Heros notatus

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Introduction

Heros notatus, also called the Guyana Red-Spotted Severum, is a South American cichlid sought after for its spotted coloration and expressive behavior. Native to the Rio Corantijn in Guyana, it remains a very rare fish in the aquarium trade. Its body shape recalls that of classic severums, but its red spots and variable pattern give it a distinct identity. This wild species is best suited to experienced aquarists who can provide a large aquarium, soft and stable water, and a structured layout with territories and shelter. Its rarity makes it especially interesting for dedicated South American aquarium collections.

General species description

Heros notatus is a deep-bodied, laterally compressed cichlid belonging to the family Cichlidae. It shows the typical behavior of South American cichlids: it actively explores its surroundings, defends an area, and may become more territorial during breeding. Despite its robust appearance, it is generally less aggressive than several large predatory cichlids. It still requires plenty of space, effective filtration, and excellent water quality. The species is considered very rare in the aquarium hobby, increasing its value among collectors. The fish offered here originate from wild collection and may therefore require slower acclimation than captive-bred fish. In Canada, this form is offered exclusively by Ton.Fish, making it an uncommon choice for a regional South American aquarium.

Geographic origin and biotope

The species comes from Guyana, in the basin of the Rio Corantijn, an important waterway of the Guianan region. It inhabits forested areas where the current is generally slow to moderate, including margins, quiet bays, and areas influenced by plant debris. The water is often soft, slightly acidic, and colored by organic matter from the surrounding forest. Natural habitats include roots, submerged branches, leaf litter, and sandy or muddy patches. Dense vegetation along the banks provides shade, while fallen wood creates visual barriers between fish. To recreate this environment, use moderate lighting, driftwood, hiding places, and fine substrate. A suitable aquarium should also retain open areas for swimming and territorial behavior.

Precise location and local name

The reference population is associated with the Rio Corantijn, which forms much of the boundary between Guyana and Suriname. In the aquarium trade, the most commonly used name is Guyana Red-Spotted Severum. The French description red-spotted Guyana severum refers to its presumed origin and main visual feature, but the English name remains the most practical identification in import lists. Geographic locality matters because Heros populations may differ in pattern, coloration, and behavior according to the drainage they inhabit. For this reason, locality information should be kept with the fish, and different Heros forms should not be mixed without proper records. The Corantijn locality gives Heros notatus special value for aquarists interested in wild fish and clearly identified geographic lines.

Appearance and physical characteristics

Heros notatus has an oval, tall, laterally compressed body, with a long dorsal fin and a well-developed anal fin. The base color ranges from olive gray to greenish brown, often highlighted by reddish or orange spots on the flanks and fins. Vertical bars may appear or become stronger depending on mood, surroundings, and social rank. The head is relatively massive, with a terminal mouth suited to grazing and taking small foods. The unpaired fins may show red, yellow, or brown tones. As with several severums, adult appearance changes considerably with age and condition. Mature males often develop longer fins and stronger coloration, although visual sexing remains difficult in young fish. An adult length of about 20 cm should be considered when planning the aquarium, with extra room for swimming and territory formation.

General diet

In nature, Heros notatus feeds mainly on plant matter, algae, organic debris, small invertebrates, and other foods found while inspecting the substrate and submerged surfaces. Its diet is therefore omnivorous with a herbivorous tendency. In the aquarium, the staple should be quality pellets for herbivorous or omnivorous cichlids, supplemented with foods containing vegetables such as spirulina, peas, zucchini, or blanched spinach. Frozen foods such as brine shrimp, daphnia, or bloodworms can be offered as supplements, but should not make up most meals. An overly protein-rich diet may promote excess weight and digestive problems. Small portions offered regularly are preferable to one large feeding. Fresh vegetables also help reproduce its natural grazing behavior. Remove leftovers promptly to maintain stable water with low waste accumulation.

Essential data

• Native river: Rio Corantijn
• Local name used: Guyana Red-Spotted Severum
• Origin of the scientific name: The genus Heros was assigned to severum-type cichlids; the species was described in South American taxonomic literature.
• Full-name etymology: Heros comes from the Greek word for hero, while notatus comes from the Latin notatus, meaning marked or bearing markings.
• Common/vernacular names: Guyana Red-Spotted Severum; red-spotted Guyana severum.
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: heh-ross - no-tah-tuss
• Discovery: Johann Jakob Heckel, 1840
• Maximum adult size: About 20 cm
• Water temperature and pH: 24 to 30 °C; pH 5.5 to 7.5
• Waterway appearance and surrounding vegetation: Forested waterway, often organically tinted soft water, submerged wood, leaves, roots, and dense streamside vegetation.
• Typical tankmates: Mesonauta guyanae, Guianacara sphenozona, Hoplosternum littorale, Hypostomus plecostomus
• Temperament and behavior: Generally peaceful to moderately territorial; more defensive as a pair and during breeding.
• Water depth: Shallow to intermediate marginal areas, with shelter formed by roots and fallen wood.
• Sexual dimorphism: Adult males may be larger, with more developed fins and stronger coloration; young fish are difficult to sex visually.
• Bottom structure and flow: Sandy or muddy bottom covered with plant debris; slow to moderate flow depending on the area.

For greater success

Success with Heros notatus depends on a spacious aquarium, reliable filtration, and soft water kept free from sudden changes. Provide a layout with roots and hiding places while preserving open swimming space. A varied, plant-rich diet offered in moderate portions helps maintain good condition. Because this form is very rare and comes from wild fish, acclimation, quarantine, and observation during the first weeks are especially important. Avoid aggressive or very small tankmates, particularly once a pair begins defending a territory.