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The Ammocryptocharax elegans, also known as the Chameleon Characin, is a small and discreet South American characin appreciated for its peaceful behavior and ability to blend into its surroundings. Native to Colombia, it belongs to the Crenuchidae family, a group often associated with small forest streams. Its understated coloration and small adult size make it appealing to aquarists who enjoy less commonly seen species. Since it is a wild-collected species, careful acclimation is especially important, particularly regarding feeding and water quality.

General description of the species

Ammocryptocharax elegans is a very small freshwater characin that is rather reserved and usually observed close to the bottom. It inhabits slow or moderately flowing areas where sand, fallen leaves, and roots provide cover. Its behavior relies heavily on discretion: it may remain motionless between short, quick movements, which explains the common name Chameleon Characin. In an aquarium, it does best in a small group, in a layout rich in shelters and with calm tank mates. This species remains uncommon in the specialty trade, without being considered among the rarest aquarium fish.

Geographic origin and biotope

The species is associated with Colombia, in the Magdalena drainage basin. It comes from small freshwater environments rather than broad open rivers. The typical habitat includes shallow areas, clear to slightly tinted water, a sandy or fine-gravel bottom, and cover provided by leaves, branches, and streamside vegetation. Some current may be present, but quiet margins and sheltered areas are important. In captivity, well-oxygenated, stable water free of waste is preferable to a strongly turbulent aquarium.

Precise location and local name

Its known range lies in Colombia, within the río Magdalena drainage. In the aquarium trade, the English name Chameleon Characin is the name most often encountered. Ammocryptocharax elegans does not have a widely established French vernacular name. To avoid confusion, using the complete scientific name is preferable, especially when purchasing wild specimens or fish sold under a general commercial name for small characins.

Appearance and physical characteristics

Ammocryptocharax elegans has a slender, elongated body suited to moving through small spaces among the substrate and vegetation. Its coloration is generally subdued, with silver, brownish, or translucent tones that may change with lighting, stress, and the aquarium layout. This ability to alter its visual contrast reinforces the camouflage impression associated with the name Chameleon Characin. Adult size remains small, at about 3 to 4 cm, and the fins are delicate. A dark substrate, plants, and shaded areas help display its natural tones more clearly.

General diet

In nature, Ammocryptocharax elegans likely feeds on very small prey and organisms picked from leaves, sand, and plant debris. In an aquarium, it accepts fine foods as long as they fit its small mouth. Offer small portions of frozen or live foods, such as baby brine shrimp, small daphnia, or finely crushed prepared foods. Several light feedings are better than one large feeding. Careful acclimation and moving prey often encourage feeding in wild-caught specimens.

Essential data

• Native river: río Magdalena drainage basin
• Local name used: Chameleon Characin in the aquarium trade
• Origin of the scientific name: Ammocryptocharax is a genus name formed from Greek roots associated with sand, secrecy, or camouflage, and a characin-like fish; elegans is Latin for elegant
• Full-name etymology: Ammocryptocharax suggests a characin concealed in sand; elegans means elegant
• Common/vernacular names: Chameleon Characin
• Family: Crenuchidae
• Subfamily: Crenuchinae
• Name pronunciation: am-oh-krip-toh-KAIR-aks - ELL-eh-ganz
• Discovery: Ernst Ahl, 1936
• Maximum adult size: about 4 cm
• Water temperature and pH: 23 to 27 °C; pH 6.0 to 7.2
• Stream appearance and surrounding vegetation: shallow streams, sandy or fine-gravel bottoms, fallen leaves, roots, and streamside vegetation
• Typical tank mates: peaceful small characins, noncompetitive small bottom fish, and invertebrates suited to soft water
• Temperament and behavior: peaceful, discreet, shy during acclimation, and often associated with the bottom
• Water depth: shallow areas
• Sexual dimorphism: slight and difficult to observe in juveniles
• Bottom structure and flow: sand, fine gravel, leaf litter, and low to moderate flow

In your aquarium

To succeed with Ammocryptocharax elegans, use a mature, well-filtered aquarium furnished with fine sand, plants, leaves, and shelters. Keep it in a group, avoid boisterous tank mates, and provide very small foods several times a day. Because this wild species may be sensitive to transport and sudden changes, slow acclimation and stable water are essential. Dim lighting can also encourage it to spend more time in view.