Apistogramma gephyra

By Pet Zone SD Team • October 2026

Overview

Apistogramma gephyra's own name describes a scientific relationship that may no longer be true. Gephyra is Greek for "a bridge," and Sven Kullander chose it in his original 1980 description (Bonner Zoologische Monographien No. 14) because the species showed features intermediate between two other apistos covered on this site — agassizii and pertensis — placing it closer to pertensis specifically because its first dorsal and ventral spines lack dark pigment. Mike Wise, curator of the long-running aquarium reference site Cichlidae.com (Cichlid Room Companion), has since stated on the Apistogramma.com forum that this "bridge" relationship "no longer holds" under more recent taxonomic review. That leaves gephyra in an unusual spot: a formally described species whose own namesake logic has been publicly walked back by a leading reference, without a replacement name or a settled alternative placement to take its place.

Adding to the identification challenge, a breeder writing for the Potomac Valley Aquarium Society (PVAS) reports that juvenile gephyra — which show two spots along the lateral line — have been mistaken for female elizabethae, a third species already covered on this site. Between the agassizii/pertensis "bridge" dispute and the elizabethae juvenile mix-up, gephyra is tangled up with more already-covered species than almost anything else in this library — which makes it a genuinely interesting fish to read about even before you consider keeping one.

Color & Identification

Compiled from Mike Wise's comparative notes on the Apistogramma.com forum, several concrete traits separate gephyra from agassizii: it lacks breast scales (matching pertensis, unlike most of the agassizii complex), its dorsal, anal, and caudal fin tips run shorter and blunter, males always show red trim on the dorsal fin where only some agassizii males do, its white submarginal caudal band runs narrower, and its black lateral stripe runs from the eye straight through to just before the caudal spot — with a slight zigzag edge when the fish isn't displaying — rather than fading along the flank and reappearing on the tail the way agassizii's does. Fish from the middle and lower Rio Negro sometimes blend both sets of traits and resist confident identification either way. Aquarium Glaser, the German wholesaler that occasionally offers the species, markets it informally as a "Yellow Head Apistogramma" for the yellow coloration on the fish it has in stock — not an established trade name, just a descriptive label for one supplier's batch.

Tank Setup

Published aquarium-specific husbandry detail is thin for this species; the notes below lean on genus-standard practice plus the one detailed breeding account available (PVAS), rather than a deep well of species-specific reporting.

• Tank size: A 15–20 gallon long tank suits a pair, in line with other small-to-modest apistos such as trifasciata and pertensis rather than larger species like agassizii. The one documented breeding setup used a 10-gallon tank.
• Substrate & décor: Fine sand, driftwood, and leaf litter replicate the tea-colored Rio Negro and lower Rio Branco blackwater this species comes from. The PVAS breeding tank used broken clay-pot caves plus Vallisneria and Java moss.
• Filtration & flow: Gentle filtration is standard practice across the genus; see our tank setup guide for cycling and equipment basics before stocking.
• Water building: This is one of the softer-water species on this site even by genus standards — wild habitat runs close to pH 4 and roughly 1 dGH. See our water parameters guide for building and holding soft, acidic water reliably.

Feeding

In the one detailed account available, the breeding pair was fed heavily on live and frozen foods — tubifex, brine shrimp, and daphnia, with occasional baby brine shrimp for fry — and the fish reportedly ignored flake food outright. Treat that as one keeper's specific experience rather than a documented genus-wide rule, but it's consistent with how most Apistogramma respond best to live and frozen foods when conditioning for breeding; see our general feeding guide for portioning and conditioning diets that apply genus-wide.

Temperament & Compatibility

No dedicated temperament write-up exists for this species outside the one breeding account, where the fish behaved in line with typical genus patterns: calm outside of spawning, with the male turning aggressive toward the female after the pair spawned, and the female herself becoming more aggressive while guarding fry. As with every species on this site, avoid housing it with other Apistogramma species, including the ones it's most often confused with — agassizii, pertensis, and elizabethae — since even experienced keepers can struggle to tell overlapping individuals apart.

Breeding

Gephyra is a cave spawner with standard Apistogramma biparental care, not a mouthbrooder. In the PVAS account, the breeder shifted from weekly 25% water changes to biweekly 50% changes to mimic a rainy-season trigger, using peat-filtered water brought down from pH 8.5 to roughly pH 5 and under 2 dGH over three days, held at 80°F (26.7°C). Eggs were laid on the ceiling of a clay-pot cave and stayed pink while fertile; the first clutch was eaten by the parents, but a second clutch of around 30 eggs succeeded. The male grew aggressive after spawning and was removed from the tank — he died a few days later in isolation, an outcome the breeder didn't fully explain. The female alone reared the fry, turned a brighter yellow, and led the fry around the tank; the breeder sold her roughly two weeks after the fry became independent. Follow our general breeding guide for the broader conditioning-to-fry-rearing process, and treat this one documented spawn as a useful data point rather than a guaranteed outcome.

Sourcing Notes

Gephyra isn't a retail staple — Aquarium Glaser, one of the only wholesalers documented offering it, lists it as an occasional import rather than regular stock. Given the genuine, expert-acknowledged identification overlap with agassizii and the juvenile resemblance to elizabethae, ask any seller for the collection locality and, ideally, a clear adult photo before buying — don't assume a fish is gephyra on general appearance alone. See our general sourcing guide for more on verifying identification when a species is uncommon or disputed.

Final Thoughts

Gephyra is less a fish you seek out for its looks and more one you seek out for the puzzle attached to it — a species named for a taxonomic "bridge" that the field's own experts now say doesn't hold, tangled up in identification confusion with three other species on this site, and documented by exactly one detailed breeding account that ended in real losses along the way. If you want a forgiving, well-understood first apisto, start with cacatuoides or borellii instead. If you're the kind of keeper who finds that kind of unresolved taxonomic mess genuinely interesting, gephyra is one of the more quietly fascinating corners of this genus.

Frequently Asked Questions

What does the name "Apistogramma gephyra" mean?

Gephyra is Greek for "a bridge." Sven Kullander chose the name in his original 1980 description (Bonner Zoologische Monographien No. 14) because the species showed traits intermediate between two other apistos — Apistogramma agassizii and Apistogramma pertensis, both covered elsewhere on this site — and placed it closer to pertensis because of unpigmented spines on its first dorsal and ventral fins. Mike Wise, curator at the aquarium reference site Cichlidae.com (Cichlid Room Companion), has since stated that this "bridge" relationship "no longer holds" under more recent taxonomic review — so the species carries a name built on a connection its own namesake's logic has since been challenged.

How do you tell Apistogramma gephyra apart from A. agassizii?

Several concrete differences, compiled from curator Mike Wise's comparative notes on the Apistogramma.com forum: A. gephyra lacks breast scales, the same as A. pertensis and unlike most of the A. agassizii complex; its dorsal, anal, and caudal fin tips run shorter and blunter; males always carry red trim on the dorsal fin, where only some agassizii males do; its white submarginal caudal band runs narrower; and its black lateral stripe runs from the eye straight to just before the caudal spot, with a slight zigzag edge in resting fish, rather than fading along the flank and reappearing on the tail the way agassizii's does. Fish from the middle and lower Rio Negro sometimes show a mix of both sets of traits and can't be confidently assigned to either species on sight. A separate point of confusion: a breeder writing for the Potomac Valley Aquarium Society (PVAS) notes that juvenile gephyra, which show two spots along the lateral line, can be mistaken for female A. elizabethae — a third already-covered species this one gets confused with.

What water parameters does Apistogramma gephyra need?

Field reports describe its wild Rio Negro blackwater habitat as roughly pH 4 and about 1 dGH — tea-colored and extremely soft. For general aquarium keeping, the German reference Aqualog lists a broader pH 5.0–7.0 at 75–82°F (24–28°C). One hobbyist breeder (PVAS) needed much stricter water to spawn the species: peat-filtered tap water brought down from pH 8.5 to pH 5 and under 2 dGH over three days, held at 80°F (26.7°C). That breeder notes tank-raised stock may prove more flexible than their account suggests — treat the strict breeding figures as what worked for one wild-derived group, not a universal requirement.

How big does Apistogramma gephyra get?

Sources disagree. The wholesaler Aquarium Glaser lists offered specimens at 3–5cm (about 1.2–2in) and describes the species as notably smaller than A. agassizii. The German reference Aqualog's lexicon entry instead gives roughly 6cm for males and 4cm for females (about 2.4in / 1.6in) without explaining the larger figure. No FishBase length record could be verified for this species while researching this guide — several FishBase mirror pages were unreachable, and one that loaded returned data for a different species (A. baenschi) under what should have been gephyra's own ID, a mismatch we aren't using. Given the conflict between the two sources we could verify, treat gephyra as a small-to-modest apisto — noticeably smaller than agassizii — rather than relying on either single figure as exact.

Is Apistogramma gephyra common in the aquarium trade, and is it endangered?

No to both. Aquarium Glaser lists it as only an occasional wholesale import (stock code 619502), not a staple of the retail trade, which fits a species whose own identity is still debated among specialists. Cichlidae.com lists its IUCN Red List status as Least Concern, based on a 2009 assessment — a more secure rating than this site's iniridae (Vulnerable) or the Data Deficient figures reported for pantalone and cinilabra.