Foersch's Nothobranch (Nothobranchius foerschi) — 2,5-3,5cm

Overview

The Foersch's Nothobranch (Nothobranchius foerschi) is a striking, short-lived Tanzanian annual killifish endemic to Tanzania, where it inhabits temporary seasonal pools. Reaching just 3cm in length, this semi-aggressive species is prized for its vivid colors, fascinating life cycle, and rewarding breeding behavior. As an annual killifish adapted to temporary habitats that dry seasonally, Nothobranchius foerschi has a compressed life cycle and unique reproductive biology. Available for sale UK from Tropical Fish Co, this rare species rewards experienced aquarists with spectacular displays and captivating behaviour.

Appearance and Coloration

Foersch's Nothobranch displays stunning colouration with a compact, robust body adorned in vivid blues, reds, and oranges with intricate patterning and iridescent highlights. Males are intensely coloured with pronounced finnage and a bold presence, especially during courtship. The body features spectacular metallic scales that shimmer under subdued lighting. Females are smaller, plumper, and more subdued in colour with shorter finnage. In a planted tank with dark substrate, the colours become even more vibrant and eye-catching.

Natural Habitat

Nothobranchius foerschi is endemic to Tanzania, where it is associated with temporary seasonal pools. 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 to neutral, 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 Foersch's Nothobranch. 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 stress.

Feeding and Diet

As a carnivore, Nothobranchius foerschi requires a varied, protein-rich diet to maintain health and colour. Offer small live and frozen foods such as daphnia, brine shrimp, mosquito larvae, and other tiny meaty foods daily. Quality micro-pellets or granules may be accepted, but live and frozen foods are best for condition 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

Foersch's Nothobranch 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

A species-only setup is recommended for Nothobranchius foerschi to accommodate its unique breeding biology and territorial nature. If kept in a community, only with very peaceful, similarly sized fish in a larger tank may be suitable, but this is not ideal. Shrimp are not recommended, especially in breeding setups. Avoid large fish, fast or boisterous species, fin-nippers, aggressive fish, and other annual killifish males in cramped quarters. A calm, quiet environment is essential for this annual killifish to thrive.

Breeding

This annual killifish lays eggs in peat or fine spawning media. Condition a pair or small group with high-quality live foods, then provide spawning media such as peat moss or fine sand. Eggs usually require a drying/incubation period before hatching. Successful breeding depends on careful collection, storage, and re-flooding of eggs after several weeks to months. Fry are tiny and require infusoria or newly hatched brine shrimp. Breeding success depends on careful egg management, frequent small feedings, and excellent water quality. 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 Nothobranchius foerschi. 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 Tanzanian annual killifish.