Taxonomy & naming
Amazonichthys lindeae was described by the Belgian-French ichthyologist Jacques Géry in 1973. Eschmeyer's Catalog of Fishes (CAS) records the valid name as Amazonichthys lindeae (Géry, 1973), with parenthetical authority indicating the species was originally placed in a different genus before being transferred to Amazonichthys. The species is assigned to the subfamily Aphyocharacinae within Characidae — a grouping that includes several similarly small, often semi-translucent tetras sometimes collectively called glass tetras.
The genus Amazonichthys currently contains two species: A. lindeae and A. camelierae. The two are distinguished by the pattern of the midlateral stripe: in A. lindeae the stripe reaches anteriorly into the dorsal-fin region, whereas in A. camelierae it extends posteriorly to the caudal peduncle blotch. FishBase notes A. lindeae under its former combination Axelrodia lindeae, reflecting an earlier generic placement. The Catalog of Fishes remains the governing authority for the valid name.
Morphology
Amazonichthys lindeae is a very small fish, reaching approximately 1 in in standard length. Like other Aphyocharacinae, it is laterally compressed and relatively translucent, with the typical slender tetra body plan.
The most diagnostic external feature is the midlateral stripe, which in this species reaches the dorsal-fin region — not extending back to the caudal peduncle blotch as in the sister species A. camelierae. Beyond this stripe character, detailed morphological data for the species in the published literature are sparse; as with many microcharicinids described in the 1970s, the original description is the primary reference. The overall appearance is likely typical of small Aphyocharacinae: a translucent to silvery body, a dark lateral band, and small fins.
Habitat
Amazonichthys lindeae is recorded from the lower Amazon basin in Brazil. The lower Amazon encompasses a mosaic of aquatic habitats — main-channel margins, floodplain lakes (várzeas and igapós), small tributaries, and blackwater streams — that vary considerably in temperature, pH, and conductivity depending on whether the water is white (nutrient-rich, near-neutral) or black (tannin-stained, acidic, very soft).
No habitat-specific field data for A. lindeae appear in the available literature. Its assignment to Aphyocharacinae and its lower-Amazon origin suggest it likely inhabits shallow, vegetated marginal or floodplain water. Aquarium parameters for related small Aphyocharacinae typically call for soft, acidic to neutral conditions consistent with Amazonian blackwater or clearwater environments, though this should be treated as inference from family context rather than confirmed species data.
Feeding
No diet data specific to Amazonichthys lindeae appear in the available sources. As a small Aphyocharacinae from the Amazon basin, it most likely feeds on tiny invertebrates — microcrustaceans, insect larvae, zooplankton — and perhaps small amounts of plant material or algae, consistent with the opportunistic omnivory typical of small Characidae.
In a home aquarium, similarly sized small tetras are typically fed a varied diet of high-quality micro-pellets or finely ground flake alongside frozen or live small live foods such as micro-worms, Artemia nauplii, and Daphnia. Given its small maximum size (~1 in SL), food particle size matters: large flakes will be ignored or wasted.
Mating
No published observations of mating behaviour specific to Amazonichthys lindeae are on record. Based on family-level patterns in Aphyocharacinae and Characidae broadly, the species is presumed to be an egg-scattering, open-water or fine-leaved-plant spawner with no parental care — the ancestral characid reproductive mode.
If courtship follows the pattern of related small tetras, males likely chase and display to females among fine vegetation or spawning substrate, with fertilisation external and eggs scattered or adhered loosely. Conditioning with live foods and water-quality fluctuations that mimic the onset of the rainy season (slight drop in temperature, pH, and hardness) tend to trigger spawning in comparable Amazonian characids, but no A. lindeae-specific protocol has been documented.
Breeding
No confirmed breeding records for Amazonichthys lindeae in captivity appear in the hobby literature or research cache. Given its rarity in the trade, deliberate captive breeding attempts have apparently not been documented publicly.
By analogy with other small Aphyocharacinae, spawning would be expected over fine-leaved plants or spawning mops, with adhesive or semi-adhesive eggs. Adults of small egg-scattering characids typically consume their own eggs, so separating eggs or adults immediately after spawning would be standard practice. Fry of very small tetras require correspondingly fine first foods — infusoria and rotifers before graduating to nauplii. All breeding details for this species remain speculative pending direct observation.
In the aquarium
Amazonichthys lindeae is rarely available in the ornamental-fish trade and has not established a presence in hobbyist literature comparable to more common small tetras. No dedicated care page on major hobbyist reference sites was located for this species during research.
By inference from its size and Aphyocharacinae affinity, it would best be maintained in a small, well-planted aquarium — a nano or species tank of 10–15 US gal — with soft, slightly acidic to neutral water, subdued lighting, and gentle filtration. A group of six or more individuals is preferable to reduce individual stress. Tankmates, if any, should be similarly tiny and non-aggressive. Fine-leaved plants and dark substrate would show off the fish's translucent colouration and mirror probable natural microhabitat. Attention to water quality is critical given the species' small body mass and likely sensitivity to dissolved wastes.
Conservation
Amazonichthys lindeae has not been assessed by the IUCN Red List; it carries no formal conservation status as of 2026. As a species confined to the lower Amazon basin of Brazil, it falls within a broadly biodiverse but increasingly pressured region. Amazonian freshwater biodiversity faces ongoing threats from deforestation, agricultural runoff, dam construction, and climate-related hydrological changes.
The species' obscurity in the trade and lack of targeted research mean that even its current abundance and precise distribution within the lower Amazon are unknown. No specific conservation measures are in place. A formal assessment under IUCN criteria would require field surveys to establish range, population size, and habitat trends. Until then, its status remains effectively data-deficient even if officially unevaluated.