Apistogramma allpahuayo

By Pet Zone SD Team • October 2026

Overview

Apistogramma allpahuayo is a Peruvian dwarf cichlid that the aquarium trade got wrong for seventeen years before science caught up. The species' own 2012 description, published by Uwe Romer and eleven co-authors in Vertebrate Zoology 62(2): 189-212, states that it had been imported for the hobby since at least 1995 under the name Apistogramma juruensis — a different species entirely. The describers found it is instead a close sibling species of A. cacatuoides, already covered on this site, sharing the same body shape, fin form, and three-stripe abdominal pattern. What sets it apart: a distinctive black, W-shaped marking across the lower jaw — the source of its old aquarium nickname "Black Chin" — a two-lobed tail fin in adult males, and a caudal-peduncle spot that stays visually separate from the body's lateral band, unlike the merged pattern in cacatuoides.

The holotype, an adult male measuring 37.2mm standard length, was collected on August 10, 2011, from a small lake and feeder brook in the Reserva Nacional Allpahuayo Mishana near Iquitos, Peru — the reserve the species is named for.

Natural Habitat

A biotope survey of the Rio Nanay basin streams within the Allpahuayo-Mishana reserve recorded classic Amazonian blackwater: pH 5.2-5.5, conductivity of just 40-50 microsiemens/cm (extremely soft, mineral-poor water), and temperatures of 26-30 degrees C, with some streams showing slight white-water influence. The streambeds are fine sand, with fallen branches, driftwood, and heavy leaf litter from the surrounding rainforest providing cover, alongside marginal vegetation including Eichhornia, Utricularia, and Salvinia. The same survey recorded allpahuayo sharing these waters with Laetacara, Crenicichla, Crenuchus spilurus, and several small characins and callichthyid catfish — a useful reference for a naturalistic South American blackwater community tank.

Tank Setup

• Tank size: Aqualog recommends at least 60cm (24") with 100cm (39") as a comfortable upper target. Follow this site's general dwarf cichlid guidance in the tank setup guide for stocking a single male with several females.
• Substrate & décor: Fine sand, consistent with its wild habitat, plus driftwood, dried leaf litter, and dense cover. This mirrors the setup already recommended for this site's other Peruvian blackwater species.
• Water chemistry: Aim for the acidic end of the aquarium-trade range — roughly pH 5.5-6.5 at 24-27 degrees C — rather than the widest tolerances Aqualog lists. See our water parameters guide for building soft, acidic water safely.
• Filtration & flow: No source gives species-specific filtration guidance. Gentle flow and stable, mature water are a safe default for any Amazonian blackwater apisto — see our water quality guide.

Feeding

Aquarium Glaser notes that in the wild, much of this species' nutrition comes from decaying plant matter and the microorganisms living in it, and cautions against overfeeding fatty foods or excessive bloodworm in the aquarium, since its digestive system is adapted to high-fiber food rather than rich protein. Aqualog separately confirms it readily accepts frozen food, live food, and dry flake in captivity. Favor a varied, fiber-inclusive diet over a bloodworm-heavy one; see our general feeding guide for broader strategy.

Temperament & Compatibility

Aqualog describes the species as sociable and suited to being kept in pairs, with activity during the day. No source provides a detailed aggression rating comparable to this site's better-documented species. The more important compatibility note is taxonomic rather than behavioral: because allpahuayo is a true sibling species of A. cacatuoides, the two should never be kept together or bred in proximity — see the FAQ below for why the hybridization risk here is unusually high.

Breeding

No source consulted for this guide gives species-specific spawning details for A. allpahuayo — a reasonable gap, given the species has only been correctly identified in the hobby since its 2012 description. Like every other species on this site, treat it as a cave spawner: provide a small cave or upturned pot, condition a pair on quality food, and expect the female to take the lead in defending eggs and fry once she accepts a male. Follow our general breeding guide for the conditioning-to-fry process, and never breed it near A. cacatuoides or any other Apistogramma.

Sourcing Notes

Because this species was sold under the wrong name (A. juruensis, or the aquarium nickname "Black Chin") for most of its import history, older stock and even some current listings may still be mislabeled. If you're buying specifically for A. allpahuayo, look for the distinguishing black W-shaped chin marking and the separated caudal-peduncle spot described above, and ask the seller whether their stock has been confirmed against the 2012 description rather than sold on by trade name alone. See our general sourcing guide for broader guidance on verifying identification.

Final Thoughts

Allpahuayo is a reminder that even a widely kept genus like Apistogramma still has misidentified fish swimming around hobby tanks under the wrong label. If you already keep and love cacatuoides, allpahuayo is the closest thing on this site to "the same species, correctly identified as a different one" — just never keep the two together. If you want an established, easier-to-source species to start with instead, try cacatuoides or borellii.

Frequently Asked Questions

What makes Apistogramma allpahuayo noteworthy beyond its own care requirements?

It spent nearly two decades in the hobby under the wrong identity. The original species description, published by Romer, Beninde, Duponchelle and ten co-authors in Vertebrate Zoology 62(2): 189-212 (2012), states plainly that the fish had been imported for the aquarium trade since at least 1995 misidentified as Apistogramma juruensis. The describers found it is actually a sibling species of this site's own A. cacatuoides — sharing the same body shape, fin form, and a comparable three-stripe abdominal pattern — but separable by a distinctive black, W-shaped marking across the lower jaw (the source of its old aquarium nickname, "Black Chin"), a two-lobed (lyrate) tail fin in adult males, and a round caudal-peduncle spot that stays clearly separated from the body's lateral band, unlike in A. cacatuoides where the two merge. The holotype, a male 37.2mm standard length, was collected August 10, 2011, in the Reserva Nacional Allpahuayo Mishana near Iquitos, Peru — the reserve that gives the species its name.

How big does Apistogramma allpahuayo get?

Sources disagree significantly, and the type of measurement explains much of the gap. FishBase's formal figures, drawn from the scientific description, cap it at 4.0cm (1.6in) standard length for males and 3.1cm (1.2in) for females — consistent with the 37.2mm holotype. Aquarium-trade sources report noticeably larger total lengths: Aquarium Glaser gives roughly 7cm (2.8in) for males and 4cm (1.6in) for females, while Aqualog gives roughly 8cm (3.1in) for males and 5cm (2in) for females. Standard length excludes the tail fin and total length includes it, which accounts for some of the difference, but not all of it — treat the aquarium-trade figures as the more realistic planning numbers for an adult male's actual tank footprint, and the FishBase figure as the conservative scientific minimum.

What water parameters does Apistogramma allpahuayo need?

Wild and aquarium-trade sources both agree this is a soft, acidic blackwater species, though their exact numbers differ. A biotope survey of the Rio Nanay streams in the Allpahuayo-Mishana reserve recorded pH 5.2-5.5, conductivity of only 40-50 microsiemens/cm (extremely soft, mineral-poor water), and temperatures of 26-30 degrees C. Aqualog's aquarium-care figures give a noticeably broader pH range of 5.0-7.0 at a cooler 22-26 degrees C, while Aquarium Glaser's notes describe the same fish as needing soft, acidic, low-germ water at 24-28 degrees C. For a tank, aim toward the acidic end of these ranges — pH 5.5-6.5 at 24-27 degrees C — rather than the widest tolerances some sources allow. See our water parameters guide for building soft, acidic water safely.

Is Apistogramma allpahuayo endangered?

No. It carries an IUCN Red List rating of Least Concern. That's a notably better conservation standing than several of this site's other Peruvian and Rio Negro specialists that remain Data Deficient or formally unevaluated, such as brevis and paulmuelleri, though its single confirmed type locality near Iquitos means local habitat disturbance is still worth watching.

Can Apistogramma allpahuayo be kept with or bred near Apistogramma cacatuoides?

Don't risk it. The 2012 description identifies allpahuayo as a true sibling species of cacatuoides within the same lineage and complex, which is exactly the kind of close relationship that produces viable, identity-muddying hybrids in Apistogramma. This site's standing rule against housing two Apistogramma species together applies with extra force here — keep allpahuayo away from cacatuoides and from any other closely related apisto, not just to prevent generic cross-breeding but because the two are similar enough that accidental hybrid offspring could be mistaken for either parent species and re-enter the hobby mislabeled, repeating the exact confusion that took 17 years to untangle the first time.