Taxonomy & naming
Peckoltia braueri was described by Carl H. Eigenmann in 1912 in the Memoirs of the Carnegie Museum (volume 5, number 1, page 232, Plate 28, figures 1–2) under the original combination Hemiancistrus braueri, based on a holotype (ZMB 3174, the larger specimen) and a paratype collected from the Takutu River, Guyana. Ferraris (2007) catalogued the type specimens; the holotype is held in the Zoological Museum of Berlin.
The Catalog of Fishes (Eschmeyer, CAS, updated June 2026) gives the current valid name as Peckoltia braueri (Eigenmann 1912). The transfer from Hemiancistrus to Peckoltia was formalised by Isbrücker (2001, 2002) and subsequently confirmed by Fisch-Muller (in Reis, Kullander & Ferraris 2003), Armbruster & Werneke (2005), Armbruster (2008, 2015), and multiple subsequent checklists. The earlier combination Hemiancistrus braueri is now treated as a synonym.
In the DATZ L-number system the species was independently coded as L121 (the primary reference number used by PlanetCatfish), L135, and L305 — three separate photocodes assigned to the same taxon before its identity was resolved. The genus Peckoltia honours Gustavo Peckolt, a member of the Natural History Commission of Rondon; the epithet braueri is an eponym for the collector (or a person of that surname in Eigenmann's network — the precise dedicatee is not specified in the original description).
Morphology
Adults reach approximately 5 in standard length (SL), making Peckoltia braueri a medium-sized loricariid — larger than the dwarf cave-plecos but substantially smaller than the large Pterygoplichthys and Hypostomus that dominate the mass trade. The body is covered in overlapping bony scutes; the overall body shape is typical of Peckoltia — moderately depressed, broadest just behind the head, tapering to a moderately forked caudal fin.
Ground colour is pale tan to ochre-brown, overlaid with a complex dark-brown pattern of interlocking worm-track lines and reticulations — the markings that give the species its hobby name 'Worm-Line Peckoltia'. The pattern is variable between individuals and populations; fish from the upper Negro and Branco drainages may differ in contrast and line arrangement from those from the Takutu type locality. The fins — dorsal, pectoral, and caudal — carry corresponding spotted or banded markings.
Sexual dimorphism is expressed in the typical Peckoltia manner: adult males develop small, fine odontodes on the pectoral fin rays and on the posterior body surface, and the interopercular region may also bear short spines. Females remain relatively unadorned and develop a noticeably wider mid-body, most evident in dorsal view just behind the pectoral fins. The papilla provides a reliable secondary indicator in hand-sexed fish.
Habitat
The type locality — the Takutu River at the Brazil–Guyana border — connects to the Rio Branco, itself a major left-bank tributary of the Rio Negro (Amazon basin). The broader distribution recorded in the Catalog of Fishes (2026) spans the Takutu and Pirara rivers (Negro and Branco River drainages) across Brazil and Guyana; PlanetCatfish distribution data extends this to the middle Amazon (Solimões), the Negro, the lower and upper Branco (Roraima), and the Demini drainage.
These are primarily blackwater river systems originating on the Guiana Shield, characterised by very soft, humic-stained water with low conductivity, low pH (5.5–6.5 typical of shield blackwaters), and relatively low primary productivity. The Branco is somewhat more turbid where it crosses the Roraima savannas and may be slightly harder and less acidic than classic Negro blackwater, suggesting P. braueri tolerates a modest range of water chemistry.
Microhabitat is among submerged wood and rock substrates in areas of moderate current; the species has been collected alongside woody debris and in rock crevices in field surveys. Water temperatures across this region typically range from 72–82 °F between seasons.
Feeding
Peckoltia braueri is an omnivore with a broadly opportunistic diet, feeding on biofilm, algae, organic detritus, and invertebrate material. The genus Peckoltia occupies a dietary middle ground between the strict xylophages of the Panaque lineage and the predominantly carnivorous Hypancistrus — Peckoltia have medium-weight teeth of intermediate form and feed on the biofilm and organic matter found on and beneath submerged woody debris as well as on small invertebrates.
In the aquarium the species is unfussy. It accepts algae wafers, spirulina-based sinking foods, blanched vegetables (courgette/zucchini, cucumber, sweet potato), and meaty supplements such as frozen bloodworm and Daphnia. Driftwood is beneficial — the fish browses wood surfaces for biofilm and may ingest small quantities of degraded wood fibre — but P. braueri is not obligate wood-dependent in the way Panaqolus species are; omitting driftwood causes no acute dietary deficiency. A varied diet combining vegetable and protein components produces the best long-term condition.
Mating
Courtship in Peckoltia braueri has not been the subject of detailed published ethological study, but the pattern observed in captive specimens conforms to the standard Hypostominae loricariid model. Males claim and vigorously defend cave territories — PVC pipes, hollow driftwood logs, or narrow rock crevices — against both rival males and intruding females until a female is in full breeding condition, at which point the male shifts to active courtship, blocking the cave entrance and displaying to attract the female inside.
In community tanks that house multiple males, territorial interactions are largely expressed through posturing, lateral displays, and occasional head-butting; serious injury is rare if sufficient caves and visual barriers are provided. Males are easily recognised during the breeding season by the development of fine odontodes on the pectoral fin ray and posterior body surface; conditioned females become visibly wider-bodied with a swollen, rounded papilla. PlanetCatfish records 74 registered keepers and 27 spotting records, suggesting a well-established hobby presence, though no formal breeding report has been filed — consistent with the species being kept but seldom bred in full documentation.
Breeding
Like all Peckoltia, P. braueri is a cave spawner in which paternal brood care is the rule. After the female enters the male's cave and spawning occurs, she leaves or is expelled, and the male guards the adhesive egg mass deposited on the cave interior wall or ceiling. He fans the eggs continuously and removes unfertilised or fungused eggs; the clutch is sealed within the cave throughout incubation.
No published breeding report for this specific species has been lodged on PlanetCatfish as of 2026, making it difficult to give definitive figures for clutch size or incubation period. Based on closely related Peckoltia species of similar size, a reasonable expectation is a clutch of 20–50 eggs, incubation of approximately 5–7 days at 75–79 °F, and fry that are free-swimming and self-feeding within 2 weeks of hatching. Fry resemble miniature adults and should be offered the same mixed diet from the outset.
Successful captive breeding generally requires water chemistry close to the species' natural parameters: soft (below 10 °dH), pH 6.0–6.8, and temperature 75–81 °F. A partial water change with slightly cooler water after a brief period of lower temperature simulates the seasonal flood trigger that precedes breeding in the wild. Multiple cave options reduce male aggression and allow pairs to select compatible territories.
In the aquarium
Peckoltia braueri is among the most tractable medium-sized plecos for community aquaria. Its adult size of approximately 5 in SL (total length roughly 6.5 in) means it can be housed in tanks from 40 US gal upward, with 55 US gal providing comfortable breeding and territorial conditions. The species is described by PlanetCatfish as compatible with a very wide array of tankmates — 'perfectly safe with small fish and shrimp, or robust enough to withstand the attention of all but the largest cichlids' — and it is one of the few loricariids that is genuinely tolerant of both delicate nano fish and robust cichlid communities.
Decorations should include rockwork providing narrow caves or overhangs, and driftwood for grazing and shelter. Plants are not required but are safe if chosen from robust species (Anubias, Microsorum) anchored to hardscape rather than planted in substrate where grazing activity might disturb roots.
Water parameters should ideally reflect the blackwater origin: temperature 73–81 °F, pH 6.0–7.2, soft water. PlanetCatfish lists pH 6.5–7.2 and temperature 73–81 °F as the care range, suggesting some tolerance of neutral conditions. However, prolonged exposure to hard, alkaline water above pH 7.5 is inadvisable for long-term health.
The species has been in the trade for decades under its various L-numbers and is periodically available from specialist importers. Tank-raised specimens are preferable but rarely available; most imported fish are wild-caught from Guyana or Brazilian export operations. Good filtration, regular partial water changes (25–30% weekly), and varied feeding maintain the species in excellent long-term condition.
Conservation
Peckoltia braueri is assessed as Least Concern on the IUCN Red List, last evaluated in 2020, reflecting a distribution spanning the Takutu–Branco–Negro river system across Brazil and Guyana with no evidence of major population decline.
The species' range encompasses remote terrain in the upper Rio Negro and Roraima state, where deforestation and agricultural runoff affect water quality and submerged wood habitat. In the Brazilian state of Roraima, soybean expansion and cattle ranching in the Branco watershed have increased sedimentation in some tributaries — a concern for loricariids that depend on hard substrate and wood accumulations. Guyana maintains portions of the range within relatively pristine forest, providing refugia.
Collection for the ornamental trade from Guyana is regulated under export quota systems, but enforcement varies. The Worm-Line Peckoltia is a consistent component of Guyana ornamental exports and any significant intensification of collection would warrant re-evaluation of its status. Hobbyist captive breeding of this species, while not currently well-documented, would reduce trade pressure and should be encouraged.