Gosse's Corydoras
Corydoras gossei
A peaceful and hardy armored catfish from Brazil. Distinguished by its dark, finely speckled body and striking bright orange pectoral and dorsal fin spines.
Water Temperature
24 - 28 °C
pH Value
6 - 7.5
Water type
Freshwater
Tank level
Bottom
Adult size
6 cm
Minimum tank volume
>= 60 L
Minimum group
>= 6
GH
2 - 15 dGH
KH
1 - 7 dKH
TDS
40 - 295 ppm
Conductivity
63 - 461 uS/cm
Species description
Geographical Origin and Habitat: Native to South America, specifically inhabiting the Mamoré River basin in the state of Rondônia, Brazil. It populates forest streams, small tributaries, and flooded areas characterized by slow currents, clear to tea-colored waters tinted by organic tannins, and sandy riverbeds littered with decaying leaves and woody debris.
Taxonomy and Morphology: Belongs to the order Siluriformes, family Callichthyidae, and genus Corydoras. Described in 1972 by Nijssen and Isbrücker, it was named in honor of the Belgian ichthyologist Jean-Pierre Gosse. It features the characteristic armored body covered with two rows of overlapping bony plates (scutes) rather than scales. It reaches a maximum size of 5-6 cm (2-2.4 inches).
Social Behavior: Extremely peaceful and highly gregarious. It must be kept in groups of at least 6-8 individuals of its own species to feel secure and display its natural, active behaviors. They spend most of their time together, actively foraging along the substrate and swimming in synchronized groups.
Coloration and Sexual Dimorphism: Features a dark brownish-gray body, almost black on the dorsal surface, covered in fine light speckles. The most striking feature is the bright orange or golden-yellow coloration on the leading rays of the pectoral and dorsal fins. Adult females are noticeably larger, broader, and rounder than the slimmer males.
Care, breeding and tankmates
Aquarium Setup: Requires a tank with a minimum footprint of 80x30 cm (30x12 inches). It is absolutely vital to use a soft, fine sand substrate without sharp edges to prevent wear and bacterial infections of their delicate sensory barbels. Provide plenty of driftwood, smooth rocks, and dense plantings to create shaded areas and hiding spots.
Diet and Feeding: An omnivorous bottom-feeder. It should never be treated merely as a scavenger expected to live on leftovers. They require a dedicated diet of high-quality sinking pellets or wafers, supplemented regularly with live or frozen foods such as bloodworms, tubifex, brine shrimp, and daphnia.
Water Quality: Prefers soft, slightly acidic to neutral water. Ideal temperature range is 22-26°C (72-79°F), pH 6.0-7.2, and hardness GH 2-12. Maintaining low nitrate levels and excellent substrate hygiene via regular vacuuming is critical, as dirty sand can lead to barbel erosion and infections.
Compatibility and Cohabitation: Excellent candidate for peaceful community aquariums. It coexists perfectly with small characins (tetras), hatchetfish, peaceful dwarf cichlids, and other non-aggressive catfish such as Loricariids. Avoid large, aggressive, or predatory tankmates that could prey on or intimidate them.
Aquarium Breeding: Achievable and follows the typical Corydoras pattern. Breeding is stimulated by substantial water changes using slightly cooler water to simulate the onset of the rainy season. Eggs are deposited in small batches on plant leaves or aquarium glass. Parents must be removed post-spawning.
Risks and Diseases: Highly sensitive to ammonia and nitrite spikes, as well as accumulated organic waste on the substrate. Sharp gravel can cause physical damage to their barbels, leading to secondary bacterial infections. Use caution when dosing medications, as they do not tolerate copper-based treatments or salt well.
Geographic Origin and Distribution
Native to South America, specifically inhabiting the Mamoré River basin in the state of Rondônia, Brazil. It populates forest streams, small tributaries, and flooded areas characterized by slow currents, clear to tea-colored waters tinted by organic tannins, and sandy riverbeds littered with decaying leaves and woody debris.
Origin
Extra-Amazon South America
Fish profile
- Temperament
- Semi-aggressive
- The temperament of Corydoras gossei is incredibly peaceful, sociable, and somewhat shy when kept individually. They are an obligate schooling fish that absolutely requires the company of their own kind to feel secure and behave naturally. When kept in groups of at least six, they become active and highly entertaining as they constantly interact with one another. If kept alone or in inadequate numbers, they will likely become stressed, reclusive, and more susceptible to disease. They show zero aggression towards other tank inhabitants and are a model citizen for any peaceful community aquarium.
- Diet
- Omnivore
- In the wild, Corydoras gossei is a micro-predator and scavenger, feeding on tiny worms, crustaceans, and plant matter. In the home aquarium, they readily accept a wide variety of sinking foods such as high-quality pellets, wafers, and granules. It is essential to supplement their diet with live or frozen foods like bloodworms, Daphnia, and brine shrimp to ensure optimal health and coloration. Because they are bottom feeders, you must ensure that enough food reaches the substrate before being consumed by mid-water fish. A varied diet prevents nutritional deficiencies and promotes a robust immune system.
- Life expectancy
- 5 years
- It has an average lifespan of about 5 years in captivity, but under proper care and excellent water conditions, it can exceed 8 years. Keeping the substrate clean and performing regular filter maintenance are crucial to prevent bacterial infections. Sudden shifts in water parameters can severely compromise their health.
- Adult size
- 6 cm
- The catalog's scalar value is 6 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 5.5 cm for this species, recorded as standard length (SL). The taxonomic record consulted is Corydoras gossei (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Group
- For Corydoras gossei, maintaining a specific strict sex ratio is not strictly necessary for general community keeping, as they do not exhibit aggressive territorial behavior towards each other. However, if breeding is the primary goal, a ratio of two or three males for every single female is strongly recommended. This higher male-to-female ratio encourages competitive courtship and generally results in a higher fertilization rate for the eggs. In a standard display tank, simply ensuring they are in a suitably sized group of six or more individuals is more important than the exact gender makeup. Females are typically noticeably rounder and broader when viewed from above, especially when full of eggs.
- Feeding frequency
- Twice daily
- It is highly recommended to feed Corydoras gossei small portions one to two times a day. They have relatively small stomachs, so multiple small meals are much better than a single large one. Observe their feeding behavior carefully; all offered food should be consumed within roughly two to three minutes. If there is uneaten food left on the substrate, reduce the portion size during the next feeding. Foraging is a natural behavior, so spreading the food slightly can encourage natural scavenging activity.
- Bioload
- The bioload of Corydoras gossei is generally considered to be quite low compared to larger freshwater fish. They are small, efficient scavengers that do not produce excessive amounts of waste in the aquarium. However, because they must be kept in groups of at least six, the cumulative bioload should be factored into your filtration capacity. Regular water changes and good mechanical filtration are still necessary to maintain optimal water quality. Overfeeding can quickly spike ammonia, so moderation is key.
- Flow
- Stagnant
- As a species that often inhabits slow-moving to moderately flowing streams in South America, Corydoras gossei appreciates gentle to moderate water circulation. They do not fare well in highly turbulent environments where they must constantly struggle against strong currents. Providing areas of calmer water, especially near the bottom where they spend most of their time, is important for their rest. The filter return should provide adequate oxygenation without turning the tank into a whirlpool. Natural river stones and driftwood can be used to break the flow and create comfortable resting zones.
- Reproduction
- Oviparous
- Breeding Corydoras gossei in captivity is entirely possible but requires some dedicated preparation and conditioning. They are egg scatterers, typically laying their adhesive eggs on broad plant leaves, aquarium glass, or smooth stones after a lively courtship display. To trigger spawning, aquarists often perform a large, slightly cooler water change to simulate the onset of the rainy season in their natural habitat. Once eggs are laid, the parents may eat them, so it is often necessary to remove the eggs or the adult fish to a separate rearing tank. The fry are quite small and require infusoria or finely powdered foods before graduating to freshly hatched brine shrimp.
- Compatibility & tankmates
- Corydoras gossei is an extremely peaceful community fish that thrives in the company of other calm species. They should never be housed with large, aggressive, or highly active bottom-dwellers that might outcompete them for food or nip at their fins. Ideal tank mates include small tetras, rasboras, peaceful dwarf cichlids, and other similarly sized peaceful fish. Keeping them with small freshwater shrimp is usually safe, though tiny shrimplets might occasionally be eaten. Their peaceful nature makes them an excellent addition to almost any tranquil community setup.
- Tank level
- Bottom
- Like the vast majority of its relatives, Corydoras gossei is a dedicated bottom-dwelling fish that spends most of its time resting or foraging on the substrate. They use their sensitive barbels to constantly sift through sand or fine gravel in search of edible morsels. Providing a soft, sandy substrate is crucial to prevent their delicate barbels from wearing down or becoming infected. While they do occasionally dart to the water surface to gulp air, they will immediately return to the lower levels of the tank. Ensure there is plenty of open swimming space along the bottom alongside shaded resting areas under plants or driftwood.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 3 ± 0.4 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.00741, b = 3.14
- 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.
