Acarichthys heckelii var.

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Acarichthys heckelii var., also called Albinos Threadfin, is an albino variety of the Threadfin Acara, a South American cichlid associated with the calm waters of the Amazon basin. Its elegant profile, elongated pelvic fins and pale coloration give it a striking presence in a large aquarium. Like the standard form, it is a bottom-oriented and midwater fish that appreciates fine substrates, shelter and warm, clean water. This variety remains uncommon in the aquarium trade, and the specimens described for this profile are listed as wild-collected according to the information provided.

General species description

Acarichthys heckelii var. is a medium to large South American cichlid. The albino variety retains the general shape of the species: a deep, laterally compressed body, a sturdy head and extended dorsal and anal fins. Despite its imposing appearance, it is generally peaceful when kept with similarly sized tankmates in a sufficiently spacious aquarium. It may still defend a territory, especially during spawning. Its behaviour combines calm cruising with active foraging through the substrate. It should not be treated as a strict earth-eater: it may sift sand, but it also uses the middle areas of the aquarium. Albino specimens are more comfortable under subdued lighting, with shaded areas available. Its commercial rarity is intermediate, making it a specialized cichlid rather than a common community fish.

Geographical origin and biotope

The wild form is associated with the Brazilian Amazon basin, especially floodplains, side lakes and slow-flowing tributaries. The biotope usually has warm, soft to moderately mineralized water, with visibility that varies according to season and organic matter. Banks may contain submerged vegetation, roots and fallen branches, while the bottom consists of sand, mud or fine sediment mixtures. In an aquarium, these conditions can be approached with a large tank, non-abrasive sand, roots and open shelters. Filtration should be effective without producing excessive current. Because the fish in this profile are identified as wild-collected, careful acclimation, quarantine and gradual dietary diversification are particularly sensible practices.

Precise locality and local name

In aquarium literature and commerce, the species is generally linked to the Amazon and Brazil rather than to one consistently used locality. The Portuguese name acará may be used locally for several cichlids, but it is not always exclusive to this species. In English, Threadfin Acara refers to the thread-like extensions of the pelvic fins. Albinos Threadfin simply describes the variety presented here. For aquarists, the names Acarichthys heckelii var. and Albinos Threadfin are practical ways to avoid confusion with smaller acaras or certain eartheaters. An origin listed only as Brazil is still useful for establishing broad parameters, but the aquarium should mainly reproduce a calm Amazonian environment rather than imitate one specific site.

Appearance and physical characteristics

The body of Acarichthys heckelii var. is oval, fairly deep and laterally compressed. The albino variety has very little pigmentation: the body usually appears cream-white to pinkish, and the eyes are often red or pink. This coloration highlights the thread-like pelvic fins that explain the common name Threadfin. In the normal form, the body and fins may show brown, golden or reddish tones, but these contrasts are greatly reduced in albino fish. The dorsal and anal fins are extended, giving the fish an elegant outline. Adult size requires a substantial aquarium, as a mature specimen may reach approximately 20 cm. Juveniles are less impressive and may look pale; their appearance becomes more defined as they grow and receive a varied diet.

General diet

Acarichthys heckelii var. is an omnivore and benefits from a varied diet. In nature, it feeds on small invertebrates, larvae, crustaceans, organic debris and some plant material or periphyton collected while foraging near the bottom. In the aquarium, the staple diet can consist of quality sinking pellets, supplemented with frozen foods such as brine shrimp, mysis, bloodworms and small crustaceans. Vegetable-based tablets or sinking foods may also be offered, but should not become the only food. Meals should remain moderate to limit waste, especially with a fish of this size. For wild specimens, begin with attractive foods and gradually increase variety. Distribute food in several areas to reduce competition and give shy individuals a fair opportunity to feed.

Essential data

• Native river: Amazon basin; several Brazilian waterways are associated with the species.
• Local name used: Acará.
• Origin of the scientific name: The genus combines acará with the Greek ichthys, fish; heckelii honours Johann Jakob Heckel.
• Etymology of the full name: Acarichthys means acará fish; heckelii means dedicated to Heckel.
• Common/vernacular names: Albinos Threadfin, Threadfin Acara, acará.
• Family: Cichlidae.
• Subfamily: Cichlinae.
• Name pronunciation: ah-kah-RIK-this HEK-el-ee.
• Discovery: Johannes Peter Müller and Franz Hermann Troschel, 1849.
• Maximum adult size: Approximately 20 cm.
• Water temperature and pH: 24 to 30 °C; approximately pH 5.5 to 7.5.
• Waterway appearance and surrounding vegetation: Slow water, floodplain habitats, roots, branches and marginal vegetation.
• Typical tankmates: Biotodoma cupido, Geophagus altifrons, Mesonauta festivum, Uaru amphiacanthoides, Corydoras agassizi.
• Temperament and behaviour: Generally peaceful, territorial when spawning, active near the bottom and décor.
• Water depth: Littoral areas and floodplains; variable depth.
• Sexual dimorphism: Limited outside spawning; adult males may be larger and have more developed fins.
• Bottom and flow: Sand or fine sediment with roots and plant debris; slow to moderate flow.

For greater success

To keep Acarichthys heckelii var. successfully, provide a spacious aquarium, warm and stable water, and a fine sand substrate that allows natural foraging without damaging the fins. Roots, sturdy plants and shaded areas help reduce stress in the albino variety. Strong biological filtration, regular water changes and quarantine for wild-collected fish are essential. Choose peaceful tankmates that are large enough not to be swallowed and that tolerate similar Amazonian conditions. A varied diet and close observation during acclimation complete the key conditions for long-term success.