The Payara, commonly known as the Vampire Tetra, is a formidable predatory fish famous for its prominent, sabre-like fangs used to spear prey. Native to fast-flowing rivers and rapids in the Amazon basin, they require enormous aquariums with pristine, highly oxygenated water and massive filtration. As strict piscivores, they will consume any fish small enough to fit in their mouths. Due to their enormous size and specialized needs, they are only suitable for expert aquarists with massive custom aquariums.
Payara At a Glance
Payara Tank Requirements
Will Payara fit in your tank?
Care guides tell you what Payara needs, the next question is whether your tank can safely provide it. Test Payara against your tank size, maintenance needs, and the fish you already keep before you buy.
Useful setup supplies
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Payara Water Parameters
Water care products
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Payara Temperament & Compatibility
Payara Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Adult (Standard)
Adult Payara are solitary and require massive custom aquariums (250+ gallons minimum). They need extremely strong water flow and high dissolved oxygen to replicate riverine conditions. Any tankmates must be similarly robust and too large to be considered prey.
Differs in 1 trait from base species
Also known as: Monster Fish, Full Grown
Juvenile (Grow-out)
Juveniles are often sold around 10-15cm (4-6 inches) and can be temporarily housed in smaller grow-out tanks. However, they grow rapidly and will quickly require a massive upgrade. Juveniles may tolerate small shoals of their own kind but become solitary and highly intolerant of conspecifics as they mature.
Differs in 4 traits from base species
Also known as: Baby Payara, Small Vampire Tetra
Payara Care Guide Summary
The Payara, scientifically known as Hydrolycus scomberoides, belongs to the Characins family group. Adults reach a maximum size of approximately 76 cm and have a fusiform body shape with a fast growth rate. Classified as aggressive, this species primarily occupies the mid-level zone of the aquarium and produces a extreme level of biological waste.
To thrive, the Payara requires a freshwater only aquarium with a minimum volume of 1000 litres and a tank length of at least 240 cm. Water temperature should be maintained between 24°C and 28°C, with a pH range of 6–7.5 and a general hardness of 4–15 dGH. A high water flow is preferred.
Due to its specialist needs, the Payara is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Adult (Standard) 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.
Payara Habitat Setup
When setting up an aquarium for the Payara, a high water flow best suits their natural preferences. Because this species occupies the mid-level zone, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement. Useful additions include 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.
Payara Compatibility Notes
Classified as aggressive, the Payara is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the mid-level zone can help reduce competition and territorial overlap.
Feeding products
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Frequently Asked Questions About Payara
How big does Payara get?
Payara (Hydrolycus scomberoides) typically reaches a maximum adult size of approximately 76 cm. They have a fusiform body shape and a fast growth rate.
What tank size does Payara need?
A minimum aquarium volume of 1000 litres and a tank length of at least 240 cm are recommended for Payara. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Payara need?
Payara thrives in freshwater only conditions with a temperature range of 24–28°C, a pH between 6 and 7.5, and a general hardness of 4–15 dGH. A high water flow is preferred.
Is Payara peaceful or aggressive?
Payara is classified as aggressive with an aggression score of 7 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Payara live alone?
Yes, Payara can be kept singly or in a group. They are flexible and adapt well to both setups.
Does Payara have any special tank requirements?
Yes. Payara benefits from smooth gravel (sensitive barbels) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Payara need a lid on the tank?
Yes. Payara 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.
Plants That Suit Payara
These plants pair well with Payara 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 Payara
Ember Tetra
Hyphessobrycon amandae
The Ember Tetra is a striking, fiery orange-red nano fish native to the Araguaia River basin in Brazil. Extremely peaceful and active, they are perfect for planted and blackwater aquariums. They are tight schoolers and must be kept in groups to feel secure and display their best colors.
Freshwater Shark (Wallago)
Wallago attu
An apex predator native to South and Southeast Asia, infamous for its immense size, huge mouth, and voracious predatory nature. It will consume any tank mate that fits into its capacious mouth and is known to bite aggressively when handled. This species is utterly unsuitable for standard home aquariums and requires an enormous custom pond or public aquarium setup.
Monster Wolf Fish (Aimara)
Hoplias aimara
An apex predator native to the fast-flowing rivers of South America. The Aimara is notorious for its incredible jaw strength, massive teeth, and unmatched aggression. It is arguably the most aggressive freshwater aquarium fish and will violently attack tankmates, equipment, and even the keeper's hands. It must be housed completely alone in a highly secure, massive aquarium with heavily weighted or lockable lids to prevent them from jumping or shattering the glass during feeding strikes.
Bucktooth Tetra (Exodon)
Exodon paradoxus
The Bucktooth Tetra is a highly active, predatory shoaling fish infamous for its scale-eating (lepidophagous) behavior. They are extremely aggressive and will strip the scales, fins, and even eyes off almost any tankmate. They must be kept in a species-only tank in large groups (12+) to disperse their intense conspecific aggression; otherwise, they will systematically kill each other.
Blue Emperor Tetra
Inpaichthys kerri
The Blue Emperor Tetra, also known as the Royal Tetra, is a stunning, active schooling fish native to the Aripuanã River basin in Brazil. They feature a bold dark lateral stripe and vibrant blue-purple iridescence that intensifies in planted aquariums with slightly acidic water. Males will actively spar and display to establish dominance, but are harmless to other species.
Fire Tetra
Hyphessobrycon flammeus
The Fire Tetra (commonly sold as the Flame or Von Rio Tetra) is a peaceful, schooling nano fish originating from the coastal rivers of Brazil. They are prized for their striking two-toned appearance, which transitions from silver/yellow at the head to a vibrant fiery red at the tail. Hardy and adaptable, they make an excellent choice for planted community aquariums, though they are unfortunately considered endangered or possibly extinct in the wild due to habitat loss.