Doradidae (Thorny Catfishes)

Blue-eyed Platydoras

Platydoras hancockii

Platydoras hancockii, also known as the Blue-eyed Platydoras, is a member of the Doradidae family, or Thorny Catfishes. This species of catfish originates from the vast waters of South America, where it can be found throughout the Amazon River basin—from Guyana and the eastern territories of Brazil to Peru and Bolivia.

Tank
from 130 L (34 gal)
Temperature
23 – 28 °C (73 – 82 °F)
Size in aquarium
15 cm (5.9 in)
Acidity
pH 6–8
Natural rangeRange on the map
  • Orinoco River Basin
  • Rio Negro Basin
  • Essequibo River Basin
  • Demerara River Basin
  • Bolivia
  • Brazil
  • French Guiana
  • Guyana
  • Peru

Tank conditions

Plan the tank stocking
Temperature
23 – 28 °C (73 – 82 °F)
Water pH
Slightly acidic (6) – Slightly alkaline (8)
Water dH
Soft (5) – Very hard (19)
Water salinity
no salt (freshwater)
Size in aquarium
15 cm (5.9 in)
Lifespan
15 years
Temperament
Peaceful (regular)
Toward small fish
not a predator
Required aquarium volume
from 130 L (34 gal)
Lighting
dimmed
Substrate
any (no restrictions)
Water flow
weak or moderate
Feeding
Sinking (any)
Keeping
Both solitary and in group flexible
  • Lifespan. A lifespan to expect under good care, not a measured value: it depends heavily on tank volume, water quality and diet — and for selectively bred forms, on their origin as well.
  • Toward small fish. Based on the Predators category in the catalog or the temperament in the species parameters. “A risk to small fish” means the species is not a predator by habit, yet will swallow any fish that fits in its mouth.
  • Required aquarium volume. This is a husbandry recommendation, not a measured value: the volume depends on the keeping mode (both solitary and in group (flexible)), footprint, decor and tank mates.

Care and keeping

Description

Adult specimens of this catfish can reach a length of up to 15 cm. Their bodies are covered with strong bony plates, forming reliable armor. The head and pectoral regions of the catfish form a continuous carapace, and a row of sharp spines can be observed along the lateral line. Their fins are rigid, with the first rays transformed into pointed blades. The coloration of the Blue-eyed Platydoras is dark gray, with a distinct light line running along the entire body. Males are distinguished by a more slender build compared to females.

Habitat

The species inhabits the northern part of South America, including the Amazon, Rio Negro, Essequibo and Demerara river basins. In nature, it is found in freshwater coastal swamps, silty forest lakes, and river areas subject to seasonal flooding. It is a demersal fish, leading a secretive lifestyle in the bottom layers of the water, where it prefers to stay among roots, fallen leaves, and other natural shelters.

Behavior and Compatibility

This catfish is characterized by a calm and non-aggressive disposition. The Blue-eyed Platydoras gets along perfectly with most other species of aquarium fish, even with those that do not always show friendliness to their neighbors. Thanks to its strong armor, it is reliably protected from potential predators, which allows it to be kept not only with peaceful species. It feels comfortable both alone and in a group of its own kind.

Care and Maintenance

For keeping a single catfish, an aquarium of at least 130 liters is recommended. The most important element of the decor is a sufficient number of shelters where the fish can completely hide. These can be crevices, caves, or grottoes formed by driftwood or rock piles. Platydoras prefers subdued lighting, so it will seek refuge during the day. This catfish is completely safe for plants, so most rooted and floating species can be used for decoration. It is unpretentious and easily adapts to a wide range of hydrochemical parameters, which greatly simplifies its care. However, despite this, it is necessary to regularly perform essential procedures: weekly partial water changes, removal of organic waste, and preventive maintenance of equipment.

Diet

The diet of the Blue-Eyed Platydoras is omnivorous; it readily accepts most common foods. The fish will pick up anything it finds on the bottom, be it dry flakes, granules, live, or frozen foods. Most feeding occurs at night.

Breeding and Reproduction

Reproduction in captivity is not well studied. It is known that in nature, the fish build a nest of air bubbles and fragments of aquatic plants near the water surface. The male cares for the offspring, guarding the clutch. Spawning stimulation in aquarium conditions is difficult, so successful cases of obtaining fry are extremely rare.

Diseases

The species has high resistance to unfavorable environmental conditions, which is due to its natural ability to survive when water bodies dry up. No specific diseases characteristic only of this catfish have been identified. The main dangers are mechanical skin damage during transportation or careless netting, as well as the risk of burns from contact with heating elements of aquarium equipment.

How to choose

When choosing individuals, attention should be paid to the integrity of the bony plates and fins, the absence of visible wounds, ulcers, or white film on the body. A healthy fish should show activity at dusk and have clear eyes. It is recommended to avoid purchasing specimens with signs of emaciation or damaged barbels. It should be noted that under stress or fright, catfish can make characteristic sounds, which is a natural reaction of the species.

Compatibility

There are no pair reviews for this species yet — check tankmates in the matcher.

All tankmates

Plants and this fish

Matching water does not mean the plant will stay intact.

Frequently asked questions

The essentials: size, tank volume, water parameters and care

How big does Blue-eyed Platydoras get?

An adult reaches 15 cm in length. Plan the tank around the maximum size: the fish quickly outgrows a cramped setup.

What size aquarium does Blue-eyed Platydoras need?

The recommended volume is 130 L. A smaller tank speeds up nitrate build-up and raises stress levels.

What water parameters does Blue-eyed Platydoras need?

Temperature 23–28 °C, pH 6–8, hardness 5–19 dGH. Stability matters more than exact values: sudden swings are harder on the fish than a small deviation from the ideal.

How long does Blue-eyed Platydoras live?

Around 15 years when kept properly. Lifespan depends directly on tank volume, water quality and a varied diet.

Is Blue-eyed Platydoras aggressive?

Temperament: peaceful (regular). Keep this in mind when choosing tank mates.

How many Blue-eyed Platydoras should be kept together?

Recommended setup: both solitary and in group (flexible). Ignoring this is a common cause of stress and disease.

What does Blue-eyed Platydoras eat?

Diet type: sinking (any). Feed small portions that are finished within a couple of minutes — overfeeding does more harm than underfeeding.

What is the scientific name of Blue-eyed Platydoras?

The scientific name of the species is Platydoras hancockii, family Doradidae (Thorny Catfishes). It also appears in the literature as: Amblydoras hancockii, Doras hancockii.

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Other scientific names and conservation status

Other scientific names
Amblydoras hancockii, Doras hancockii
Categories
Catfish
Conservation status
Least concernLC