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River

Jamanxim

5 profiles across 5 families name the Jamanxim as a locality.

Species
5
Families
5
Photographed
5 of 5
Difficulty rated
5 of 5

Basin

Also in the Amazon basinspecies recorded from both

Shares fishes with rivers elsewherespecies recorded from both

Runs through

Subadult individuals.

Boulengerella maculata

Ctenoluciidae · Valenciennes, 1850

Max length
329mm SL13in SL
Tank
240 × 90cm96 × 36in
Temp
22–28°C72–82°F
pH
5.0–7.5

Both species also possesses a broader dark midlateral stripe on the body which tends to be more well-defined in B. lateristriga than in B. maculata. Colour pattern in B. maculata varies considerably with some specimens noticeably paler than others, for example, and the the broad midlateral stripe usually less intense in such individuals. This does not app...

Moderate
Specimen from the German aquarium trade.

Colomesus asellusAmazon Puffer

Tetraodontidae · Müller & Troschel, 1849

Max length
128mm SL5in SL
Tank
120 × 30cm48 × 12in
Temp
20–26°C68–79°F
pH
5.5–8.0

This species is also referred to as 'South American puffer', 'SAP', 'Amazonian puffer', 'Peruvian puffer', or 'Brazilian puffer' in the ornamental trade. Within the genus Colomesus, C. asellus can be immediately identified by possessing a unique transverse row of dermal flaps across the chin which is absent in its congeners C. psittacus and C. tocantinensis.

Moderate
Wild individual from the Danish aquarium trade; 'lemon' colour form.

Hyphessobrycon pulchripinnisLemon Tetra

Characidae · Ahl, 1937

Max length
40mm SL1.6in SL
Tank
80 × 30cm31 × 12in
Temp
20–28°C68–82°F
pH
5.0–7.5

This species is a popular aquarium fish and is bred on a commercial basis in several countries, with a selectively-bred albino form also available. Wild specimens are rarely collected due to the low price of the farmed fish, but the origin of the commercial strain is questionable. The species was considered endemic to the rio Tapajós basin, but in the early 1990s fish appearing identical to the aquarium form were photographed in the...

Easy
Nuptial adult pair; female at front.

Retroculus xinguensis

Cichlidae · Gosse, 1971

Max length
200mm SL8in SL
Tank
210 × 60cm84 × 24in
Temp
26–32°C79–90°F
pH
6.0–8.0

The precise extent of this species' range is unclear. The majority of records pertain to the lower rio Xingu basin in the state of Pará, northern Brazil, including middle and lower reaches of its major tributary the rio Iriri, although the type locality is in Mato Grosso state several hundred kilometres upstream. There also exist a handful of records from the rio Jamanxim (a major affluent of the rio Tapajós which drain...

Moderate
Individual collected from the rio Teles Pires drainage, rio Tapajós system, Brazil.

Synaptolaemus latofasciatus

Anostomidae · Steindachner, 1910

Max length
110mm SL4in SL
Tank
120 × 45cm48 × 18in
Temp
20–28°C68–82°F
pH
5.0–7.5

This species was described from a single specimen and included in the genus Leporinus until 2011 at which point the holotype was examined and recognised as corresponding to the fish described as Synaptolaemus cingulatus (Myers & Fernández-Yépez, 1950).

Moderate