Magnificius Pearl Fish (Cynolebias magnificus) — 2,5-3cm

Overview

The Magnificius Pearl Fish (Cynolebias magnificus) is a rare, beautifully patterned annual killifish native to seasonal freshwater habitats in South America, especially Brazil. Reaching just 2.5cm in length, this semi-aggressive species is prized for its striking color and fascinating breeding behavior. As an annual killifish adapted to temporary habitats that dry seasonally, Cynolebias magnificus has a compressed life cycle and unique reproductive biology. Available for sale UK from Tropical Fish Co, this rare species rewards experienced keepers with captivating displays and unique breeding challenges in species-only aquariums.

Appearance and Coloration

The Magnificius Pearl Fish displays stunning colouration with a compact, slender body adorned in vivid blues, greens, reds, and yellows with pearl-like iridescent spots scattered across the scales—living up to its magnificent name. Males are intensely coloured with pronounced finnage and a bold presence, especially during courtship. The scales shimmer with a metallic lustre under subdued lighting. Females are smaller, plumper, and more subdued in colour with shorter finnage. In a planted tank with dark substrate, the colours and pearly spots become even more vibrant and eye-catching.

Natural Habitat

Cynolebias magnificus inhabits seasonal freshwater habitats in South America, especially Brazil. These temporary water bodies 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. This annual life cycle is fundamental to the species' biology.

Aquarium Setup

A minimum 20-litre aquarium is sufficient for a pair or small group of Magnificius Pearl Fish. 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 to prevent jumping. Maintain excellent water quality, as annual killifish are sensitive to pollution and stress.

Feeding and Diet

As a carnivore, Cynolebias magnificus requires a varied, protein-rich diet to maintain health and colour. Offer small live and frozen foods such as bloodworms, daphnia, brine shrimp, and other meaty microfoods daily. Many individuals may need live foods to thrive and condition for breeding. Feed small portions twice daily, removing uneaten food promptly to maintain pristine water quality. Variety and freshness are critical for optimal health and maintaining the magnificent colouration.

Behaviour and Temperament

The Magnificius Pearl Fish is a semi-aggressive species that spends most of its time exploring the lower and middle water column. Males can be territorial towards each other, especially during courtship and spawning, with displays of flared fins and bold colour. Serious aggression is usually limited to conspecifics. 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 and territorial boundaries.

Suitable Tank Mates

Cynolebias magnificus is best kept species-only to accommodate its unique breeding biology and territorial nature. Other small, calm annual killifish may be suitable only if tank size and temperament allow. Avoid large fish, fast or boisterous fish, fin-nippers, aggressive cichlids, and shrimp or very small invertebrates that may be eaten. A calm, quiet environment is essential for this delicate annual killifish to thrive.

Breeding

Like many annual killifish, breeding is typically done by providing a peat or fine spawning medium for egg deposition. Condition a pair or small group with high-quality live foods, then provide spawning media such as peat moss or fine sand. Eggs are often removed and incubated in moist substrate before hatching when water is reintroduced. 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. Breeding success depends on careful egg management and matching seasonal conditions.

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 Cynolebias magnificus. 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 magnificent beauty of South American annual killifish.