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No federal permit to keepRed Banded Leporinus
Synaptolaemus latofasciatus
Fishes › Tetras, piranhas and pacus (Characiformes) › Anostomidae (Headstanders)
Synaptolaemus is a monospecific genus of freshwater ray-finned fish belonging to the family Anostomidae, the toothed headstanders.
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 3.7 in / 9.4 cm).
- Water: Freshwater.
- Layout: An open-water swimmer: needs long, open swimming space with few obstacles.
- 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 47 × 18 in (roughly 64 US gallons); space needed is rated “large tank”.
- Water: a fairly wide range, from slightly acidic to slightly alkaline, 68–82 °F, pH 5–7.5, 2–12 dGH.
- Behaviour: 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:
- Diet: “Likely to be a foraging omnivore browsing algae, invertebrates and organic detritus from submerged solid surfaces in nature.”
From the Seriously Fish profile for this species, which has the full habitat, maintenance, diet, behaviour and breeding write-up 167
Headstanders
Applies to most species in this group. Habitat: South American headstanders occupy rivers and floodplain waters, with Anostomus grazing rocky fast-flowing margins and Leporinus fasciatus using channels, tributaries, lakes and flooded forest. Individual species can differ, so compare with the species numbers above and the linked sources.
Housing & setup
- For Anostomus anostomus, at least 120 × 30 cm (48 × 12 in) is the smallest footprint to consider; groups need larger housing.
- For Leporinus fasciatus, provide at least a 210 × 60 cm (84 × 24 in) footprint.
- Fit a secure lid: anostomids are strong jumpers.
- Use sand, smooth rocks and roots or branches; preserve swimming room and expect plants to be eaten.
- Provide mature biological filtration and good oxygenation; Anostomus benefit from water movement and lighting supporting algal grazing.
Climate & lighting
| Water | 68–82°F |
Diet
- For Anostomus, algae wafers and algae growing on solid surfaces.
- Blanched spinach or lettuce, cucumber or courgette.
- Small live or frozen aquatic invertebrates within an omnivorous diet; adjust the plant-to-animal balance to the identified species.
Social life
- A. anostomus can be quarrelsome in small groups: keep one or at least six in a substantially larger tank. Choose robust, suitably sized companions rather than assuming peaceful tetra-like behavior.
Health watch
- Injuries from jumping or territorial aggression.
- Ammonia-related illness in immature aquaria.
- Nutritional deficiencies from an inappropriate diet.
Understanding the animal
About this animal
About this animal
The only species in the genus is Synaptolaemus latofasciatus, a species found in South America.
Quoted from the Wikipedia article “Synaptolaemus” (CC BY-SA 4.0) 174
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. Distinct pairs breed on densely grown weedy places. |
| Water it lives in | Freshwater. |
| Climate | Tropical climate. |
| Behavior to plan for | Breeding: nesters. |
Native climate (measured)
Native climate (measured)
| Warm-season highs | about 93°F (up to 96°F in the hottest sampled areas) |
| Cool-season lows | about 70°F (down to 63°F in the coldest sampled areas) |
| Average temperature | 77–82°F across sampled records |
| Relative humidity | 76–82% on average (driest month about 68%) |
| Rainfall | about 2342 mm a year |
Measured at 24 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.
| Overview | Synaptolaemus is a monospecific genus of freshwater ray-finned fish belonging to the family Anostomidae, the toothed headstanders. The only species in the genus is Synaptolaemus latofasciatus, a species found in South America. — Wikipedia (community-edited) |
| 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 |
| Reproduction | Distinct pairs breed on densely grown weedy places. — FishBase |
| Appearance and size | Synaptolaemus is distinguished from other toothed headstanders by having teeth at the symphysis of the lower jaw which are roughly twice as long as they are wide and in the gill membranes having a broad union with the throat. The lower jaw has a width of half its length and is almost vertical when the mouth is closed. — Wikipedia (community-edited) |
| History and naming | Synaptolaemus was first proposed as a monospecific genus in 1950 by George S. Myers and Augustín Fernández-Yépez when they described Synaptolaemus cingulatus as a new species, designating it as the type species. The type locality of S. cingulatus was given as Laja Supira on the upper Orinoco River in Venezuela. — Wikipedia (community-edited) |
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; aim for the middle.
pH
Water hardness
Minimum tank footprint
Seriously Fish recommends a tank base of at least 47 × 18 in (about 64 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.
- Seriously Fish — anostomus Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Seriously Fish — leporinus fasciatus Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Merck Veterinary Manual — Disorders and Diseases of Fish Zoo, university or veterinaryAdded in the 2026 source-checked care-guide review.
- Wikipedia (species article) Community referenceFree encyclopedia; useful overviews with their own citations. Intro text is quoted under CC BY-SA 4.0.
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