Arowana

Overview

Arowanas are often called "dragon fish" due to their elongated bodies, large metallic scales, and barbels resembling dragon whiskers. These ancient fish are living fossils that have remained largely unchanged for millions of years, making them fascinating additions to large aquariums.

In Asian cultures, particularly Chinese, Arowanas are considered symbols of luck, prosperity, and strength. The most prized Asian Arowanas can command prices of tens of thousands of dollars, with some exceptional specimens selling for over $300,000. South American Silver Arowanas are more accessible to hobbyists.

Understanding the full scope of Arowana care requires appreciating the biological and behavioral complexity of this species. As a 24-36 inches (60-90 cm), some larger aquatic animal with a typical lifespan of 15-20+ years, the Arowana has evolved specific physiological adaptations that directly influence how they should be kept in captivity. Their natural habitat—characterized by specific water chemistry, flow patterns, and ecological relationships—provides the blueprint for successful aquarium husbandry. Experienced aquarists consistently note that Arowana thrive when keepers replicate these natural conditions as closely as possible, rather than simply meeting minimum survival parameters.

The Arowana's behavioral repertoire extends well beyond what casual observers might expect. These fish exhibit complex social hierarchies, territorial behaviors, and feeding strategies that become increasingly apparent in well-maintained aquarium environments. Their predatory, semi-aggressive disposition means that tank mate selection requires careful consideration—not all community fish are compatible, and individual personality variation means that even within the same species, behavioral differences can be significant. Keepers who invest time in observing their Arowana's natural behaviors are better equipped to identify stress indicators, illness onset, and social conflict before these issues escalate into serious problems.

From a water chemistry perspective, maintaining an aquarium for Arowana demands consistent attention to parameters including temperature (75-82°F (24-28°C)), pH (6.0-7.5), and tank capacity (minimum 30 gallons). These parameters are not merely guidelines—they represent the range within which Arowana's metabolic processes, immune function, and reproductive behaviors operate optimally. Deviations outside these ranges, even temporary ones, can trigger stress responses that compromise immune function and increase susceptibility to common aquatic diseases. Successful Arowana keeping therefore requires not just the right equipment, but a disciplined approach to monitoring and maintaining water quality over the long term.

Natural Habitat

Arowanas inhabit various freshwater environments: Your aquatic veterinarian and experienced Arowana owners can offer perspective tailored to your situation.

• South American: Amazon basin floodplains, slow-moving rivers, and flooded forests
• Asian: Blackwater streams, peat swamps, and slow-moving rivers in Southeast Asia
• Australian: Rivers and billabongs of northern Australia and New Guinea
• Surface Dwellers: Spend most time near the surface, leaping for prey

Arowana Varieties

Several species are kept in aquariums: Your aquatic veterinarian and experienced Arowana owners can offer perspective tailored to your situation.

• Silver Arowana (Osteoglossum bicirrhosum): Most common; South American origin; grows to 3+ feet
• Black Arowana (Osteoglossum ferreirai): Juveniles are black; adults silver; South American
• Asian Arowana (Scleropages formosus): Most prestigious; includes Red, Gold, and Green varieties; CITES protected
• Jardini Arowana (Scleropages jardini): Australian; more aggressive; beautiful spotted pattern
• African Arowana (Heterotis niloticus): Less colorful; filter-feeding species

Tank Requirements

Arowanas require massive, specialized aquariums.

• Tank Size: Minimum 250 gallons; 300+ gallons preferred for adults
• Dimensions: Tank must be at least 3x fish length long, 2x wide
• Lid: Heavy, secure lid is ESSENTIAL; Arowanas are powerful jumpers
• Filtration: Massive filtration; sump systems recommended
• Decorations: Minimal; open swimming space is crucial
• Lighting: Moderate; excessive light can stress them

Water Parameters

Water quality is critical for Arowana health.

Diet & Feeding

Arowanas are surface-feeding carnivores.

• Staple Foods: Carnivore pellets (once trained to accept them)
• Live Foods: Crickets, mealworms, grasshoppers, shrimp
• Frozen Foods: Market shrimp, silversides, smelt
• Occasional: Small feeder fish (quarantine first to prevent disease)
• Avoid: Fatty foods, goldfish feeders (thiaminase content)

Feeding Schedule: Juveniles 2-3 times daily; adults once daily or every other day. Overfeeding causes "drop eye" and obesity.

Proper nutrition for Arowana requires understanding not just what to feed, but how feeding strategies affect health, behavior, and water quality. In the enclosed ecosystem of an aquarium, every uneaten food particle and every waste product contributes to the biological load that your filtration system must process. Overfeeding—the most common nutritional mistake in fishkeeping—degrades water quality, promotes algae growth, and can directly cause health problems including fatty liver disease and swim bladder disorders. A disciplined approach to feeding, where your Arowana receives the right amount of appropriate food at consistent intervals, is one of the most impactful things you can do for both the fish and the overall aquarium ecosystem.

Diet variety is essential for optimal Arowana health because no single commercial food provides the complete nutritional profile these fish require. A rotation that includes high-quality prepared foods (pellets or flakes formulated for the species), supplemented with frozen or freeze-dried options and occasional live foods, provides the nutritional diversity that supports immune function, coloration, and natural behavior expression. Each food type offers different nutritional benefits—prepared foods provide balanced baseline nutrition, frozen foods offer natural protein sources, and live foods trigger natural hunting behaviors that provide valuable mental stimulation. Observing your Arowana's response to different food types also provides useful health information, as reduced interest in normally preferred foods is often an early indicator of illness.

Behavior & Social Structure

Arowanas display distinctive behaviors.

• Surface Dwellers: Patrol near the surface constantly
• Jumpers: Can leap 6+ feet out of water; secure lids mandatory
• Intelligent: Recognize owners and can be hand-fed
• Territorial: Aggressive toward conspecifics and similar-looking fish
• Predatory: Will eat any fish that fits in their mouth

The behavioral complexity of Arowana is often underestimated by those new to the aquarium hobby. While aquarium fish are sometimes perceived as passive decorative elements, Arowana display a rich repertoire of social behaviors, territorial strategies, and environmental interactions that become increasingly fascinating to observe over time. Their predatory, semi-aggressive disposition provides a general framework for predicting behavior, but individual variation is significant—experienced keepers learn to read the subtle body language cues, color changes, and swimming patterns that indicate mood, stress level, and social status within the tank hierarchy.

In community aquarium settings, understanding Arowana's behavioral tendencies becomes critical for preventing conflict and promoting natural behavior expression. Tank mate selection should be guided not just by compatibility charts but by an understanding of how Arowana establish and defend territory, compete for food, and interact with conspecifics. Factors such as tank layout, sight lines, feeding distribution, and the presence of refuge areas all influence behavioral dynamics. A well-designed aquascape that provides appropriate territorial boundaries and retreat options can transform a potentially aggressive Arowana interaction into a stable, watchable social dynamic. Conversely, a poorly planned tank can escalate minor territorial disputes into chronic stress for all inhabitants.

Feeding behavior in Arowana reveals much about their ecological role and can be leveraged by keepers to promote natural behaviors and reduce aggression. Observing when, where, and how your Arowana feeds provides diagnostic information about their comfort level, health status, and social standing. Changes in feeding behavior—such as reduced enthusiasm, feeding only when other fish are not present, or aggressive food guarding—often signal underlying issues that should be investigated. Many successful Arowana keepers use varied feeding strategies including target feeding, scatter feeding, and enrichment feeders to promote natural foraging behaviors and reduce competition-related stress.

Compatibility

Tank mate selection is limited: Understanding how this applies specifically to Arowana helps you avoid common pitfalls.

Potentially Compatible Tank Mates

• Large peaceful or semi-aggressive fish (adult Oscar, large Pleco)
• Bottom-dwelling fish (Bichirs, large catfish)
• Fast-swimming fish too large to eat (large Silver Dollars)

Incompatible Species

• Any fish that fits in the Arowana's mouth
• Other Arowanas (unless tank is enormous)
• Aggressive surface dwellers
• Slow-moving fish that can be ambushed

Common Health Issues

Arowanas are prone to specific conditions: Your aquatic veterinarian and experienced Arowana owners can offer perspective tailored to your situation.

• Drop Eye: Eyes droop downward; causes debated; may be irreversible
• Gill Curl: Gill covers curl outward; often from poor water quality
• Ich: Common parasite; treat with increased temperature and medication
• Fin Rot: Bacterial infection from poor conditions
• Anchor Worms: External parasites; require manual removal
• Jump Injuries: Broken jaw or spinal damage from hitting lids

Keeping an Arowana healthy means prioritizing water quality above everything else. Most health problems in aquatic species trace back to suboptimal water parameters, and by the time visible symptoms appear, the problem is often well advanced. Consistent water testing and maintenance isn't just helpful — it's the single most effective health strategy you have.

Recognizing early signs of disease in Arowana requires a trained eye and consistent observation. Behavioral changes such as reduced feeding, isolation from tank mates, clamped fins, flashing (rubbing against surfaces), or abnormal swimming patterns often precede visible physical symptoms by days or even weeks. Establishing a daily observation routine—even just a few minutes of focused attention during feeding—helps you develop a baseline understanding of what normal behavior looks like for your specific Arowana, making deviations immediately apparent. Many experienced aquarists keep a brief log of observations, particularly after water changes, feeding changes, or the introduction of new tank mates.

Quarantine protocols represent one of the most impactful health management practices available to Arowana keepers. Every new addition to the tank—whether fish, invertebrate, or live plant—has the potential to introduce pathogens, parasites, or chemical contaminants. A dedicated quarantine tank (even a small, simple setup) allows you to observe new arrivals for signs of illness over a two to four week period before introducing them to your main display. This single practice prevents the majority of disease outbreaks in established aquariums and is considered essential by virtually all experienced Arowana keepers. The modest investment in quarantine equipment pays for itself many times over by protecting the health of your existing collection.

Arowanas Are Great For:

• Experienced aquarists ready for a commitment
• Those with space for 250+ gallon tanks
• Hobbyists wanting an impressive centerpiece fish
• Keepers who appreciate prehistoric species

Arowanas May Not Be Ideal For:

• Beginners to fishkeeping
• Those with limited space or budget
• Community tank enthusiasts
• Anyone unable to commit to 15+ years of care

The best way to decide if an Arowana is right for your tank is to talk to people who already keep them. Online forums and local aquarium clubs are full of keepers who will give you honest, experience-based advice about what works and what does not. That kind of practical insight is more valuable than any care sheet.

If the research checks out and your setup is suitable, go for it. A well-maintained Arowana is one of the more satisfying species to keep, and most owners who take the time to get it right have no regrets.

Cost of Ownership

Arowana consistent chemistry, controlled feeding, and deliberate quarantine sit at the centre of sustained aquatic welfare; these factors drive outcomes more than brand-name products.

The true cost of keeping Arowana extends well beyond the initial purchase price and basic equipment. While the upfront investment in a properly equipped aquarium (minimum 30 gallons) represents a significant portion of the total cost, ongoing expenses for water treatment chemicals, filter media, electricity for heating and lighting, and food constitute the majority of long-term spending. Many aspiring Arowana keepers underestimate these ongoing costs, which can lead to cut corners that ultimately compromise fish health and result in even greater expenses. A realistic budget that accounts for both routine maintenance and occasional replacement of equipment provides a more accurate picture of what Arowana keeping actually costs.

Equipment failure is an inevitable aspect of aquarium keeping that should be factored into financial planning. Heaters, filters, lights, and pumps all have finite lifespans, and their failure—particularly heater or filter failure—can have catastrophic consequences for Arowana if not addressed promptly. Maintaining a small emergency fund specifically for aquarium equipment replacement, or keeping backup equipment on hand for critical systems like heating and filtration, is a wise investment. Many experienced Arowana keepers also invest in battery-operated air pumps and backup heaters as insurance against power outages, which can be lethal to tropical species within hours depending on ambient room temperature.

The cost-benefit analysis of quality versus budget equipment deserves careful consideration for Arowana keepers. Higher-quality filters, heaters with accurate thermostats, and reliable lighting systems cost more upfront but typically last longer, perform more consistently, and are less likely to fail catastrophically. In aquarium keeping, equipment failure can result in livestock losses worth far more than the savings from choosing budget equipment. This is particularly true for Arowana, where the animals themselves, along with any tank mates, plants, and established biological filtration, represent a significant investment of both money and time that is worth protecting with reliable equipment.

Related Species

If you're interested in Arowanas, you might also consider.

• Peacock Bass - Large, impressive predator
• Flowerhorn - Colorful, interactive fish
• Pacu - Large, peaceful South American species
• African Cichlid - Colorful alternative for smaller tanks