Apistogramma iniridae

By Pet Zone SD Team • October 2026

Overview

Apistogramma iniridae is a Colombian dwarf cichlid from the Inírida River, a tributary of the Orinoco in Guainía department, and the first species on this site with a formal IUCN Red List assessment: Vulnerable, assessed in August 2020. Swedish ichthyologist Sven Kullander described the species in 1979 as part of a run of Orinoco-basin Apistogramma descriptions that reshaped the genus's taxonomy that decade — the same broad drainage that produced hoignei, already covered on this site, though the two occupy very different parts of the basin and look nothing alike. The name simply refers to the type locality on the Rio Inírida.

Its closest relative in the hobby is A. uaupesi, distinguished mainly by a lyre-shaped, forked-and-elongated tail versus iniridae's more evenly rounded one — a difference easy to miss without a clear photo, and a real source of mislabeling among sellers who don't specify which they're shipping. Iniridae itself stays genuinely uncommon: wholesale suppliers that carry it describe it as only occasionally available even to the trade, not something retail shops stock regularly.

Color & Identification

Coloration varies noticeably within a single population rather than splitting into distinct named forms — some individuals run heavily orange, concentrated mainly in the caudal fin, while others lean more uniformly blue. According to Aquarium Glaser, which handles wholesale stock of the species, both color types turn up side by side rather than representing separate collection points or subspecies. Males are the larger, more colorful sex and develop an enlarged, sail-like dorsal fin used in ritualized hierarchy contests with rival males — displays that look dramatic but are generally described as harmless posturing rather than real combat. Females stay plainer outside of brooding, in the usual Apistogramma pattern, and are reliably smaller.

Tank Setup

Size the tank for the male's sailfin displays and for a harem setup — one male with two or three females does better than a single pair, since it spreads out the female aggression described under Breeding below.

• Tank size: 20 gallons minimum, with a 24"+ long footprint preferred over a tall tank so a harem has room to establish separate territories.
• Substrate: Fine, dark substrate; leaf litter is a good fit given the species' soft, acidic native water.
• Hardscape & planting: Dense planting and driftwood with broken sightlines — caves and overlapping cover let subordinate females and the male retreat from a dominant female's aggression rather than being cornered.
• Filtration: Gentle flow; this species doesn't come from fast water and doesn't need strong current.
• Water changes: Regular partial changes with soft, acidic replacement water — avoid shocking the tank with harder tap water, which this species tolerates poorly compared to more adaptable apistos like cacatuoides.

Feeding

Iniridae isn't a fussy eater — Aquarium Glaser notes it readily accepts any type of frozen or live food. Build a diet around frozen bloodworm, daphnia, and brine shrimp, with live foods worked in to help condition a breeding group. See our general feeding guide for conditioning diets that apply across the genus.

Temperament & Compatibility

Iniridae is a harem breeder, not a pair-bonder — keep one male with multiple females rather than a single couple. Males settle disputes with other males through dorsal-fin displays rather than serious fighting, which is part of what makes the species engaging to watch. The bigger compatibility concern is female-on-female and female-on-male aggression once a female starts guarding a brood (see Breeding), so plenty of broken sightlines and separate territory matter more here than tankmate choice. As with the rest of the genus, don't mix iniridae with other Apistogramma species, and stick to calm dither fish that stay out of a guarding female's territory.

Breeding

Iniridae follows the standard Apistogramma cave-spawning pattern: a female lays 80 to 120 eggs on the ceiling of a cave and guards them alone, the typical harem-breeding setup for the genus. The real husbandry challenge isn't the spawn itself — it's what follows. Aquarium Glaser specifically flags that females can become very aggressive toward the male during brood care, more so than in many other apistos, which is the main reason a well-planted tank with multiple hiding places and sightline breaks matters so much for this species: the male needs somewhere to retreat to while a guarding female holds her territory. In a harem setup, expect only the dominant, spawning female to tolerate the male closely; give subordinate females their own territory well away from her cave. See our general breeding guide for why territory layout matters as much as water chemistry once fry are on the ground.

Sourcing Notes

Iniridae moves through wholesale and specialist importers rather than general retail, and even at that level suppliers describe it as only occasionally available — don't expect to find it on a standard shop stock list. That scarcity is compounded by its IUCN Vulnerable status (assessed 2020, tied to its restricted range in the Inírida basin and ongoing habitat decline there), which makes this one of the few apistos on this site where asking about a seller's source — wild-collected versus captive-bred — is a genuine conservation question and not just a husbandry one. Favor captive-bred stock when it's available, and see our general sourcing guide for vetting an uncommon species more broadly.

Final Thoughts

Iniridae is a reminder that this genus's challenges aren't always about pH and hardness — this is a moderate-chemistry species whose real difficulty is finding it at all, and once you have, deciding to source it responsibly given its documented Vulnerable status. Its dorsal-sailfin displays and side-by-side orange/blue color variation make it a rewarding fish to watch for keepers who can find a reliable supplier. If you already keep another Orinoco-basin apisto like hoignei and want something with more visual drama and a genuine rarity story, iniridae is worth specifically seeking out from a dedicated importer — just don't confuse it with its lyre-tailed cousin uaupesi at the point of sale.

Frequently Asked Questions

What's the difference between Apistogramma iniridae and Apistogramma uaupesi?

They're close relatives and easy to mix up in the trade. The clearest visible difference is the tail: uaupesi carries a lyre-shaped caudal fin — forked and elongated at the tips — while iniridae's tail stays more evenly rounded. Both come from the same general Orinoco/upper-Rio-Negro region of Colombia, which is part of why sellers occasionally mislabel one as the other. Ask for a clear photo of the tail shape if you want to be sure which one you're buying.

What water parameters does Apistogramma iniridae need?

Soft and acidic: pH 5.5–6.0 with a general hardness around 5 dGH or lower, at 78–86°F (26–30°C). FishBase records a somewhat wider wild temperature range (73–88°F / 23–31°C), but that spans the full range measured across its habitat, not necessarily what any one population or your tank should aim for — treat 78–86°F as the practical target.

How big does Apistogramma iniridae get?

Males reach roughly 3 inches (7–8cm) total length; females run about an inch smaller, around 2 inches (5cm) — the usual Apistogramma pattern of a larger, more colorful male. A FishBase reference based on preserved specimens gives smaller standard-length figures (3.6cm males, 5.0cm females), which is normal: standard length excludes the tail fin and often comes from a limited sample, so the total-length figures above are more useful for stocking decisions.

Is Apistogramma iniridae endangered?

It carries a formal IUCN Red List assessment of Vulnerable, assessed in August 2020 (criteria B1ab(iii,v), tied to its restricted range in the Inírida River basin and ongoing habitat decline there). That's a real, documented conservation status — not just "rare in the trade" — and it's the first species on this site with a formal IUCN listing. It's worth factoring in when you're deciding where to source your fish.

Where can you buy Apistogramma iniridae?

Rarely, and usually through specialist importers rather than general retail — wholesale suppliers that stock it describe it as only occasionally available even to the trade. Given its IUCN Vulnerable status, ask any seller whether their stock is wild-collected or captive-bred, and lean toward captive-bred fish when you have the choice. See our general sourcing guide for how to vet a seller on a species this uncommon.