Home / Fishes / Cichlids / Cichlidae / Geophagus parnaibae
No federal permit to keepGeophagus parnaibae
Geophagus parnaibae
Fishes › Cichlids (Cichliformes) › Cichlidae (Cichlids)
Care follows the oscars, peacock bass, pike cichlids and eartheaters guide below.
Care at a glance
Species-specific aquarium care
- Tank: At least 24 in long and 12 in front to back for one adult (adults commonly reach about 3.0 in / 7.59 cm).
- Water: Freshwater.
- Temperature: 75–88°F (range recorded for this species).
- pH: 6.5–7.6.
- Layout: Uses both the bottom and open water: give open swimming space plus cover near the substrate.
- Availability: Rarely or never seen in the aquarium trade; expect to source it from specialists or not at all.
Calculated from this species' own FishBase record: tank size from its typical adult length and swimming zone, water values from its recorded ranges. The group guide below fills in general care.
Care guide
Species care notes
- Tank: a base of at least 39 × 18 in (roughly 54 US gallons); space needed is rated “large tank”.
- Water: a fairly wide range, from slightly acidic to slightly alkaline, 75–88 °F, pH 6.5–7.6, 2–10 dGH.
- Behaviour: temperament peaceful; a shoaling fish best kept in a group of six or more; not a community fish.
- Difficulty: Moderate (Seriously Fish rating).
Short excerpts from the species profile:
- Setup: “The most essential item of décor is a soft, sandy substrate so that the fish can browse naturally (see 'Diet').”
- Tankmates: “Unless breeding this species is surprisingly peaceful and will not predate on fishes larger than a few millimetres in length.”
- Breeding: “Substrate-spawning, ovophilous, biparental mouthbrooder that has been bred on numerous occasions in aquaria.”
From the Seriously Fish profile for this species, which has the full habitat, maintenance, diet, behaviour and breeding write-up 167
Oscars, peacock bass, pike cichlids and eartheaters
Applies to most species in this group. Habitat: Large South American rivers. Individual species can differ, so compare with the species numbers above and the linked sources.
Housing & setup
- For one adult Astronotus ocellatus, plan at least a 150 × 60 cm base according to Seriously Fish; pairs and groups need more space. Use separate adult plans for Cichla and each eartheater species.
- Soft sand for eartheaters (Geophagus, Satanoperca), which sift substrate through their gills.
Climate & lighting
Starting point only: The blanket warm-water interval excludes the subtropical seasonal requirements of G. balzanii; use overrides. Check the species-specific values for this animal where shown.
| Water | 77–84°F |
Diet
- Astronotus ocellatus is an omnivore with a preference for animal foods; offer quality pellets and varied suitable foods rather than feeder-fish dependence. Cichla and substrate-sifting eartheaters require separate feeding plans.
Health watch
- Hole-in-the-head disease and lateral line erosion in poor water; eartheaters suffer on sharp gravel.
Understanding the animal
In the wild
In the wild
From this species’ own FishBase record (habitat, bottom type, water and breeding data), not its family. Good care copies these conditions.1
| Where it lives | Lives in freshwater. Uses both the bottom and open water. Inhabits bare sandy bottoms in brooks and small rivers with remarkably strong current during the rainy season. Also occurs frequently in pools and ponds with more or less stagnant water during the dry season and the period of low water. |
| Water it lives in | Freshwater, 75–88 °F (24–31 °C), pH 6.5–7.6. |
| Climate | Tropical climate. |
What this means for care
- Keep water within its wild range, 75–88 °F.
Native climate (measured)
Native climate (measured)
| Warm-season highs | about 94°F (up to 96°F in the hottest sampled areas) |
| Cool-season lows | about 67°F (down to 62°F in the coldest sampled areas) |
| Average temperature | 78–81°F across sampled records |
| Relative humidity | 67–71% on average (driest month about 55%) |
| Rainfall | about 1342 mm a year, with strong wet and dry seasons |
Measured at 35 wild occurrence records sampled against WorldClim 2.1 climate data (1970–2000 averages). Air conditions in the range are ecological context, not enclosure settings: microhabitats such as burrows, leaf litter or basking rocks can be cooler, warmer or more humid.
From the sources
From the sources
Quoted from the matching sections of reputable sources for this exact species. Specialist databases are used first; Wikipedia (community-edited, CC BY-SA 4.0) only fills gaps. Other sources are short credited quotes.
| Where it lives | Home ranges Population dynamics Growth parameters Max. ages / sizes Length-weight rel. Length-frequencies Mass conversion Recruitment Abundance Life cycle Reproduction Maturity Maturity/Gills rel. — FishBase |
| Biology | Inhabits bare sandy bottoms in brooks and small rivers with remarkably strong current during the rainy season. Also occurs frequently in pools and ponds with more or less stagnant water during the dry season and the period of low water. A specimen measuring 6.5 cm SL has 80% plant matter (mainly seeds), aquatic insect larvae, detritus and sand grains in its stomach and adjacent intestine. — FishBase |
Data and studies
The numbers
The numbers
Each bar is what one source reports. Where several sources weigh in, the dashed gold band marks their average.
Adult length
Maximum recorded length. Measured as standard length (snout to the base of the tail, not counting the tail fin). Fish in home aquariums often stay smaller than wild records.
Water temperature
Range the species tolerates in nature; aim for the middle.
Water hardness
Minimum tank footprint
Seriously Fish recommends a tank base of at least 39 × 18 in (about 54 US gallons).
Sources for this sheet
- FishBase (Froese & Pauly, eds.), version 24.07 Peer-reviewed researchThe global scientific database on fishes, maintained by a consortium of research institutions; every value is referenced.
- Seriously Fish species profiles Experienced keeper or breederLong-running aquarium reference written and peer-checked by experienced fishkeepers and ichthyologists; each profile covers habitat, tank size, water, diet, behaviour and breeding.
- Merck Veterinary Manual: Management of aquarium fish Zoo, university or veterinaryThe Merck Veterinary Manual: a standard veterinary reference written and reviewed by veterinary specialists.
- Merck Veterinary Manual: Types and features of aquatic systems Zoo, university or veterinaryThe Merck Veterinary Manual: a standard veterinary reference written and reviewed by veterinary specialists.
- Seriously Fish: Gymnogeophagus balzanii Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Seriously Fish — Astronotus ocellatus Zoo, university or veterinaryAdded in the 2026 source-checked care-guide review.
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