C005 Corydoras Pantanalensis

Quick Summary

Brochis pantanalensis is a robust, taller-bodied catfish closely related to the more familiar Corydoras species, well-suited to community aquariums with soft substrates and peaceful tank mates. It is a moderately easy species to keep provided you house it in groups of six or more and maintain clean, well-oxygenated water – a solid choice for aquarists who have some experience with corydoradine catfish.

🐠 Build a tank around this species

In this guide:

• Introduction
• Quick Stats
• Appearance
• Natural Habitat
• Tank Size and Setup
• Water Parameters
• Diet and Feeding
• Behaviour and Temperament

Introduction

The C005 Corydoras Pantanalensis, scientifically described as Brochis pantanalensis, is a distinctive member of the Brochis genus that hails from the vast Pantanal wetlands spanning parts of Brazil, Bolivia, and Paraguay. For many years this fish circulated in the hobby under the Corydoras World trade code C005, and it was only relatively recently that it received a formal scientific description. The 2024 taxonomic revision confirmed its placement within the genus Brochis, separating these taller-bodied, more heavily built catfish from the typical Corydoras form.

In the aquarium trade, Brochis pantanalensis occupies a fascinating middle ground. It shares the endearing bottom-dwelling behaviour and social nature of the classic Corydoras species, but its deeper body profile and slightly larger adult size give it a more imposing presence in the tank. It is not as commonly available as species such as Brochis splendens (the emerald catfish) or Corydoras aeneus, which makes it something of a collector’s fish. Nevertheless, its care requirements are broadly in line with standard corydoradine husbandry, making it accessible to any aquarist willing to provide the correct environment.

Like all corydoradine catfish, Brochis pantanalensis is an obligate social species that should never be kept alone. A group of six is the absolute minimum, and larger groups of eight to twelve will produce far more natural behaviour. These fish communicate through subtle body language, forage together across the substrate, and rest in close physical contact with one another. A solitary individual will be stressed, reclusive, and prone to illness.

This guide covers everything you need to know to keep Brochis pantanalensis healthy and thriving, from tank setup and water chemistry to diet, breeding, and compatible tank mates.

Appearance

Brochis pantanalensis is immediately recognisable by its deeper, more compressed body compared to the flatter profile of most Corydoras species. The genus Brochis is characterised by this taller body shape, a more extensive dorsal fin with a greater number of rays, and a generally more robust build. In B. pantanalensis specifically, the body is moderately elongated with a pronounced upward arch along the back, giving the fish a somewhat chunky or stocky silhouette when viewed from the side.

The base colouration is typically an olive-green to bronze-green across the flanks and dorsal surface, with a paler, cream-to-white ventral area. Under good lighting conditions, a subtle metallic sheen is visible across the upper body, though it is generally less vivid than the bright emerald lustre seen in Brochis splendens. The flanks may display faint darker mottling or a series of indistinct spots along the lateral scute rows, though this patterning varies between individuals and can become more or less prominent depending on the fish’s mood and environment.

The head is broad and blunt, with a slightly downturned mouth flanked by the typical three pairs of barbels found in corydoradine catfish. These barbels are essential sensory organs used for detecting food in the substrate, and their condition is a reliable indicator of overall health – eroded or shortened barbels usually point to poor substrate choice or water quality issues. The eyes are relatively large and positioned high on the head, giving the fish excellent peripheral vision.

The dorsal fin is notably tall and contains more soft rays than is typical in Corydoras, which is one of the key diagnostic features separating Brochis from Corydoras. The pectoral fins are well-developed and carry a stiff leading spine that the fish can lock into position as a defensive mechanism. The caudal fin is forked and translucent with a slight dusky tinge. Sexual dimorphism is subtle: mature females tend to be slightly broader and deeper-bodied than males, particularly when viewed from above, and they may appear noticeably rounder when carrying eggs.

Juvenile fish are generally paler and may show more distinct spotting or banding that fades as they mature. Healthy adults in well-maintained aquariums develop their best colouration, with the metallic sheen becoming more pronounced and the overall body tone deepening to a rich olive-bronze.

Natural Habitat

Brochis pantanalensis is endemic to the Pantanal, the world’s largest tropical wetland, which stretches across western Brazil, eastern Bolivia, and northern Paraguay. This immense floodplain is fed primarily by the Paraguay River and its tributaries and is characterised by dramatic seasonal flooding. During the wet season, from roughly October to March, vast areas of grassland, scrubland, and forest become inundated, creating an enormous interconnected aquatic habitat. During the dry season, the waters recede, concentrating fish populations into permanent rivers, lakes, and pools.

In this environment, Brochis pantanalensis inhabits slow-moving or still waters with soft, muddy substrates rich in organic detritus. The fish is typically found in shallow, marginal areas where submerged vegetation, leaf litter, and fallen branches provide cover and foraging opportunities. The substrate in these habitats is predominantly fine silt and sand overlaid with decomposing plant matter, which the fish sifts through methodically using its sensitive barbels.

Water conditions in the Pantanal vary considerably with the seasons but are generally warm, slightly acidic to neutral, and soft to moderately hard. During peak flooding, the water is often stained a light tea colour by tannins released from decomposing vegetation, which reduces light levels and provides a degree of UV protection. Dissolved oxygen levels can fluctuate, particularly in shallow pools during the dry season, and like all corydoradine catfish, Brochis pantanalensis possesses the ability to gulp air at the surface and absorb oxygen through its modified intestinal lining – a vital adaptation for surviving in oxygen-poor conditions.

The Pantanal supports extraordinary biodiversity, and Brochis pantanalensis shares its habitat with a wide range of other fish species including various characins, cichlids, loricariid catfish, and other callichthyids. Understanding this natural context is valuable for replicating appropriate conditions in captivity and selecting suitable tank mates.

Tank Size and Setup

A group of six Brochis pantanalensis requires a minimum tank size of 120 litres, though larger is always preferable, particularly if you intend to keep a bigger group or house them alongside other species. Given their adult size of 7-8 cm and their active bottom-dwelling nature, floor space is more important than water depth. A tank with dimensions of at least 80 cm in length and 30 cm front-to-back provides adequate foraging area for a small group. For groups of eight or more, or for community setups, consider 180 litres or above.

Substrate choice is critical for Brochis pantanalensis. These fish spend the vast majority of their time in direct contact with the substrate, sifting through it with their delicate barbels. Coarse gravel, sharp-edged substrates, or anything that could abrade their barbels must be avoided. Fine, smooth sand is the ideal choice – either silver sand, play sand (thoroughly rinsed), or purpose-made aquarium sand. Some aquarists use very fine, rounded gravel successfully, but sand most closely replicates the natural habitat and allows the fish to exhibit their full repertoire of foraging behaviours, including plunging their snouts into the substrate and expelling sand through their gills.

Decor should provide a mixture of open foraging areas and sheltered resting spots. Driftwood, smooth river stones, and dense plantings around the tank’s perimeter work well together. Leave the central and front areas of the tank relatively open to give the group room to roam. Brochis pantanalensis appreciates shaded areas and will often rest beneath overhanging wood or broad-leaved plants during the middle of the day. Floating plants such as Amazon frogbit or water lettuce can be used to diffuse overhead lighting and create a more naturalistic, dimmer environment.

A thin scattering of dried leaf litter – Indian almond leaves, oak leaves, or beech leaves – over part of the substrate adds a lovely natural touch and releases beneficial tannins into the water. The leaves also harbour biofilm and microfauna that the fish will graze on between meals. Replace the leaves as they decompose, roughly every few weeks.

Brochis pantanalensis is a capable air-gulper and will periodically dash to the surface to take a breath. Ensure there is always a gap between the water surface and any cover glass or hood to allow easy access to atmospheric air. A tank that is filled right to the brim with no airspace above can stress these fish.

Water Parameters

Brochis pantanalensis is reasonably adaptable in terms of water chemistry, but it thrives best in slightly soft, slightly acidic to neutral water that mirrors its Pantanal origins. A pH between 6.5 and 7.2 and a GH of 4-10 dGH represents the sweet spot for long-term health. That said, the species will tolerate moderately hard, slightly alkaline water provided other conditions are good – stability matters more than hitting a precise number.

Temperature should be maintained between 22 and 26 degrees Celsius. The lower end of this range is often preferable, as cooler water holds more dissolved oxygen, and corydoradine catfish generally do better at moderate temperatures rather than tropical extremes. Avoid sustained temperatures above 27 C, which can cause stress and reduce the fish’s lifespan over time.

Water quality is non-negotiable. Ammonia and nitrite must be at zero at all times – these compounds are toxic to all fish but corydoradine catfish, with their sensitive barbels and bottom-dwelling habits, are particularly vulnerable. Nitrate should be kept below 20 ppm through regular water changes. A weekly water change of 25-30% is a good baseline, adjusted as needed based on stocking density and feeding regime. Use a quality dechlorinator and match the temperature and approximate chemistry of the replacement water to avoid shocking the fish.

Adding tannins to the water through driftwood, Indian almond leaves, or alder cones is beneficial. The mild acidification and antimicrobial properties of tannins can help prevent infections and create a more comfortable environment. This will tint the water a light amber colour, which also helps replicate the natural conditions of the Pantanal floodplains.

Filtration and Equipment

Good filtration is essential for keeping Brochis pantanalensis healthy. As bottom-dwellers, these fish are in constant contact with the substrate where detritus, uneaten food, and waste products tend to accumulate. A filter that provides efficient mechanical and biological filtration while generating a gentle to moderate flow is ideal. External canister filters are an excellent choice for tanks of 120 litres and above, as they offer large media capacity and adjustable flow rates. Internal power filters and hang-on-back filters can also work well in appropriately sized tanks.

Avoid creating excessively strong currents along the bottom of the tank. While Brochis pantanalensis can tolerate moderate flow, it naturally inhabits slow-moving or still waters and will be stressed by a powerful current that constantly pushes it around. Position the filter outlet to create gentle circulation across the tank’s surface, ensuring good gas exchange and oxygenation without creating a strong directional current along the substrate. A spray bar or lily pipe can help diffuse the flow.

An air stone or sponge filter run off an air pump provides supplementary oxygenation and is particularly useful during warmer months when dissolved oxygen levels drop. Brochis pantanalensis can supplement its oxygen intake by gulping air at the surface, but relying on this behaviour as a primary oxygen source indicates that the water is insufficiently oxygenated – address the root cause rather than expecting the fish to compensate.

Lighting should be moderate. These fish are not particularly light-sensitive, but they are naturally more active during dawn and dusk and tend to rest in shaded spots during bright midday conditions. Standard LED aquarium lighting with a photoperiod of 8-10 hours per day is fine. If the tank lacks floating plants or overhanging decor, consider dimming the lights slightly or using a ramp-up/ramp-down timer to simulate natural light transitions.

A heater with a reliable thermostat is necessary unless you live in a climate where room temperature consistently stays within the 22-26 C range. Choose a heater rated appropriately for your tank volume and consider using a heater guard to prevent the fish from resting against it and sustaining burns – an underappreciated risk with bottom-dwelling species.

Diet and Feeding

Brochis pantanalensis is an omnivore with a strong preference for protein-rich foods, though it readily accepts a varied diet in captivity. In the wild, its diet consists primarily of insect larvae, small crustaceans, worms, and organic detritus sifted from the substrate. Replicating this variety in the aquarium is straightforward and will keep the fish in excellent condition.

A high-quality sinking pellet or wafer designed for bottom-feeding catfish should form the staple of the diet. Look for products with whole fish meal, shrimp meal, or insect meal as the primary ingredients rather than those padded with cereal fillers. Sinking tablets and wafers are preferable to flake food, which tends to be consumed by mid-water fish before it reaches the bottom.

Supplement the staple diet with regular offerings of frozen or live foods. Bloodworm, daphnia, brine shrimp, tubifex, and white mosquito larvae are all eagerly accepted. Live foods are particularly valuable for conditioning fish for breeding and for encouraging natural foraging behaviour. If you feed frozen foods, thaw them in a small amount of tank water before adding them to the aquarium to avoid introducing a sudden temperature change.

Blanched vegetables such as courgette (zucchini), cucumber, spinach, and shelled peas can be offered occasionally. While Brochis pantanalensis is not primarily herbivorous, it will nibble on softened vegetables, and these foods provide useful fibre and micronutrients. Remove any uneaten vegetable matter after 12-24 hours to prevent it from fouling the water.

Feed once or twice daily, offering only as much food as the group can consume within a few minutes. Overfeeding is a common mistake with bottom-dwelling catfish – leftover food decays on the substrate and degrades water quality, which can lead to bacterial infections and barbel erosion. It is worth noting that Brochis pantanalensis is not an effective “clean-up crew” despite the persistent myth that catfish will keep the tank clean. These fish produce waste just like any other species and should be fed deliberately rather than being expected to subsist on scraps.

Behaviour and Temperament

Brochis pantanalensis is a peaceful, social species that poses no threat to any tank mate it cannot fit in its mouth – which, given its small mouth, means virtually every fish it is likely to encounter in a community aquarium. It spends the majority of its time on or near the substrate, methodically foraging through the sand, resting in shaded spots, and socialising with conspecifics.

This is an obligately social species. Keep Brochis pantanalensis in groups of at least six, ideally eight or more. In smaller numbers, the fish become visibly stressed, spending excessive time hiding and showing dulled colouration. In an appropriately sized group, individuals are bolder, more active, and display a wider range of natural behaviours. Groups will often rest together in a tight cluster, their bodies touching, and forage in loose formation across the tank floor.

Activity patterns tend to follow a crepuscular rhythm, with the most vigorous foraging occurring during the early morning and late evening. During the brightest part of the day, the group may retreat to shaded areas and become relatively still, though they will rouse themselves if food is offered. Occasional bursts of surface-dashing to gulp air are entirely normal and should not be a cause for concern unless they become very frequent, which may indicate low dissolved oxygen levels.

Brochis pantanalensis is not territorial and shows no aggression towards conspecifics or other species. Males may engage in mild jostling during spawning, but this never results in injury. The species is compatible with virtually any peaceful community fish, making it an excellent addition to a well-planned setup.

One behaviour worth noting is the species’ sensitivity to changes in barometric pressure. Like many corydoradine catfish, Brochis pantanalensis may become noticeably more active and agitated before storms or significant weather changes. Some aquarists report that large water changes with slightly cooler water can trigger similar excited behaviour, which is believed to mimic the onset of the rainy season and can stimulate spawning.

Tank Mates

Brochis pantanalensis is an exceptionally peaceful species that coexists harmoniously with a wide range of community fish. The ideal tank mates are other calm, non-aggressive species that occupy the middle and upper water columns, leaving the bottom layer to the Brochis. Avoid any fish large enough to view the catfish as prey, any species known for fin-nipping or territorial aggression towards bottom-dwellers, and any fish that require dramatically different water parameters.

Good tank mates

• Cardinal Tetra – A classic mid-water schooling fish that thrives in the same soft, slightly acidic conditions and adds vibrant colour above the Brochis.
• Rummy-nose Tetra – Another peaceful South American tetra that appreciates similar water parameters and occupies different tank zones.
• Ember Tetra – A tiny, gentle species that stays in the middle water column and will never bother bottom-dwelling catfish.
• Harlequin Rasbora – A calm, adaptable shoaling fish that mixes well in a community setup without competing for food at the bottom.
• Bristlenose Pleco – A fellow bottom-dweller that generally occupies different microhabitats, grazing on algae rather than sifting sand, and is peaceful towards corydoradines.
• Otocinclus – A small, algae-eating catfish that shares similar water requirements and coexists peacefully with Brochis.
• Honey Gourami – A gentle, slow-moving surface and mid-water species that adds variety without any risk of aggression.
• Kuhli Loach – Another peaceful bottom-dweller that occupies slightly different substrate niches and complements Brochis well in a soft-substrate tank.
• Corydoras sterbai – While a different genus, sterbai corys share very similar care needs and will peacefully coexist alongside Brochis, though they tend to shoal separately.

Fish to avoid

• Oscar – Far too large and predatory; would view Brochis pantanalensis as food once fully grown.
• Jack Dempsey – An aggressive cichlid that defends territory vigorously and could injure or kill bottom-dwelling catfish.
• Tiger Barb – A known fin-nipper that can harass slower-moving bottom-dwellers, causing stress and potential injury.
• Red-tail Catfish – A massive predatory catfish that is entirely incompatible with any small community species.
• Convict Cichlid – Highly territorial, especially when breeding, and will aggressively chase catfish away from the bottom of the tank.
• Green Terror – A large, aggressive cichlid whose territorial behaviour poses a serious threat to peaceful bottom-dwellers.

Breeding

Breeding Brochis pantanalensis in captivity is possible but considerably more challenging than breeding commonly spawned Corydoras species such as C. aeneus or C. paleatus. Successful breeding reports are relatively uncommon, and the species has a reputation for being reluctant to spawn without careful conditioning and environmental manipulation.

To attempt breeding, start with a well-established group of at least six to eight adults in excellent health. Condition the group for several weeks with a protein-rich diet heavy in live and frozen foods – bloodworm, daphnia, and brine shrimp are all valuable conditioning foods. Ensure water quality is impeccable throughout this period.

Spawning in corydoradine catfish is frequently triggered by environmental changes that simulate the onset of the rainy season. The most reliable technique involves performing a large water change (50% or more) with water that is slightly cooler than the tank temperature – a drop of 2-4 degrees Celsius. Some breeders also lower the barometric pressure in the room by other means, though the water change method is the most practical approach. Performing this water change in the evening, when the fish are naturally more active, can improve the chances of triggering a spawn.

If spawning occurs, the process follows the typical corydoradine “T-position” mating embrace. The female cups her ventral fins to hold a small clutch of eggs while the male fertilises them, and she then deposits the adhesive eggs onto a hard surface – typically the aquarium glass, broad plant leaves, or smooth decor. The eggs are relatively large compared to those of smaller Corydoras species, and a female may deposit anywhere from 50 to over 200 eggs in a single spawning event, laid in small batches over several hours.

Neither parent provides any care for the eggs after spawning, and there is a significant risk of the adults eating the eggs if left in the same tank. Most breeders transfer the eggs to a separate, smaller rearing tank with matching water parameters, gentle aeration, and a few drops of methylene blue to prevent fungal growth. The eggs typically hatch in 4-6 days depending on temperature. The fry are initially sustained by their yolk sacs and begin free-swimming within a day or two of hatching, at which point they can be offered infusoria, microworms, or commercially prepared liquid fry food. As they grow, transition to baby brine shrimp (Artemia nauplii) and finely crushed sinking pellets.

Fry growth is relatively slow compared to smaller Corydoras species, and it may take several months before the young fish are large enough to be safely introduced to the main tank.

Common Diseases

Brochis pantanalensis is generally a hardy species when kept in appropriate conditions, but like all aquarium fish, it is susceptible to several diseases, particularly when water quality deteriorates or the fish is stressed.

Barbel erosion is one of the most frequently encountered problems in corydoradine catfish. This condition manifests as a gradual shortening and deterioration of the barbels, which can eventually erode to stumps. The primary causes are coarse or sharp substrates that physically abrade the barbels and poor water quality – particularly elevated nitrate levels or bacterial contamination of the substrate. Prevention is straightforward: use fine, smooth sand and maintain excellent water quality. Once the barbels have eroded significantly, regrowth is limited, so prevention is far better than treatment.

White spot disease (ichthyophthirius, or “ich”) is a common parasitic infection that presents as small white cysts on the body and fins. Corydoradine catfish are sensitive to many medications, particularly those containing copper or formalin. If treating Brochis pantanalensis for ich, use half the standard dose of any medication and monitor closely, or opt for the heat treatment method – gradually raising the temperature to 30 C for 10-14 days while increasing aeration. Always check that any medication is labelled as safe for scaleless or sensitive fish.

Bacterial infections, including fin rot and skin ulcers, can occur when water quality is poor or when the fish sustains an injury. These typically present as reddened areas, frayed fins, or open sores. Improving water quality through increased water changes is often sufficient to resolve mild cases. More severe infections may require treatment with a broad-spectrum antibacterial medication safe for sensitive catfish.

Internal parasites can occasionally be a problem, particularly in wild-caught specimens. Symptoms include weight loss despite normal feeding, white or stringy faeces, and a hollow-bellied appearance. Quarantining new fish for at least two to four weeks before adding them to an established tank helps prevent the introduction of parasites and other diseases.

Fungal infections, recognisable by cotton-like white growths on the body or fins, are usually secondary to an existing wound or weakened immune system. Anti-fungal treatments are available, but again, use products suitable for sensitive species and dose conservatively.

FAQs

Is Brochis pantanalensis the same as a Corydoras?

Brochis pantanalensis belongs to the genus Brochis, which is closely related to Corydoras but distinct. The 2024 taxonomic revision maintained the separation of these taller-bodied species within Brochis. In practical terms, care requirements are very similar to Corydoras species, and the two genera can be kept together in the same aquarium without issue. However, they will generally shoal with their own species rather than mixing into a single group.

How many Brochis pantanalensis should I keep together?

A minimum of six is essential, as this is an obligately social species that suffers significant stress when kept alone or in very small numbers. Groups of eight to twelve are preferable and will result in bolder, more active fish that display a much wider range of natural behaviours. In a sufficiently large tank, there is no upper limit – larger groups simply produce better results.

Can I keep Brochis pantanalensis on gravel?

It is strongly recommended that you use fine, smooth sand rather than gravel. Brochis pantanalensis constantly sifts through the substrate with its sensitive barbels, and coarse or sharp gravel can cause barbel erosion and mouth injuries over time. If you must use gravel, ensure it is very fine-grained and has smooth, rounded edges, but sand remains the superior choice for this species.

Why does my Brochis pantanalensis keep darting to the surface?

Occasional surface-dashing to gulp air is completely normal behaviour for all corydoradine catfish. They possess a modified intestine that can absorb atmospheric oxygen, and they will use this ability periodically even in well-oxygenated water. However, if the behaviour becomes very frequent – multiple times per minute or involving the entire group simultaneously – it may indicate low dissolved oxygen levels in the water. Check your aeration, filtration flow, and water temperature, as warmer water holds less oxygen.

Is Brochis pantanalensis suitable for a planted tank?

Yes, this species is an excellent inhabitant for a planted aquarium. It does not eat or uproot plants, and the soft sand substrate required for its barbels is also well-suited to many popular aquarium plants. The fish’s gentle foraging actually helps aerate the upper layers of the substrate, which can benefit plant root systems. Dense peripheral planting with open foraging areas in the centre creates an ideal layout for both the fish and the plants.

Related Guides

• Emerald Catfish (Brochis splendens) – The most commonly kept Brochis species and a close relative that shares nearly identical care requirements.
• Corydoras sterbai – A popular corydoradine catfish that makes an excellent companion species and thrives in similar conditions.
• Bronze Corydoras (Corydoras aeneus) – One of the most widely available and beginner-friendly corydoradine species, useful as a comparison for care requirements.
• Peppered Corydoras (Corydoras paleatus)