Osteocarus Cory
Hoplisoma osteocarus
A graceful Orinoco miniature featuring a sandy beige coat uniformly dotted with striking black specks. It demands zero-edge fine sand to protect its short, sensitive foraging barbels.
Temperatura da água
22 - 26 °C
Valor de pH
6 - 7.2
Tipo de água
Água doce
Nível do tanque
Parte inferior
Tamanho adulto
4 cm
Volume mínimo do tanque
>= 80 L
Grupo mínimo
>= 6
GH
2 - 12 dGH
KH
2 - 10 dKH
TDS
50 - 280 ppm
Condutividade
78 - 438 uS/cm
Descrição da espécie
Geographical Origin and Habitat: Native to the Orinoco basins in Venezuela and the Guianas. It wanders in the tiny and ephemeral streams covered by the Amazon canopy, whose waters, mainly acidic, flow slowly over thick piles of debris and fallen vegetable echoes.
Taxonomy and Morphology: Belonging to the Callichthyidae family. Miniature Corydoras, whose dimensions barely reach 4 cm (1.6 inches). Classic round-snouted profile, very stocky and tall in its lateral projection.
Social Behavior: Proverbial shyness. Breeding singles or couples is deleterious and cruel. Requires compact swarms (10-15 specimens) to find the courage to actively sift the substrate. Frantic but measured and harmless movements.
Coloration and Sexual Dimorphism: Its name "osteocarus" ("bone head") derives from the strong evidence of the cranial bony plates. Pale gray-bronze background color finely dotted with black and brown; absence of large dark saddles. Females stand out over males due to the extremely swollen belly.
Cuidado, criação e companheiros de tanque
Aquarium Setup: No compromises on the substrate: very fine river sand necessary to avoid the amputation of the short barbels. Mandatory creation of interwoven wood canopies (Manila) and insertion of Catappa to yield precious humic acids.
Diet and Feeding: Being the mouthpart minute, the diet must be crushed or adapted. Offer very fine sinking and granular foods mixed bi-weekly with microworms, brine shrimp, and tiny bloodworms strictly thawed and washed.
Water Quality: Temperature 22-26°C (72-79°F). Very low hardness (GH 2-12). Neutral or weakly acidic pH (6.0 - 7.2) is essential. The fish does not tolerate spikes in pollutants (NO2/NH3) in the bottom, demanding oversized filtration for small aquariums.
Compatibility and Cohabitation: The ideal dwarf Corydoras. Irreplaceable for tanks of Tetras (Neons, Ember tetras), South American Rasboras, mignon Loricariids, and small peaceful cichlids. Aggressive cichlids, or fish with a strong burrowing instinct, would suppress it with stress.
Aquarium Breeding: Stimulated by simulating cold downpours. Witnessing the very tight T-position ritual rewards the observer with small but resistant clutches, anchored to the glass or on moss. Instinct of predation on their own eggs is very high: intervene immediately.
Risks and Diseases: Sharp calcareous bottoms lead to the rapid bacterial breakdown of the whiskers, followed by deadly starvation. Enormous vulnerability to Copper-based medicines or anti-mycosis shock treatments. Intolerance to saline changes.
Origem e distribuição geográfica
Native to the Orinoco basins in Venezuela and the Guianas. It wanders in the tiny and ephemeral streams covered by the Amazon canopy, whose waters, mainly acidic, flow slowly over thick piles of debris and fallen vegetable echoes.
Origem
Amazônia, Orinoco e Guianas
Perfil de peixe
- Temperamento
- Semi-aggressive
- These catfish are incredibly docile, peaceful, and non-aggressive, making Hoplisoma osteocarus perfect community tank residents. They are somewhat shy by nature and heavily rely on the presence of a school to feel secure and display their natural behaviors. Providing plenty of hiding spots such as caves, driftwood, and dense vegetation will make them feel more comfortable. They never bother other fish and often completely ignore species occupying the middle and upper levels of the tank.
- Dieta
- Omnivore
- Hoplisoma osteocarus is an omnivorous bottom feeder that constantly scavenges for food in the substrate. Their diet should be primarily composed of high-quality sinking pellets or wafers specifically formulated for bottom dwellers. To ensure optimal health and coloration, supplement their dry food with live or frozen foods such as bloodworms, daphnia, and brine shrimp. They will also eat uneaten food that falls from the surface, though they should not be treated merely as a clean-up crew.
- Expectativa de vida
- 5-8 years
- Tamanho adulto
- 4 cm
- Proporção sexual
- School
- While sexing them can be challenging, a ratio of two or three males per female is generally recommended for breeding Hoplisoma osteocarus. Females are noticeably rounder and broader, especially when viewed from above, and tend to grow slightly larger. Males appear more slender and streamlined in comparison. Keeping them in a mixed-sex school naturally accommodates these ratios without requiring precise selection by the aquarist.
- Frequência de alimentação
- Twice daily
- These active scavengers should be fed one to two times daily to ensure they receive adequate nutrition. It is important to offer Hoplisoma osteocarus only as much food as they can consume within a few minutes to prevent water quality issues. Since they are somewhat nocturnal by nature, feeding them once right before the aquarium lights turn off can be very beneficial. Monitoring their feeding is essential, especially in community tanks where faster mid-water fish might outcompete them for food.
- Carga biológica
- Low
- Hoplisoma osteocarus has a relatively small bioload compared to larger aquarium fish. Due to their compact size, they produce a manageable amount of waste that standard filtration can easily process. However, because they must be kept in groups of at least six, the cumulative bioload should be considered when stocking. Regular water changes and good mechanical filtration are still necessary to keep the substrate clean where they dwell.
- Fluxo
- Stagnant
- In the wild, Hoplisoma osteocarus typically inhabits slow to moderately flowing streams and tributaries. They appreciate some gentle water movement in the aquarium, which helps keep the water well-oxygenated. However, excessive current or strong powerheads should be avoided as it can exhaust them over time. A standard sponge filter or a hang-on-back filter with baffled flow usually provides the ideal water dynamics for this species.
- Risco de salto
- Yes
- The jump risk for Hoplisoma osteocarus is generally considered to be quite low. They are obligate bottom dwellers that spend the vast majority of their time sifting through the substrate. Occasionally, they will make quick darts to the surface to gulp atmospheric air, which is a completely normal behavior for this genus. Despite the low risk, it is still recommended to keep a well-fitting lid on the aquarium to prevent any accidental escapes during these upward dashes.
- Reprodução
- Oviparous
- Breeding Hoplisoma osteocarus in captivity is achievable but requires specific conditions to trigger spawning. A common trigger involves performing a large, slightly cooler water change to simulate the onset of the rainy season in their natural habitat. Females will lay adhesive eggs on broad-leaved plants, aquarium glass, or other flat surfaces. Once spawning is complete, the adult fish should be removed or the eggs transferred, as they may exhibit egg-eating behavior.
- Compatibilidade e companheiros de tanque
- Community
- This species is highly peaceful and makes an excellent addition to community aquariums. Hoplisoma osteocarus gets along perfectly with small tetras, rasboras, dwarf cichlids, and peaceful livebearers. It is crucial to avoid housing them with large, aggressive, or predatory fish that could bully them or attempt to eat them. As a schooling fish, they find safety and comfort in numbers of their own kind or similar Corydoras species.
- Nível do tanque
- Bottom
- As classic bottom dwellers, Hoplisoma osteocarus occupies the lowest levels of the aquarium. They spend their days tirelessly exploring the substrate in search of morsels of food using their sensitive barbels. It is absolutely essential to provide a soft, sandy substrate to prevent damage to their delicate sensory barbels. Although they mostly remain at the bottom, they will occasionally dart to the water surface to swallow a bubble of air for intestinal respiration.
Modelos e parâmetros científicos
FishBase
Acesso aos dados científicos oficiais da espécie
FishBase v25.04Dados sincronizados em: 15/06/2026
- Nível trófico
- 3 ± 0,4 se
- Resiliência
- Alta (menos de 15 meses)
- Unicidade filogenética (PD50)
- 0.5
- Relação bayesiana comprimento-peso
- a = 0.00741, b = 3.14
- VulnerabilidadeVulnerabilidade baixa (10 / 100)
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