Goldstripe headstander

Geographic Origin and Biotope: Central Amazon River, Orinoco basin and southern Brazilian rivers (e.g. Xingu). Prefers areas with thick riparian vegetation or submerged reed beds where the water flows constantly but without violent rapids.

Taxonomy and Morphology: Ternetz's Headstander (Anostomus ternetzi). An Anostomid with a thick "pencil" appearance. Also in this species, the superior mouth pushes the fish to maintain the distinctive crooked posture ("Headstander") to scrape food from surfaces.

Social Behavior: Very similar to its congener (A. anostomus), but known to be slightly less aggressive. Extremely gregarious, a large group (6-8 specimens) lives in a constant state of harmless skirmishes in which the "King" of the school is established.

Coloration and Sexual Dimorphism: Spectacular "zebra" livery: golden background broken by wide and evident thick VERTICAL black bands, unlike A. anostomus where they are horizontal. The fins fade slightly to red/orange. There is no apparent dimorphism.

Aquarium Setup: A swimming-oriented but structured aquarium (120 cm / 48 inches). Many tangled roots pointing upwards or sealed bamboo will help the fish to rest upside down feeling covered. Heavy cover mandatory to avoid fatal jumps.

Diet and Feeding: Predominantly herbivorous scraper, does not ignore protein invertebrates. Tender plants will be reduced to "skeletons" (Anubias resist). Must be supported with crushed peas, pure algae pellets and occasional bloodworms.

Water Quality: Pure Amazonian fish: the water should be soft and slightly acidic, but shows great adaptability if the changes are slow. Requires abundant oxygenation produced by a vigorous spray bar on the surface.

Compatibility and Tankmates: Perfect for the so-called "Placid Monster Aquariums". Pairs well with Panaque, large Metynnis (Silver Dollars), Geophagus and Leporinus. In small tanks or in small numbers it turns into a sadistic fin-tearer towards slow Tetras.

Aquarium Reproduction: Spawns in captivity are not well documented at the hobby level. It is assumed they spawn en masse at dawn, scattering tiny eggs in the thick foliage after complex chases.

Risks and Diseases: Since it feeds by "spitting and re-chewing" the mush from the bottom, the ingestion of sharp-edged gravel causes internal lacerations that are often lethal. Fine sand is mandatory.