Apistogramma mcmasteri

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Apistogramma mcmasteri is a small South American dwarf cichlid native to Colombia, valued for its contrasting colors, territorial behavior, and remarkable parental care. Like other apistos, it inhabits shallow, slow-moving streams of the Orinoco drainage, where the bottom is often made up of sand, leaves, and woody debris. Successful care requires stable, clean, relatively soft water. With moderate availability in the aquarium trade, this species suits aquarists who want to observe the social behavior of a dwarf cichlid without keeping a large fish.

General description

Apistogramma mcmasteri is a dwarf cichlid in the genus Apistogramma, adapted to life close to the bottom in small tropical waterways. Like many apistos, it establishes territories around shelters and shows a clear hierarchy among individuals. The male generally occupies a larger area, while the female strongly defends a spawning site when breeding. At that time, her behavior becomes more assertive, although the species is not constantly aggressive. Successful care depends on well-maintained water, numerous hiding places, and a layout that breaks up the aquarium visually. It is best kept as a pair or in a carefully planned group, depending on tank size and the structure of the décor.

Geographic origin and habitat

The species comes from Colombia, in the río Meta drainage, part of the upper Orinoco basin. It is associated with small tributaries and lowland streams where the current is generally slow to moderate. The habitat includes shaded banks, roots, leaf litter, and dense riparian vegetation. The water may be soft and slightly acidic, with an amber tint when plant material releases tannins. In an aquarium, subdued lighting, wood, and leaf litter recreate this environment more effectively than a very open, brightly lit layout. A fine substrate also reduces the risk of injury when the fish sifts through the bottom.

Precise locality and local name

Apistogramma mcmasteri is mainly associated with waterways of the río Meta basin, around the Villavicencio region and the eastern foothills of the Colombian Andes. Commercial information may use varying names, especially when captive forms or similar populations are mixed. In the aquarium hobby, it is most often sold as McMaster’s Apisto or the red-shoulder apisto. To preserve the value of different lines, fish should be maintained according to their known origin, and crosses with similar apistos should be avoided.

Appearance and physical characteristics

Apistogramma mcmasteri has an elongated, laterally compressed body typical of small bottom-dwelling cichlids. The adult male is often yellow to golden brown, with dark markings and a red-orange area behind the head and across the shoulder. The dorsal and caudal fins may be extended and edged with blue, red, or orange tones depending on age, mood, and strain. The female is smaller and often becomes bright yellow during breeding, with a more contrasting dark pattern. Colors may fade under stress, poor water quality, or excessive competition. Differences between populations and captive-bred lines can make visual identification difficult.

General diet

Apistogramma mcmasteri is a small opportunistic carnivore that searches the substrate for tiny invertebrates and other aquatic organisms. Its diet should include varied, nutritious foods such as brine shrimp, bloodworms, daphnia, cyclops, and small frozen foods. High-quality sinking pellets may be accepted, but they should not be the only food offered. Feeding small portions several times a day reduces waste and allows females and subordinate fish to eat. Fry benefit from very fine foods offered regularly. Overfeeding should be avoided because uneaten food decomposes quickly in soft-water aquariums and can undermine water stability.

Essential data

• River of origin: Río Meta and associated small tributaries
• Local name used: McMaster’s Apisto; red-shoulder apisto
• Origin of the scientific name: Apistogramma is the genus name; macmasteri is a specific epithet formed from a personal name, McMaster
• Full-name etymology: Apistogramma comes from Greek and refers to an uncertain line or marking; macmasteri honors a person named McMaster
• Common/vernacular names: McMaster’s dwarf cichlid; McMaster’s Apisto; red-shoulder apisto
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: a-pis-to-GRAM-ma - mac-MAS-ter-i
• Discovery: Sven O. Kullander, 1979
• Maximum adult size: about 6 cm for the male; the female remains smaller
• Water temperature and pH: 24 to 29 °C; pH 5.5 to 7.0
• Stream appearance and surrounding vegetation: small shaded streams with roots, leaf litter, and dense riparian vegetation
• Typical tank companions: Hyphessobrycon columbianus, Hoplisoma metae, Otocinclus vestitus, Farlowella acus
• Temperament and behavior: peaceful outside the breeding period, territorial around shelters, and attentive to its offspring
• Water depth: generally shallow, often 0.2 to 1 m in small waterways
• Sexual dimorphism: male larger and more colorful, with more developed fins; female smaller and often yellow while breeding
• Bottom structure and flow: fine sand, light mud, leaves, and woody debris; slow to moderate flow

In your aquarium

Success with Apistogramma mcmasteri depends mainly on a structured layout, stable water, and a varied diet. Provide separate shelters formed by roots and leaves, a gentle substrate, and moderate water movement. Effective filtration, regular water changes, and a lightly stocked aquarium will support its health. During breeding, give the female enough space to defend her territory without constant disturbance. Under these conditions, this dwarf cichlid can display fascinating parental care and especially expressive coloration.