Pimelodidae (Long-whiskered Catfishes)

Slime Catfish

Brachyplatystoma platynema

The scientific name Brachyplatystoma platynema is assigned to the slime catfish, a representative of the family Pimelodidae (long-whiskered or flat-headed catfishes). Fishermen gave it this unusual name because bubbles appear around its mouth when a fisherman pulls the catfish out of the water and it tries to breathe air. This is an important commercial species for the local population. Beginner aquarists should not choose this catfish.

Tank
from 1000 L (264 gal)
Temperature
22 – 28 °C (72 – 82 °F)
Size in aquarium
50 – 117 cm (20 – 46 in)
Acidity
pH 6–8

Predator: dangerous to small fish

Natural rangeRange on the map
  • South America area
  • Bolivia
  • Brazil
  • Colombia
  • Ecuador
  • Peru
  • Venezuela

Tank conditions

Plan the tank stocking
Temperature
22 – 28 °C (72 – 82 °F)
Water pH
Slightly acidic (6) – Slightly alkaline (8)
Water dH
Very soft (1) – Very hard (21)
Water salinity
no salt (freshwater)
Size in aquarium
50 – 117 cm (20 – 46 in)
Lifespan
15 years
Temperament
Predator, but semi-peaceful gets along with large ones
Toward small fish
predator
Required aquarium volume
from 1000 L (264 gal)
Lighting
dimmed
Substrate
coarse sand coarse sand / gravel / pebbles
Water flow
any
Feeding
Meat / protein live, frozen, fresh
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

Adults grow to an impressive length, reaching approximately 1 meter. Young catfish exhibit a dark coloration with a characteristic spotted pattern, which gradually fades as they mature. Eventually, the upper body takes on light gray or brown hues, while the underside becomes light. The fish's body is elongated and muscular, ending in a flat head with large barbels. The caudal fin is large and forked, with elongated outer rays. Visible differences between male and female are minimal, indicating weak sexual dimorphism.

Habitat

The natural habitat of this species is in South America, where it is widely distributed throughout most of the Amazon and Orinoco river basins. The catfish inhabits the deep channels of the main rivers, not being tied to a specific biotope. Throughout the year, these fish migrate from the estuary to the headwaters, covering distances of over 5000 km, making their migrations among the longest for freshwater fish.

Behavior and Compatibility

Despite its predatory diet, this species is characterized by a peaceful disposition and can coexist with other aquarium inhabitants, provided they are large enough not to fit into its mouth. However, it should be understood that any small fish will likely become its prey.

Care and Maintenance

Due to the significant size of adult fish, their keeping will require very large aquariums, holding thousands of liters of water. Such setups, along with decorations and necessary equipment, will weigh several tons, and their maintenance and upkeep entail significant time and financial costs. All of this puts the slime catfish beyond the scope of ordinary amateur aquaristics. The choice of design decoration is not very important, as complex decor is not needed and can be quickly destroyed by the catfish. This catfish will look most organic against a sandy or rocky substrate, among large snags and boulders, provided subdued lighting. Maintaining high water quality is ensured by a strict aquarium maintenance regimen, as well as powerful filtration systems, which sometimes occupy an entire room.

Diet

In nature, this carnivorous species feeds exclusively on other fish. However, in aquarium conditions, it can often be accustomed to a diet alternative to live prey. Examples include shrimp, mussels, as well as pieces of squid and fish meat. Feeding frequency is usually once a week.

Breeding and Reproduction

To date, there have been no recorded successful cases of breeding slime catfish in artificial aquarium environments. Young individuals are usually supplied by direct capture from their natural waters.

Diseases

Most health problems in fish often arise from unsuitable keeping conditions. Maintaining a stable and comfortable habitat is a key factor for successful keeping. If symptoms of illness appear, the first step is to check the water quality. If deviations are found, it is important to take immediate measures to eliminate them. If the symptoms do not disappear or worsen, medicinal treatment may be required.

How to choose

The acquisition of this species entails high responsibility due to its impressive size, reaching 1 meter in length. In a pet store, only active individuals without visible skin damage, ulcers, or signs of fungal infections should be selected. It is important to ensure the absence of fin and barbel deformities, as well as clear eyes. Due to specific needs for space and water quality, this species is not recommended for keeping in ordinary home aquariums. The buyer must already have a specialized life support system of thousands of liters, as the transportation and adaptation of adult individuals are extremely difficult.

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 Slime Catfish get?

An adult reaches 50–117 cm in length. Plan the tank around the maximum size: the fish quickly outgrows a cramped setup.

What size aquarium does Slime Catfish need?

The recommended volume is 1000 L. A smaller tank speeds up nitrate build-up and raises stress levels.

What water parameters does Slime Catfish need?

Temperature 22–28 °C, pH 6–8, hardness 1–21 dGH. Stability matters more than exact values: sudden swings are harder on the fish than a small deviation from the ideal.

How long does Slime Catfish live?

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

Is Slime Catfish aggressive?

Temperament: predator, but semi-peaceful (gets along with large ones). This is a predatory species — any fish small enough to fit in its mouth will eventually be eaten.

How many Slime Catfish should be kept together?

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

What does Slime Catfish eat?

Diet type: meat / protein (live, frozen, fresh). Feed small portions that are finished within a couple of minutes — overfeeding does more harm than underfeeding.

What is the scientific name of Slime Catfish?

The scientific name of the species is Brachyplatystoma platynema, family Pimelodidae (Long-whiskered Catfishes). It also appears in the literature as: Goslinia platynema, Taenionema steerei.

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Other scientific names and conservation status

Other scientific names
Goslinia platynema, Taenionema steerei
Categories
Catfish, Giants
Conservation status
Least concernLC