing to 1.2 to 2.5 inches (3 to 6 cm) in length.
Sexing: Aside from brighter colors and longer fins, males possess a gonopodium—a modified, long, thin pointy anal fin used for reproduction.

Quick Care Sheet

Parameter	Recommended Level
Minimum Tank Size	10 Gallons (40 Liters)
Water Temperature	74°F to 82°F (23°C to 28°C)
Water pH	6.8 to 8.0 (Prefers slightly alkaline)
Water Hardness	8 to 15 dGH (Moderately hard)
Diet	Omnivore (Flakes, pellets, brine shrimp, bloodworms)

Tank Setup & Behavior
- Environment: Provide a well-planted aquarium utilizing live flora like Java moss or hornwort, which gives them security and helps maintain pristine water conditions.
- Aquarium Lid Required: Lyretail guppies are active swimmers across all levels of the water column and are known jumpers; a secure tight-fitting lid or canopy is highly recommended.
- Filtration: Use a gentle filtration option like a sponge filter or a baffled hang-on-back filter. Strong, turbulent currents can easily exhaust their delicate, elongated fins.
- Tank Mates: Keep them with peaceful community fish (e.g., neon tetras, corydoras, or ghost shrimp). Strictly avoid fin-nipping species like Tiger Barbs, which will shred the guppy's trailing tail extensions.
- Stocking Ratios: If keeping a mixed-sex tank, maintain a strict ratio of 2–3 females for every 1 male. This distributes the male's constant mating drive and prevents individual females from suffering lethal stress.