One of the largest freshwater fish in the world, native to the Amazon Basin. It is a highly active, migratory apex predator. This 'Monster Fish' is almost entirely unsuitable for home aquaria, requiring an enormous, custom-built heated indoor pool or public aquarium setting for its adult life stage.
Piraiba At a Glance
Piraiba Tank Requirements
Will Piraiba fit in your tank?
Care guides tell you what Piraiba needs, the next question is whether your tank can safely provide it. Test Piraiba against your tank size, maintenance needs, and the fish you already keep before you buy.
Piraiba Water Parameters
Piraiba Temperament & Compatibility
Piraiba Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard (Adult)
The true adult form. A gargantuan apex predator that can easily exceed 2.5 meters. Requires immense swimming space, high oxygenation, and powerful filtration capable of handling enormous biolloads.
Differs in 1 trait from base species
Also known as: Adult Piraiba, Monster Fish
Juvenile (Grow-out)
Typical sale size in the aquarium trade. Do not be fooled by their small initial size; they have an explosive growth rate. A juvenile requires immediate planning for a pond-scale upgrade within its first year.
Differs in 4 traits from base species
Also known as: Baby Piraiba, Grow-out, Juvenile
Piraiba Care Guide Summary
The Piraiba, scientifically known as Brachyplatystoma filamentosum, belongs to the Catfish family group. Adults reach a maximum size of approximately 250 cm and have a fusiform body shape with a fast growth rate. Classified as aggressive, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a extreme level of biological waste.
To thrive, the Piraiba requires a freshwater only aquarium with a minimum volume of 30000 litres and a tank length of at least 600 cm. Water temperature should be maintained between 24°C and 29°C, with a pH range of 6–7.5 and a general hardness of 2–15 dGH. A high water flow is preferred.
Due to its specialist needs, the Piraiba is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Standard (Adult) and Juvenile (Grow-out). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Piraiba Habitat Setup
When setting up an aquarium for the Piraiba, a high water flow best suits their natural preferences. Because this species occupies the mid-level and bottom zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour and smooth gravel or rounded substrate to protect their sensitive barbels. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Piraiba Compatibility Notes
Classified as aggressive, the Piraiba is best housed alone, as they do not tolerate others of their kind in confined spaces. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten, shy or slow-feeding tankmates may be outcompeted at feeding time, and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the mid-level and bottom zones can help reduce competition and territorial overlap.
Who Piraiba Is Actually For
Piraiba is best for a fishkeeper who expects a species with attitude and plans the tank around that behavior and can provide someone who understands its individual space requirements. It makes the most sense for a hobbyist who will actually build around its needs, especially sand.
The most common mistake is treating Piraiba like any other community fish and skipping the soft sand it needs to forage safely. Another frequent problem is forcing it into an over-busy community when it would do better with more room or more deliberate tankmate choices.
Piraiba Feeding & Diet Considerations
The Piraiba is a predatory species that will readily consume small fish, so nano or bite-sized tankmates should be avoided and is an aggressive eater that may prevent timid tankmates from getting enough food, so target feeding or simultaneous feeding at opposite ends of the tank can help.
Frequently Asked Questions About Piraiba
How big does Piraiba get?
Piraiba (Brachyplatystoma filamentosum) typically reaches a maximum adult size of approximately 250 cm. They have a fusiform body shape and a fast growth rate.
What tank size does Piraiba need?
A minimum aquarium volume of 30000 litres and a tank length of at least 600 cm are recommended for Piraiba. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Piraiba need?
Piraiba thrives in freshwater only conditions with a temperature range of 24–29°C, a pH between 6 and 7.5, and a general hardness of 2–15 dGH. A high water flow is preferred.
Is Piraiba peaceful or aggressive?
Piraiba is classified as aggressive with an aggression score of 7 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Piraiba live with others of its kind?
No. Only one Piraiba should be kept per tank. Keeping multiples in the same aquarium typically results in aggression and stress.
Does Piraiba have any special tank requirements?
Yes. Piraiba benefits from sand (sifters) and smooth gravel (sensitive barbels) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Piraiba need a lid on the tank?
Yes. Piraiba is a known jumper, and a tight-fitting lid or cover is essential to prevent escape. Even a small gap can be enough for a determined fish to leap out.
Useful setup supplies
We may earn from qualifying purchases
Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 7, 2026
- Last updated
- May 7, 2026
- Issues or corrections?
- Contact the editorial team
Plants That Suit Piraiba
These plants pair well with Piraiba based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
African Water Fern
Bolbitis heudelotii
Boivin's Aponogeton
Aponogeton boivinianus
Capuron's Aponogeton
Aponogeton capuronii
Madagascar Lace Plant
Aponogeton madagascariensis
African Onion Plant
Crinum calamistratum
Afzel's Anubias
Anubias afzelii
Fish Similar to Piraiba
Arapaima
Arapaima gigas
One of the largest true freshwater fish in the world, native to the Amazon basin. Arapaima are obligate air-breathers and extreme predators. Due to their massive adult size and explosive growth rate, they are almost entirely unsuited for home aquaria and require highly specialized, heated, pond-sized enclosures.
Dourada
Brachyplatystoma rousseauxii
The Dourada is a truly massive, highly predatory migratory catfish native to the Amazon and Orinoco basins. Known for its silvery-gold sheen and the longest freshwater migration of any fish in the world. In captivity, it is a 'monster fish' that requires a massive custom aquarium or indoor pond. It is exclusively piscivorous and will swallow any fish that fits in its immense mouth.
Chao Phraya Giant Catfish (Paroon Shark)
Pangasius sanitwongsei
An apex predator native to the Mekong and Chao Phraya basins. This true 'monster fish' is completely unsuitable for home aquariums. They grow to massive proportions, are highly active, and easily startled—often severely injuring themselves by crashing into tank walls. They possess a massive appetite and are highly piscivorous, consuming any tank mate that fits in their mouth.
Helicopter Catfish
Wallagonia leerii
A massive, apex predator catfish native to Southeast Asia. Known for its enormous mouth and voracious appetite, this 'monster fish' is completely unsuitable for standard home aquariums. In the wild, they migrate through large rivers and flooded forests. They will consume any tankmate that fits in their massive mouth. Kept almost exclusively by specialized monster fish keepers or public aquaria.
Indonesian Giant Snakehead
Channa micropeltes
One of the largest, most aggressive, and predatory freshwater fish in the world. The Giant Snakehead is an apex predator equipped with a labyrinth organ, allowing it to breathe atmospheric air. In captivity, they require massive, heavily secured indoor ponds or custom ultra-large aquariums. They possess crushing jaw strength and will consume or brutally attack almost any tank mate.
Red-Tail Catfish
Phractocephalus hemioliopterus
A massive, fast-growing predatory catfish from the Amazon basin. Famous for its voracious appetite, bulldozer-like behavior, and distinct red caudal fin. Due to its enormous adult size (often exceeding 4 feet), it is strictly a 'monster fish' that requires a heated indoor pond or a colossal custom aquarium. It is highly predatory and will swallow absolutely any tank mate that can fit into its cavernous mouth.