Brashnikov's Lyretail (Simpsonichthys boitonei) — 3-4cm

Overview

The Brashnikov's Lyretail (Simpsonichthys boitonei), also known as the Brasília Lyrefin, is a rare, beautifully patterned Brazilian annual killifish endemic to Brazil, likely the Brasília region of central Brazil. Reaching 3-4cm in length, this peaceful species is prized for its lyretail shape and specialized breeding behavior. As an annual killifish adapted to temporary habitats that dry seasonally, Simpsonichthys boitonei has a compressed life cycle and unique reproductive strategy. Available for sale UK from Tropical Fish Co, this rare species rewards experienced aquarists with spectacular finnage and captivating behaviour.

Appearance and Coloration

Brashnikov's Lyretail displays stunning colouration with a slender, elegant body adorned in intricate patterns of blue, green, red, and yellow with pearl-like iridescent spots scattered across the scales. The most distinctive feature is the lyre-shaped caudal fin with elongated rays that create a graceful, flowing silhouette. Males are intensely coloured with pronounced lyretail finnage and a bold presence, especially during courtship. The fins feature intricate patterning and iridescent highlights that shimmer under subdued lighting. Females are smaller, plumper, and more subdued in colour with shorter finnage.

Natural Habitat

Simpsonichthys boitonei is endemic to Brazil, likely the Brasília region of central Brazil, where it inhabits seasonal freshwater pools and temporary water bodies. These habitats fill with water during the wet season and dry completely during the dry season. The water is typically soft, slightly acidic, and well-vegetated, with a substrate of mud and organic debris. During the wet season, adults spawn rapidly; as pools dry, adults perish while eggs remain dormant in dried substrate, hatching when rains return months later.

Aquarium Setup

A minimum 40-litre aquarium is recommended for a pair or small group of Brashnikov's Lyretail. Use a fine sand or soft peat substrate to replicate the natural spawning medium. Include live plants such as Cryptocoryne, Java moss, and floating species like Salvinia or Limnobium. Provide spawning mops or peat moss for egg deposition. Lighting should be subdued, and filtration gentle to avoid strong currents. A secure, tight-fitting lid is essential. Maintain excellent water quality, as annual killifish are sensitive to pollution and poor conditions.

Feeding and Diet

As a carnivore, Simpsonichthys boitonei requires a varied, protein-rich diet to maintain health and colour. Offer small live and frozen foods such as daphnia, brine shrimp, mosquito larvae, grindal worms, and other tiny meaty foods daily. High-quality micro pellets may be accepted in some cases after acclimation. Live and frozen foods are essential for conditioning and breeding. Feed small portions twice daily, removing uneaten food promptly to maintain pristine water quality. Variety and freshness are critical for optimal health and vibrant colouration.

Behaviour and Temperament

Brashnikov's Lyretail is a peaceful species that spends most of its time exploring the lower and middle water column. Males may display to each other during courtship with flared fins and vibrant colour displays, showcasing their distinctive lyretail finnage. Serious aggression is rare. These fish have a naturally short lifespan of typically 6-12 months, reflecting their annual biology. They appreciate a dimly lit aquarium with plenty of cover. They are not competitive feeders, so avoid housing them with boisterous or fast-moving species.

Suitable Tank Mates

Simpsonichthys boitonei is best kept species-only to accommodate its unique breeding biology and short lifespan. Other small, calm annual killifish may be suitable only if tank size and breeding goals allow. Avoid large fish, aggressive fish, fast competitive feeders, fin-nippers, and community tank species that require long-term stable mixed conditions. A calm, quiet environment is essential for this delicate annual killifish to thrive.

Breeding

This annual killifish typically lays eggs in substrate. Condition a pair or small group with high-quality live foods, then provide spawning media such as peat moss or fine sand. Eggs often require a drying/incubation period before hatching. Breeding success depends on precise water conditions, seasonal simulation, and careful egg management. Collect eggs carefully and store in slightly damp peat in a sealed container. Fry hatch when the peat is re-flooded and require infusoria or newly hatched brine shrimp. Remove adults to prevent egg predation.

Why Buy from Tropical Fish Co

Tropical Fish Co is a trusted UK supplier of rare and specialist tropical fish, including hard-to-find annual killifish species like Simpsonichthys boitonei. We guarantee healthy, well-conditioned stock, expert care advice, and secure nationwide delivery. Every fish is quarantined and inspected before dispatch, ensuring you receive only the finest specimens. Whether you're setting up a dedicated killifish tank or adding a rare species to your collection, Tropical Fish Co offers unmatched quality and customer service. Order online today and experience the beauty of Brazilian annual killifish.