Goldstripe headstander
Anostomus ternetzi
An elegant, streamlined fish adorned with three golden longitudinal bands on a dark background. Like all anostomids, it swims in a vertical head-down position, tirelessly exploring rocks and driftwood for food. A constant grazer, it alternates between browsing algae and periphyton and brief forays into the water column. Native to the Orinoco basin and Guyana, it requires long tanks with current and a tightly fitting lid — it is a formidable jumper.
Water Temperature
22 - 28 °C
pH Value
5.5 - 7.5
Water type
Freshwater
Tank level
Surface and middle
Adult size
14 cm
Minimum tank volume
>= 200 L
Minimum group
>= 5
GH
1 - 12 dGH
KH
1 - 6 dKH
TDS
25 - 240 ppm
Conductivity
39 - 375 uS/cm
Species description
Geographical Origin and Habitat: 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.
Care, breeding and tankmates
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 Cohabitation: 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 fin-tearer towards slow Tetras.
Aquarium Breeding: 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.
Geographic origin and distribution
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.
Origin
Amazon, Orinoco, and Guianas
Fish profile
- Temperament
- Territorial
- Anostomus ternetzi is generally peaceful but can exhibit territorial behavior, particularly towards conspecifics. To minimize squabbling and aggression, they should be kept in a group where a natural hierarchy can establish. They are active and sometimes boisterous, which may intimidate very shy or slow-moving tankmates.
- Diet
- Omnivore
- As omnivores with a strong herbivorous preference, their diet must include plenty of vegetable matter. They should be fed high-quality algae wafers, spirulina flakes, blanched vegetables like spinach or zucchini, and occasional live or frozen foods. Be aware that they are likely to graze on and damage soft-leaved live aquarium plants.
- Life expectancy
- 5-8 years
- Adult size
- 14 cm
- Sex ratio
- Group
- A strict sex ratio is difficult to define because males and females are not easily distinguished visually. However, they should be kept in a group of at least 5 to 8 individuals to distribute and reduce territorial aggression. Keeping them singly or in pairs often leads to heightened stress and aggression toward tankmates.
- Feeding frequency
- Continuous
- It is recommended to feed Anostomus ternetzi small portions two to three times a day. Providing multiple small feedings aligns with their natural behavior of grazing continuously throughout the day. Ensure that all food is consumed within a few minutes to prevent water contamination.
- Bioload
- Medium
- Anostomus ternetzi produces a moderate biological load due to its active lifestyle, size (up to 12 cm), and continuous grazing behavior. A robust filtration system, capable of turnover rates 4-5 times the tank volume per hour, is essential to keep water quality pristine. Regular partial water changes are required to control nitrate levels and maintain a clean environment.
- Flow
- Strong
- Originating from fast-flowing river habitats, Anostomus ternetzi prefers moderate to strong water flow. Good water movement and high oxygenation levels are crucial for replicating their natural environment and keeping them active. The use of powerheads or spray bars can help achieve the desired current in the aquarium.
- Jump risk
- Yes
- This species poses a high risk of jumping, especially when startled, stressed, or during acclimation. They are powerful, torpedo-shaped swimmers capable of leaping through very small openings. A tight-fitting lid or cover slides are mandatory to prevent accidental escapes.
- Reproduction
- Oviparous
- Breeding Anostomus ternetzi in the home aquarium is extremely difficult and remains largely unrecorded. They are egg-scatterers, but the specific environmental triggers required to stimulate spawning in captivity are not well understood. Successful reproduction has rarely, if ever, been documented in domestic aquaria.
- Compatibility & tankmates
- Peaceful
- They are suitable for community tanks with robust, peaceful tankmates of similar size, such as medium-sized tetras, loricaiids, and peaceful cichlids. They should not be housed with very small or slow, long-finned fish, as they may nip fins when stressed. Keeping them in a proper conspecific group is key to preventing them from bothering other species.
- Tank level
- Top/Middle
- Anostomus ternetzi is highly active and swims throughout the aquarium, though it primarily occupies the middle and upper levels. It is famous for its unique head-down swimming angle, which it uses while hovering or searching for food. They will frequently explore the bottom or graze on decorations, utilizing the entire water column.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
FishBase v25.04Data synced on: 06/15/2026
- Trophic level
- 2.6 ± 0.26 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.5312
- Bayesian Length-Weight
- a = 0.00891, b = 3.05
- VulnerabilityLow vulnerability (10 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
