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Learn about silver arowana care, behaviour, tank size, diet, and key facts. A complete guide to understanding and keeping arowana fish.
Silver arowana are among the most recognisable freshwater fish in the world, known for their long, streamlined bodies, metallic silver scales, and surface-dwelling behaviour.
Often referred to simply as arowana (sometimes misspelt as arowana or arowana), they are admired for their graceful movement and commanding presence in large aquariums.
Unlike small community fish, silver arowana are powerful, intelligent swimmers that patrol the upper levels of the tank with slow, deliberate motion.
Their size and predatory instincts place them in a completely different care category from typical aquarium species.
Hardy silver arowana require careful planning, ample space, and stable water conditions to thrive long-term. When these needs are met, they display confident behaviour and consistent health.
This silver arowana care and facts guide covers behaviour, tank size, diet, compatibility, and key facts to help you understand what makes arowana such a distinctive and demanding freshwater fish.
Arowana are not a single fish type but a group of large, ancient freshwater species found across different regions of the world.
While they share a similar body shape and surface-feeding behaviour, each type differs in size, availability, and care expectations.
Below are the main types of arowana, explained clearly to avoid confusion.
The silver arowana is the most commonly kept and widely recognised type.
This is the species most people refer to when searching for arowana / aroana / arowna, and it is the focus of most general arowana care guides.
The black arowana is closely related to the silver arowana but is less common.
They are often mistaken for silver arowana, especially when young.
The Asian arowana is a distinct species group and is highly regulated.
Asian arowana care, legality, and behaviour differ significantly from those of silver arowanas and should not be confused with them.
Australian arowana are less commonly seen but are distinct in appearance.
They are kept less frequently due to limited availability.
Understanding these differences helps set accurate expectations and ensures the proper care approach for each type.
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Tank setup, including size, length, surface area, filtration, and secure covers, is the most critical factor in keeping a silver arowana healthy.
As fast, surface-oriented swimmers, they require long tanks with wide surface space; depth alone is not sufficient.
Silver arowana grow quickly and require length and surface area, not just water volume.
Short tanks restrict movement and often lead to jaw injuries, spinal stress, and abnormal swimming behaviour.
Silver arowana patrol the surface layer of the water.
Surface access matters more than vertical depth for this species.
Silver arowana are hardy but highly sensitive to sudden changes.
Stable conditions are far more critical than chasing exact numbers.
Arowana are heavy eaters and produce significant waste.
Clean water directly affects growth, appetite, and temperament.
Silver arowana are powerful jumpers and will leap when startled.
Many injuries occur when tanks are left partially open.
The amount of light in the tank also determines the arowana's behaviour. Specific factors to keep in mind include:
Lighting should support visibility without overstimulation.
Décor should never interfere with movement.
Clear swimming paths prevent collisions and scale damage.
Also Read: 10 Most Dangerous Fish in the World
Diet plays a significant role in the growth, behaviour, and overall health of silver arowana.
As surface-dwelling predators, they are adapted to spot and strike food from above, which means both food type and feeding method matter.
An imbalanced or inappropriate diet often leads to poor growth, digestive issues, and increased aggression.
In the wild, silver arowana are opportunistic carnivores that hunt near the water's surface. Their upturned mouths and strong jaws are designed for snapping prey that falls or moves across the surface.
They naturally feed on:
This diet explains why silver arowana respond best to protein-rich foods offered at or near the surface.
In captivity, silver arowana adapt well to prepared foods, but variety is essential. Relying on a single food type often causes nutritional gaps or feeding refusal over time.
Recommended foods include:
Pellet-trained arowana are easier to manage long-term and experience fewer digestive problems.
Feeding needs change as silver arowana grow.
Overfeeding contributes to fatty buildup, poor water conditions, and reduced activity.
Silver arowana prefer food that:
Dropping food directly onto open surfaces encourages natural hunting behaviour and reduces stress.
Some foods can cause long-term issues and should be avoided or limited.
Avoid:
A controlled, varied diet supports better health and behaviour.
A well-fed silver arowana is calmer, more confident, and less aggressive. Inconsistent feeding or protein-heavy diets without balance often result in:
Consistent feeding routines help regulate activity and reduce stress.
Silver arowana display behaviour that reflects their role as surface-dwelling predators. Calm, deliberate, and highly aware of their surroundings, they move with confidence rather than constant motion.
Understanding their behaviour is essential, as many common issues arise when their instincts are misunderstood or restricted.
Silver arowana spend most of their time near the top layer of the tank, slowly patrolling their territory. They are alert fish that react quickly to movement, shadows, and changes in their environment.
This awareness is everyday and should not be mistaken for nervousness.
Silver arowana are often described as intelligent because they:
Over time, they become predictable rather than erratic when kept under stable conditions.
Silver arowana are territorial, especially as they mature, but they are not aggressive without reason.
In appropriately sized tanks, they remain composed and controlled rather than hostile.
In the wild, silver arowana are typically solitary or loosely spaced. This behaviour carries over into aquariums.
Keeping a single silver arowana is the safest and most stable option for most keepers.
Silver arowana are powerful jumpers, a natural behaviour used in the wild to catch prey.
Jumping is usually triggered by:
This is why a secure tank cover is essential at all times.
Healthy silver arowana typically show:
Behavioural problems often indicate environmental issues.
Warning signs include:
These behaviours usually point to tank size limitations, poor water quality, or environmental stress.
Misinterpreting their behaviour often leads to incorrect care decisions, while understanding it leads to long-term success.
Choosing tank mates for a silver arowana requires careful planning and realistic expectations.
While they are not aggressive by default, their size, speed, and surface dominance make them incompatible with most other species.
Most problems arise when tank mates compete for space, food, or territory. For many keepers, a single-species tank remains the safest option.
Yes, but only under specific conditions:
Even then, compatibility is never guaranteed.
The following fish are sometimes kept with silver arowana in large, well-managed tanks:
*Redtail catfish grow extremely large and require massive tanks, often unsuitable for most home aquariums.
These species work only because they are:
Many fish are incompatible due to size, speed, or behaviour.
Avoid:
Even fish that start safe can become prey as the arowana grows.
Most tank mate conflicts happen during feeding.
Target feeding and careful monitoring are essential in mixed tanks.
Silver arowana establishes a clear surface territory.
Without sufficient space, even compatible species may clash.
For most keepers:
Breeding silver arowana is rare in home aquariums and should be approached with realistic expectations. While they are not impossible to breed, their size, space requirements, and specific reproductive behaviour make successful breeding limited primarily to extensive private systems or commercial facilities.
In the wild, silver arowana breed in calm, shallow waters during favourable seasonal conditions. They form pairs temporarily rather than permanent bonds.
Key traits include:
This natural pattern explains why breeding does not occur easily in confined spaces.
Silver arowana take time to mature.
Because males and females look similar, identifying a breeding pair is a significant challenge.
Silver arowanas are male mouthbrooders, a defining characteristic of their breeding process.
This behaviour greatly increases fry survival but makes breeding stressful for the male.
Several factors make aquarium breeding difficult:
Most home setups do not provide the space required.
Once released, fry are relatively large and well-developed.
Even after release, survival depends heavily on space and water quality.
For most aquarists, breeding silver arowana is not practical.
Silver arowana are best appreciated for their growth, behaviour, and longevity rather than breeding potential.
Even if breeding is not the goal, understanding silver arowana reproduction helps explain:
Recognising these instincts leads to better long-term care and fewer behavioural issues.
Silver arowana are often described as "ancient" fish, and many of their traits reflect a long evolutionary history. These facts highlight what truly sets them apart from typical freshwater species and help explain their unique care needs.
1. Ancient lineage: Silver arowana belong to one of the oldest freshwater fish families, with ancestors dating back millions of years. Their body shape has changed very little over time.
2. Surface predators by design: Their upturned mouth and surface-focused vision are adapted for catching insects, small fish, and prey that fall onto the water from above.
3. Exceptional jumpers: In the wild, silver arowana leap out of the water to catch insects and small animals. This same instinct makes a secure tank cover essential in aquariums.
4. Rapid growth rate: Juveniles grow quickly in their first few years. Many care problems arise when owners underestimate how fast they outgrow smaller tanks.
5. Long lifespan: With proper care and space, silver arowana can live 15–20 years or more, making them a long-term commitment rather than a short-term pet.
6. Strong visual awareness: Silver arowana closely track movement outside the tank and often recognise feeding routines, which is why they appear highly alert.
7. Mouthbrooding males: During breeding, the male carries eggs and fry in his mouth for several weeks, a rare and demanding form of parental care.
8. Limited colour variation: Unlike Asian arowana, silver arowana do not have true colour morphs. Names like "blue" or "platinum" are usually marketing terms.
9. Often misnamed online: Searches for arowana, arowana, or arowana almost always refer to silver arowana rather than other species.
10. Best suited for experienced keepers: Their size, strength, and space requirements make silver arowana unsuitable for small or casual aquarium setups.
These facts help place silver arowana in the proper context: not as decorative fish, but as powerful, long-lived predators that demand space, planning, and informed care.
Also Read: 10 Most Dangerous Fish in the World
Silver arowana require planning and consistency more than constant adjustment.
The points below pair with actions to make caring for an arowana easier:
The fish itself does not cause most problems, but it is due to mismatched expectations.
Understanding both best practises and common mistakes helps keepers avoid costly errors and build a stable environment from the beginning.
1. Keeping them in undersized tanks
Silver arowana do not adapt to cramped environments. Long-term confinement leads to injury and deformity.
2. Leaving tanks uncovered or loosely covered
Many arowana losses result from jumping accidents.
3. Overfeeding or using unsuitable foods
Excess feeding pollutes water and causes health issues. Mammalian meats and excessive feeder fish should be avoided.
4. Choosing incompatible tank mates
Small, surface-dwelling, or slow fish often become prey or stress triggers.
4. Making sudden water changes
Significant or abrupt parameter shifts can cause panic and loss of appetite.
5. Crowding the tank with décor or fish
Limited turning space increases the risk of collisions and stress.
6. Underestimating long-term commitment
With lifespans of 15–20 years, silver arowana require sustained space and care planning.
Silver arowana are not decorative fish; they are large, intelligent, surface-dwelling predators that demand space, stability, and long-term planning.
When their tank size, diet, and environment are set up correctly, they display calm movement, vigorous growth, and confident behaviour that few freshwater species can match.
Understanding how silver arowana swim, feed, and react to their surroundings is essential before keeping one. Observing them in a properly designed environment provides clarity that guides alone cannot offer.
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