Mutabilis Tetra

Geographic Origin and Biotope: Originally discovered in the river systems of central-western Brazil (Mato Grosso, upper Tapajós River). Affinity for slow-water areas, thickly sheltered by submerged roots and flooded forest.

Taxonomy and Morphology: Mutabilis Tetra (Hyphessobrycon mutabilis). The name "mutabilis" alludes to the variability or ability to change color nuances. Compact oval shape, similar to other species of the Rosy Tetra clade.

Social Behavior: Relatively peaceful, although males engage in spectacular territorial displays. Very active and gregarious. Should be kept in schools of 8 or more to avoid drifting into shyness or bullying towards weaker tankmates.

Coloration and Sexual Dimorphism: Brownish-golden or pinkish background ("mutable" depending on light and mood), with a conspicuous humeral spot and colored fins with whitish edges. Females are pot-bellied and opaque, males slender and vivid.

Aquarium Setup: An 80 cm (32 inches) aquarium is appropriate. Substrate of fine or dark sand, many visual barriers formed by intricate roots and driftwood, in addition to some stem and floating plants.

Diet and Feeding: No particular requests. Excellent eater of flake food, but thrives and fully shows its mutable reflections if regularly fed with chopped Pacifica krill, brine shrimp, and bloodworms.

Water Quality: Well adaptable, prefers fresh and weakly acidic waters. Efficient filtration that generates a weak but diffuse current is recommended to keep the oxygen concentration very high.

Compatibility and Tankmates: Superb dither-fish in Amazonian community aquariums. Perfect with Dwarf Cichlids (Laetacara, Mikrogeophagus), various Loricariids, and Tetras of equal size.

Aquarium Reproduction: Spawning occurs by free scattering in the morning. The use of synthetic Mops or thick Java moss will ensure the rescue of the eggs. Parental care is non-existent.

Risks and Diseases: Solid fish. The main problem is stress if housed with large Cichlids (e.g. Astronotus or large Heros) which could perceive it as prey or stress it due to its size.