CW005 Gold-Bridled Cory Catfish – Corydoras Aurofrenatus

The CW005 Gold-Bridled Cory Catfish (Corydoras aurofrenatus) is an unusual South American armored catfish that stands apart from many familiar Cory species because of its noticeably longer, more pointed snout.

Also known as the Gold-Bridled Cory, Goldhead Cory, CW005 Cory, or historically under the name Corydoras ellisae, this species belongs to the long-snouted lineage of true Corydoras.

Its body is usually pale cream, yellowish, silver, or light brown with several dark patches along the sides. Live fish may also display attractive greenish-yellow iridescence, while the caudal fin can develop multiple narrow dark bars.

The elongated snout is more than a visual feature. Gold-Bridled Corys use it to probe and sift through soft substrate while searching for small edible organisms, making fine sand especially important for natural aquarium behavior.

Taxonomy note: Unlike many short-snouted Cory species that were moved into genera such as Hoplisoma or Osteogaster during the modern Corydoradinae revision, this species belongs to Lineage 1 and remains in the genus Corydoras. Its accepted scientific name remains Corydoras aurofrenatus.

CW005 Gold-Bridled Cory Catfish Care Information

What Does a CW005 Gold-Bridled Cory Look Like?

The Gold-Bridled Cory has a noticeably elongated, pointed snout that immediately separates it from short-faced species such as Panda, Sterbai, or Bronze Corys.

The base body color is generally pale yellow, cream, brownish-yellow, or silver, with a darker upper head and snout.

Along the middle of the body are usually two or three dark brown-to-black patches. The first appears below the dorsal-fin region, the second below the adipose-fin region, and a third smaller or more diffuse marking may occur near the base of the tail.

The caudal fin can display multiple narrow transverse dark bars, while healthy live specimens may develop subtle greenish-yellow iridescence over the lighter base color.

Why Is Corydoras Aurofrenatus Called the Gold-Bridled Cory?

The scientific name aurofrenatus is associated with the Latin words for gold and bridled.

The name refers to the yellow or golden coloration across the snout and head region, historically described as a broad yellow band across the snout.

This facial coloration, combined with the elongated snout, inspired the aquarium names Gold-Bridled Cory and Goldhead Cory.

What Makes CW005 a Long-Snouted Cory?

CW005 belongs to the classic long-snouted or saddle-snouted Corydoras lineage.

Rather than having the short rounded head seen in many popular Corys, Corydoras aurofrenatus has a noticeably longer and more pointed facial profile.

This shape is associated with a probing style of feeding. The fish can push its snout into fine substrate while searching for small worms, insect larvae, crustaceans, and other edible material.

For this reason, fine sand is especially valuable for CW005. Coarse or sharp substrate can interfere with natural probing behavior and may damage sensitive barbels and the snout.

What Does CW005 Mean?

CW005 is a Corydoras World identification number used in the aquarium hobby for this Gold-Bridled Cory form.

Specialist aquarium references now identify CW005 with Corydoras aurofrenatus, allowing the coded hobby designation and formal scientific species name to be used together.

The CW005 number remains useful because many collectors, breeders, and specialty fish keepers continue to search for the fish by its historical identification code.

Is Corydoras Ellisae the Same as Corydoras Aurofrenatus?

Yes. Older aquarium and scientific references may list Corydoras ellisae as a separate species.

However, detailed taxonomic study found no reliable characters that consistently separate C. ellisae from C. aurofrenatus.

A comprehensive 2020 revision of the long-snouted Corydoras from the Río de la Plata system formally corroborated this synonymy.

Corydoras aurofrenatus is the valid senior name, while Corydoras ellisae is treated as a junior synonym.

Why Is Corydoras Aurofrenatus Still a Corydoras?

Recent Cory taxonomy moved many familiar aquarium species out of Corydoras and into genera such as Hoplisoma, Osteogaster, Gastrodermus, and Brochis.

CW005 is different because Corydoras aurofrenatus belongs to Lineage 1, the lineage that contains the type species of the genus Corydoras.

As a result, its scientific name remains Corydoras aurofrenatus.

Where Do Gold-Bridled Cory Catfish Come From?

Corydoras aurofrenatus is associated with the Paraguay River basin.

The species was originally described from Paraguay near Arroyo Trementina, a tributary associated with the Río Aquidabán system.

Modern taxonomic work has verified populations from tributaries of the Río Paraguay in both Paraguay and Brazil.

Published records have also mentioned Argentina and Bolivia, although some of those historical records have not been confirmed through examined voucher specimens.

Natural Habitat of Corydoras Aurofrenatus

Gold-Bridled Corys have been recorded from a variety of freshwater habitats within the Paraguay River system, from relatively small tributary streams to larger river channels.

Documented habitats can include slow-moving or nearly still water with soft clay, sand, and organic material along the bottom.

In an aquarium, the most important feature to reproduce is a soft substrate that allows natural snout-probing behavior.

Fine sand combined with driftwood, roots, live plants, dried leaves, and shaded areas creates an excellent natural-style setup.

CW005 Gold-Bridled Cory Behavior & Group Size

Gold-Bridled Corys are social fish and should be maintained with members of their own species.

Keep at least 6 CW005 Gold-Bridled Corys together. A proper group encourages more natural foraging, social interaction, and confident aquarium behavior.

Long-snouted Cory species can sometimes be slightly more assertive with one another than the familiar short-snouted Corys. Short chasing or minor disputes may occasionally occur, especially around food or during reproductive activity.

They are not predatory community bullies, but providing adequate floor space, visual cover, and multiple feeding areas is recommended.

Like other Corydoradinae catfish, CW005 may occasionally make a rapid trip to the water surface to gulp atmospheric air. Occasional surface visits are normal behavior.

Ideal Aquarium Setup for CW005 Gold-Bridled Cory

A 20-gallon long aquarium or larger provides a practical starting point for a group of six Gold-Bridled Corys.

Horizontal bottom space is important because this species spends much of its time exploring and probing the substrate.

A fine sand substrate is strongly recommended. This is especially important for long-snouted Corys because they naturally insert their snouts into the substrate while searching for food.

Driftwood, smooth stones, roots, dried leaves, and live plants can provide visual cover while open sandy areas give the group plenty of room to forage.

If multiple individuals display territorial or competitive behavior, use wood and plants to break up sight lines and provide multiple feeding areas.

CW005 Gold-Bridled Cory Water Parameters

Gold-Bridled Cory Catfish generally do well at temperatures around 72–79°F (22–26°C).

A practical aquarium pH range is approximately 6.0–8.0, with soft to moderately hard water suitable for most captive maintenance.

More important than continually adjusting water chemistry is providing stable, clean, well-oxygenated conditions.

Keep CW005 in a fully cycled aquarium with effective biological filtration and regular water changes. Ammonia and nitrite should remain at zero.

What Do CW005 Gold-Bridled Cory Catfish Eat?

Corydoras aurofrenatus is an omnivorous benthic forager that naturally searches through the substrate for edible material.

Feed a varied aquarium diet containing:

• High-quality sinking pellets or granules
• Bottom-feeder tablets
• Frozen or live bloodworms
• Blackworms
• Tubifex
• Brine shrimp
• Daphnia

Scattering some food over the sandy bottom encourages the fish to use their natural probing and searching behavior.

CW005 Gold-Bridled Cory Tank Mates

Gold-Bridled Corys can be maintained with carefully selected peaceful freshwater fish that share similar temperature and water requirements.

Potential tank mates may include peaceful tetras, pencilfish, rasboras, smaller barbs, peaceful dwarf cichlids, and other appropriately sized community species.

Because long-snouted Corys can be somewhat more assertive than many short-snouted species, provide adequate space if mixing CW005 with other bottom-dwelling catfish.

Avoid large predatory fish, highly aggressive bottom dwellers, and extremely competitive species that prevent the Cory group from feeding normally.

Male vs. Female CW005 Gold-Bridled Cory

Mature males and females become easier to distinguish once the fish reach adult size.

Males generally remain somewhat smaller and slimmer, reaching approximately 2 inches.

Females may reach around 2.2–2.25 inches and become broader and rounder through the abdomen, especially when viewed from above.

Mature males can also develop specialized structures associated with reproductive condition, but body shape remains the easiest visual difference for most aquarium keepers.

Why Choose CW005 Gold-Bridled Cory Catfish?

• Distinctive long, saddle-shaped snout
• Golden-yellow facial or “bridle” coloration
• Two to three characteristic dark flank patches
• Attractive finely banded caudal fin
• Subtle greenish-yellow iridescence in healthy adults
• Interesting sand-probing feeding behavior
• Historic CW005 collector identification
• True Lineage 1 Corydoras that retains the Corydoras genus
• Excellent specialty species for Cory collectors

CW005 Gold-Bridled Cory Catfish FAQ

What is a CW005 Gold-Bridled Cory Catfish?

CW005 Gold-Bridled Cory is the aquarium fish identified as Corydoras aurofrenatus, a long-snouted Cory from the Paraguay River basin known for its yellow-gold head coloration, dark flank patches, and finely banded tail.

Is CW005 Corydoras aurofrenatus?

Specialist aquarium references identify CW005 as Corydoras aurofrenatus. The CW005 code remains commonly used by breeders, collectors, and retailers even though the fish already has a formal scientific species name.

Why is it called the Gold-Bridled Cory?

The name refers to the yellow or golden coloration across the snout and head. The species name aurofrenatus combines roots associated with “gold” and “bridled.”

Is Corydoras ellisae the same as Corydoras aurofrenatus?

Yes. Modern taxonomic study treats Corydoras ellisae as a junior synonym of Corydoras aurofrenatus. A detailed 2020 revision confirmed that the two cannot be reliably separated as different species.

Is Corydoras aurofrenatus now a Hoplisoma?

No. Corydoras aurofrenatus belongs to the long-snouted Lineage 1 group and remains in the genus Corydoras. It should not be renamed Hoplisoma aurofrenatus.

How big do CW005 Gold-Bridled Corys get?

Adults generally reach around 2–2.25 inches. Mature females are typically larger and broader-bodied than males.

How many Gold-Bridled Corys should be kept together?

Keep CW005 in a group of at least 6 fish. Social groups encourage more natural foraging and confident behavior.

Does CW005 need a sand substrate?

Fine sand is strongly recommended. CW005 is a long-snouted Cory that naturally probes into the substrate while feeding, so soft sand allows much more natural behavior than sharp or coarse gravel.

What temperature is best for Gold-Bridled Corys?

A practical aquarium temperature range is approximately 72–79°F (22–26°C), with a pH around 6.0–8.0.

Where do CW005 Gold-Bridled Cory Catfish come from?

Corydoras aurofrenatus is native to the Paraguay River basin. Verified scientific records include tributaries in Paraguay and Brazil, with the original type locality near Arroyo Trementina in Paraguay.

Are CW005 Gold-Bridled Corys peaceful?

They are generally suitable with peaceful community fish, although long-snouted Corys can be somewhat more assertive toward members of their own or closely related species than many short-snouted Corys. Provide adequate bottom space and several feeding areas.

What do CW005 Gold-Bridled Cory Catfish eat?

Gold-Bridled Corys are omnivorous benthic foragers. Feed quality sinking pellets, granules, or tablets supplemented with frozen or live foods such as bloodworms, blackworms, Tubifex, brine shrimp, and daphnia.

Do Gold-Bridled Corys clean the aquarium?

No Cory should be treated simply as an aquarium cleaner. CW005 naturally searches the substrate for food but still requires intentional feeding. Regular water changes, substrate maintenance, and normal aquarium cleaning remain necessary.