Cichlasoma atratum

Lore & Background

The genus Cichlasoma was erected by Heckel in 1840 and has since absorbed dozens of species across the Neotropical freshwater fauna. It is one of the most species-rich cichlid genera, with members recorded from the Pacific slope of Mexico, the Caribbean slope, the Amazon, the Orinoco, and the La Plata basin. Many species are small to moderate in size, exhibit variable coloration, and occupy lotic (flowing-water) habitats as well as lentic (still-water) ones.

Historical ichthyological literature from the 19th and early 20th centuries is replete with binomials that have since been synonymized, re-described, or assigned to other genera (Herichthys, Geophagus, Astronotus, and others). The name 'atratum' fits within this pattern of early, sometimes provisional, nomenclature. Without access to a current FishBase, Catalog of Fishes, or GBIF record that I can cite with confidence, I refrain from asserting a type locality, holotype, or diagnostic character suite for this particular epithet.

In the aquarium trade, Cichlasoma species are generally recognized as hardy, adaptable freshwater cichlids that tolerate a range of water chemistries typical of Neotropical streams. However, specific husbandry parameters—temperature, pH, hardness, tank volume—vary by species and by the source cited, and no single set of values can be responsibly stated without naming the original publication.

Reader's Guide

General husbandry notes for Cichlasoma spp. are drawn from widely circulated Neotropical cichlid care literature (e.g., general Cichlidae husbandry chapters in standard freshwater-aquarium references). Because I cannot cite a specific peer-reviewed or trade publication for the exact species 'C. atratum,' the following is framed as genus-level guidance and should be verified against the primary description or a current FishBase/ITIS record before acting.

Substrate and flow: Many Cichlasoma species are lotic. A gently flowing setup (filter outflow directed across the tank) with fine sand or small gravel mimics a streambed. Avoid strongly alkaline, hard water unless the target species is known to prefer it; most Neotropical stream cichlids do well in soft-to-moderately hard, slightly acidic to neutral water (pH roughly 6.0–7.5, GH 4–12 dGH) per general Cichlidae husbandry consensus.

Temperature: A broad 24–28 °C range is commonly cited for Neotropical cichlids in general aquarist literature. Flag: do not treat this as a species-specific requirement without a cited source.

Common mistakes: (1) Overcrowding—Cichlasoma species are often territorial; ensure adequate hiding structure and spacing. (2) Feeding exclusively on high-protein pellets; supplement with live or frozen invertebrates to support coloration and gut health. (3) Ignoring water movement; stagnant setups stress lotic-adapted individuals.

Source attribution: The above reflects experienced-keeper consensus and general Cichlidae husbandry literature. No single peer-reviewed aquaculture paper is cited here; consult the species' original description and any subsequent revision before finalizing a husbandry protocol.

Did You Know?

• Cichlasoma is one of the most species-rich genera in the family Cichlidae, with members spanning from Mexico to the Paraná basin in South America.
• Many 19th-century Cichlasoma binomials have since been synonymized or moved to other genera (Herichthys, Geophagus, etc.), making historical names difficult to trace to a single living species.
• Neotropical stream cichlids often require gentle water flow to maintain gill function and mimic their natural lotic habitat—a detail frequently overlooked in still-water aquarium setups.
• The genus was originally described by Heckel in 1840, making it one of the earlier formalized cichlid genera in the Western taxonomic tradition.