Dragon Fish (Silver Arowana) - Osteoglossum bicirrhosum | UK

The Silver Arowana, often searched as a Dragon Fish, is one of the most dramatic fish that can be kept in a freshwater aquarium. With its long metallic body, upturned mouth, and smooth surface-gliding movement, Osteoglossum bicirrhosum looks like a fish that was designed from myth rather than nature. This South American giant is famous as a fish that looks like a dragon, and it has become a true icon among keepers of predatory fish UK displays and oversized show tanks. In the right dragon fish aquarium, this species can exceed 60 cm and, in exceptional cases, approach 100 cm, so understanding arowana tank requirements, silver arowana tank size, and long-term care is essential before purchase. It is a semi-aggressive top-dwelling carnivore with a potential silver arowana lifespan of 10-20 years, making it a serious commitment rather than an impulse buy.

In this guide, you will learn the real silver arowana requirements, including silver arowana tank setup, silver arowana water parameters, feeding, tank mates, health, and why this is often considered the best arowana for large tank displays rather than the best arowana for a small home setup. See our detailed photos showing the sleek body shape and reflective scales in the product image dragon-fish.webp, ideal if you are comparing dragon fish pictures, researching dragon fish pet care, or deciding whether this stunning silver predatory fish belongs in your collection. For aquarists with the space, planning, and filtration to match its needs, the Silver Arowana becomes an unforgettable centrepiece fish.

Where Do Silver Arowana Come From? Natural Habitat Explained

The natural silver arowana habitat is tropical South America, especially the Amazon basin and connected systems such as the Rupununi and Oyapock rivers. The Osteoglossum bicirrhosum habitat includes slow-moving rivers, floodplains, forest lagoons, and seasonally inundated areas where the fish patrols the surface for insects, small fish, crustaceans, and anything else that lands in reach. If you are asking where do dragon fish live or where do dragonfish live, the answer is warm, soft, often tea-stained freshwater rich in cover overhead and food at the surface.

Unlike many small river fish species, the Silver Arowana is built for distance, speed, and ambush. Its large pectoral fins and long body let it cruise just under the surface, while its famous upward-facing mouth helps it snatch prey from above. In the wild, this is one reason people ask what do silver arowana eat in the wild—they eat insects, smaller fish, frogs, and occasionally animals that fall from branches. This natural hunting style explains why a dragon fish freshwater aquarium must have open swimming room and a secure lid.

Searches such as dragon fish habitat and dragon fish where do they live often mix up arowanas with deep-sea species like stomiidae, the family that includes true marine dragonfish. That is an important distinction: the Silver Arowana is not related to the black deep-sea forms often called black dragon fish or black dragonfish, and it certainly does not come from the angler fish mariana trench or barreleye mariana trench environment. It is a surface predator from warm tropical rivers, not a deep-ocean fish.

In nature, seasonal flooding shapes behaviour, feeding, and growth. Juveniles often use shallower margins for safety, while adults range through much larger areas. This is why a juvenile may look manageable in a shop tank but rapidly outgrow average home aquariums. Good husbandry starts by respecting the species as a roaming river predator, not just a decorative oddity.

How to Set Up the Perfect Tank for Silver Arowana

Getting the tank right is the single most important part of successful long-term care. Many problems blamed on temperament or disease are actually caused by poor planning around silver arowana tank size, filtration, or lid security. If you are researching what size tank for silver arowana, the honest answer is: much larger than most hobbyists expect.

Tank Size Requirements

The practical silver arowana minimum tank size is 950 litres, but that is only a starting point for a juvenile or subadult. A far better long-term target is 1900 litres or more, especially for a fish expected to reach 75-90 cm. A useful way to think about silver arowana tank size in feet is that length and width matter as much as volume. A narrow tank may hold enough litres on paper but still restrict turning and cruising. For many keepers, the best footprint is at least 8 x 3 ft, with larger systems strongly preferred.

If you have searched for a silver arowana tank size chart, use one with caution. Charts can oversimplify a fish whose body shape, jumping ability, and growth rate demand generous dimensions. People also ask how big do silver arowana get in aquarium; in a well-run system, 60 cm is common, and larger specimens are possible. A 2ft silver arowana is not unusual with good care, which is why a small tank is never a temporary solution for long.

Water Parameters

Stable water matters more than chasing an exact number. The ideal silver arowana temperature is around 26°C, with a safe silver arowana temperature range of 24-28°C. Keep pH between 6.5 and 7.5 and maintain soft to moderately soft water. For those looking up Osteoglossum bicirrhosum water hardness, aim for 1-10 dGH. These silver arowana water parameters support appetite, immune function, and smooth growth.

Many buyers ask does silver arowana need heater. In UK homes, yes, absolutely. A large reliable heater or multiple heaters on a controller are strongly recommended to keep the silver arowana water temperature stable. Sudden drops can trigger stress, refusal to feed, and opportunistic infection.

Filtration

Arowanas are messy carnivores, so filtration must be oversized. Use a high-capacity sump or multiple external canisters rated well above the tank volume. Aim for strong biological filtration with moderate turnover and excellent oxygenation, but avoid chaotic surface turbulence that causes constant stress. Large mechanical stages help capture food waste before it breaks down.

For a serious silver arowana tank setup, pair your fish with robust life-support equipment and generous maintenance. Weekly partial water changes of 30-50% are common in heavily fed systems. When setting up a dragon fish in aquarium display, think like a public aquarium keeper: redundancy, stability, and easy maintenance access.

Substrate, Decor, Plants, and Lid

Substrate is mostly aesthetic because this species stays near the surface. Smooth sand or fine rounded gravel works well and reflects light softly upward. Keep decor low, secure, and blunt-edged. Large driftwood pieces can look impressive but must not create launch points near the lid.

Planting is optional. Tough rooted plants around the edges are safer than dense floating cover. If you like unusual surface fish, the Freshwater Butterflyfish shows how important calm upper water can be, though it is not a tank mate for adult arowanas. For aquarists building a themed oddball display, species such as Blyth’s Archerfish, Elephant Nose Knifefish, and Elephantnose Fish can offer inspiration for different zones of the aquarium, even if not all are direct companions.

The lid is non-negotiable. Arowanas are legendary jumpers. A small gap for pipes is enough for disaster. The safest dragon fish for aquarium setup uses a heavy, tight-fitting cover with all openings blocked.

What Do Silver Arowana Eat? Complete Feeding Guide

The Silver Arowana is a carnivore, and one of the most common questions is what do dragon fish eat. In captivity, the best dragon fish diet is varied, protein-rich, and controlled. If you are asking what dragonfish eat, dragon fish what do they eat, or what do silver arowana eat, think in terms of quality floating carnivore pellets, strips of fish or prawn, insects, and occasional frozen foods rather than random live feeders.

Staple Foods

The foundation of a good silver arowana diet should be high-quality floating predator pellets. These help train the fish to feed from the surface safely and provide balanced vitamins and minerals. This is especially important for juveniles, where consistent nutrition supports the silver arowana growth rate without encouraging fatty degeneration.

Supplemental Foods

Supplement pellets with prawns, mussel, white fish, earthworms, crickets, and other clean invertebrate foods. This keeps silver arowana feeding varied and more closely reflects what they would take in the wild. For young fish, people often ask what to feed baby silver arowana; smaller pellets, chopped prawn, bloodworm, and soft insects are useful until the fish can take larger items confidently.

Treats and Foods to Avoid

Occasional treats such as mealworms or locusts can stimulate natural hunting behaviour, but avoid making fatty insects the main diet. Also avoid feeder fish from unreliable sources, as they introduce parasites and thiaminase issues. If you are wondering what to feed silver arowana for best long-term condition, variety beats novelty. Despite odd online searches like dragon fish dish, this species should be managed as a specialist aquarium predator, not treated casually.

Some keyword searches such as angler fish diet, what anglerfish eat, what do angler fish eat, and what does angler fish eat refer to a completely different marine fish. Those feeding answers do not apply here. Likewise, what do angler fish eat ark is a gaming query, not a care guide. For a Silver Arowana, the focus should stay on clean carnivore foods presented at the surface.

Feeding Frequency

Juveniles do best with 2 small meals daily. Subadults can be fed once or twice daily, while large adults often thrive on one substantial meal a day or 5-6 meals per week. If you are asking why is my silver arowana not eating, common causes include low temperature, stress after transport, poor water quality, or a fish that has become fixated on one food type. Most healthy specimens can go a short period without issue; people asking how long can silver arowana live without food should know that adults may endure days to a couple of weeks, but fasting should never replace proper troubleshooting.

Time	Food	Amount
Morning	Floating carnivore pellets	Only what is eaten in 1-2 minutes
Evening	Prawn, insect mix, or white fish strips	1 modest portion, no leftovers

Silver Arowana Appearance: Colors, Patterns & Varieties

The Silver Arowana is a long, laterally compressed fish with a pointed head, large reflective scales, and two barbels projecting from the lower jaw. These barbels are one reason some hobbyists search for a barbel freshwater fish uk display species. Adults are elegant rather than bulky, with elongated dorsal and anal fins that run far back toward the tail, creating a ribbon-like swimming motion.

Juveniles often show a stronger blue-silver sheen, and some buyers asking what are blue dragon fish may actually be seeing young arowanas under cool lighting. Mature fish are usually silver with subtle darker edging and occasional hints of pink, blue, or bronze depending on diet, lighting, and mood. The fins may show warm tones, which is why some people describe them as freshwater fish with red fins in certain photographs.

If you are comparing this species with deep-sea dragonfish, remember that the Silver Arowana is not the same as a black dragon fish or black dragonfish. Those names usually refer to unrelated marine species. The arowana is a bright, surface-dwelling river fish and one of the most recognisable large predatory fish UK hobbyists keep indoors.

Osteoglossum bicirrhosum size in captivity commonly reaches 60-90 cm, and the fish looks even larger because of its length and posture. Sexual dimorphism is subtle. Mature males may appear slightly slimmer and are the sex responsible for mouthbrooding during successful silver arowana breeding, but visual sexing is unreliable. Our photos show the clean metallic scaling and graceful profile that make this a standout impressive display fish UK aquarists often choose for oversized installations.

What Fish Can Live With Silver Arowana? Compatibility Guide

A common question is are dragon fish aggressive or are silver arowana aggressive. The best answer is that they are predatory, territorial at feeding time, and semi-aggressive rather than constantly violent. A healthy adult will eat any fish small enough to fit in its mouth, and it may bully surface competitors. So while a silver arowana community tank is possible, it is never a standard community in the usual sense.

Ideal Tank Mates

The best silver arowana tank mates are large, robust species that occupy different levels and can handle warm, clean water. Good options include large plecos, big catfish, bichirs, and some oscars in very spacious systems. If you are researching Osteoglossum bicirrhosum tank mates, focus on body size, temperament, and swimming zone rather than just species names.

Suitable oddball companions may include large bichirs, which is why some keepers search dragon fish bichir combinations. In huge aquariums, oscars can work, leading to the frequent question can silver arowana live with oscars. The answer is yes, sometimes, but only in oversized tanks with carefully matched individuals. Similarly, can silver arowana live with cichlids depends on the cichlid. Large but not hyper-aggressive species are safer than combative Central Americans or African cichlids.

Species to Avoid

Small fish are food. Delicate fish are stressed by the arowana’s speed and feeding response. Goldfish are poor companions because of temperature mismatch, body shape, and disease risk, so can silver arowana live with goldfish is effectively a no. Koi are pond fish and not suitable indoor tank mates, so can silver arowana live with koi is also not recommended. Searches such as silver arowana with african cichlids usually end badly because many African species are too aggressive, too territorial, or need different chemistry.

People also ask can silver arowana live together, how many silver arowana can live together, or even 2 silver arowana in 1 tank. In most home aquariums, keeping multiple Silver Arowanas together is risky. Juveniles may shoal loosely, but as they mature, competition and injury become much more likely. Unless the tank is enormous and the fish are carefully managed, a single specimen is the safer choice.

Species	Compatible?	Notes
Australian Bonytongue	⚠️ Caution	Similar prestige fish; only for very large specialist systems.
Elephant Nose Knifefish	⚠️ Caution	Different level use, but only with careful size matching and peaceful conditions.
Elephantnose Fish	⚠️ Caution	Can work only when the arowana is not large enough to view it as prey.
Blyth’s Archerfish	❌ Avoid	Surface zone conflict and different long-term setup priorities.
Freshwater Butterflyfish	❌ Avoid	Too small and occupies the same upper level.
Small tetras, rasboras, livebearers	❌ Avoid	Will be eaten.

Odd searches like are angler fish aggressive, is angler fish aggressive, or do angler fish fuse together refer to unrelated marine species and should not guide your stocking plan. For Silver Arowanas, the main compatibility rule is simple: no small prey, no relentless fin-biters, and no cramped tanks.

How to Breed Silver Arowana: Complete Breeding Guide

Silver arowana breeding in captivity is exceptionally rare and, for most hobbyists, effectively impossible. This species needs immense space, mature adults, stable conditions, and often pond-scale facilities. If you are searching silver arowana breeding age, sexual maturity usually comes only after several years, often when the fish are already very large.

Breeding Setup

Successful attempts require huge systems with warm soft water, excellent nutrition, and minimal disturbance. A standard indoor aquarium is rarely enough. The fish must be conditioned on a rich, varied carnivore diet and given room for courtship behaviour. This is not a species where a small dedicated breeding tank solves the problem.

Spawning Behaviour

In the wild, pairs spawn and the male takes the eggs into his mouth. If you are asking what day dragon fish spawn, there is no simple aquarium calendar answer. Spawning is linked to maturity, condition, environmental stability, and likely seasonal cues that are hard to reproduce indoors. During true silver arowana breeding, the male becomes the mouthbrooder and may stop feeding while carrying eggs or fry.

Egg Care and Fry

Because the male incubates the brood, there is no separate egg tumbler stage like with some other species. Once released, fry are large compared with many tropical fish and need immaculate water plus appropriately sized meaty foods. Questions like angler fish eggs, angler fish baby, or angler fish with baby teeth are unrelated and should not be used as care references for arowanas.

Sexing and Challenges

Visual sexing is difficult, so terms such as angler fish female, angler fish male, angler fish female vs male, angler fish male vs female, anglerfish male and female, anglerfish with male, anglerfish with male attached, and are male anglerfish small do not apply here. In Silver Arowanas, external sex differences are subtle, and pairing compatible adults is one of the biggest barriers.

Silver Arowana vs Similar Species: Which Should You Choose?

Choosing between large prestige fish matters because the wrong species can outgrow your tank, clash with your stocking plan, or demand a very different budget. If you are comparing arowana types, the Silver Arowana is usually the most accessible giant arowana for hobbyists who want the classic dragon-like shape without stepping into the rarity and cost of Asian varieties such as platinum arowana or niche forms like nami green arowana.

Feature	Silver Arowana	Australian Bonytongue
Max Size	60-100 cm	Up to about 90 cm
Care Level	Advanced	Advanced
Temperature	24-28°C	24-30°C
Temperament	Semi-aggressive, surface predator	Assertive, powerful feeder
Price	Varies by size and availability	Varies by size and availability
Best For	Open-top-level display fish	Collectors of ancient oddball species

Feature	Silver Arowana	Freshwater Butterflyfish
Max Size	60-100 cm	10-13 cm
Care Level	Advanced	Moderate
Tank Type	Monster tank	Specialist surface community
Best For	Silver arowana for monster tank setups	Smaller oddball aquariums
Jump Risk	Very high	High
Who Should Choose It?	Keepers with very large systems	Keepers wanting a manageable surface predator

If you want the best arowana for home aquarium in the sense of manageability, the Silver Arowana is usually not it unless your home aquarium is truly enormous. But if you want the which dragon fish is best answer for visual impact in a giant freshwater display, this species is a strong contender. It is often the best arowana for large tank owners who want constant movement, surface interaction, and unmistakable presence.

Compared with many other freshwater fish uk favourites, the Silver Arowana demands more planning but rewards that effort with scale, personality, and drama. It is the right choice for keepers building a statement tank rather than a mixed community.

Common Health Problems in Silver Arowana & How to Prevent Them

Healthy Silver Arowanas are alert, level in the water, eager to feed, and free from cloudy eyes, fin splits, or skin ulcers. Their barbels should be intact, the scales smooth, and the fish should cruise the surface without crashing into the lid. Because this species is large and reactive, many health issues begin with stress or impact injuries rather than classic small-fish diseases.

Common Problems

One of the most discussed conditions is silver arowana drop eye treatment. Drop eye is a downward displacement of one or both eyes, often associated with genetics, diet, injury, reflection patterns, or constant downward focus. Prevention is more reliable than cure: use a broad tank footprint, avoid overuse of sinking foods, and reduce visual distractions below the fish.

Other silver arowana disease concerns include bacterial infections after jumping injuries, parasitic irritation, fin damage, and stress-related refusal to feed. Poor water quality can quickly lead to cloudy eyes, red streaking, or skin inflammation. In heavily stocked systems, monitor nitrate closely and never assume a big tank stays stable without testing.

Treatment and Prevention

The first treatment step is always water quality correction. Large water changes, increased aeration, and isolation from aggressive tank mates solve many early problems. Quarantine all new fish and avoid feeding risky live prey. If medication is needed, choose products suitable for scaleless-sensitive or oddball fish where relevant, and dose carefully by true water volume.

Some online searches such as which angler fish is the biggest, which anglerfish has the light, which fish eat angler fish, or do anglerfish go to the surface when they die are unrelated marine topics. Likewise, dragon fish poison is not relevant to Silver Arowanas; they are not venomous. The real risks are injury, poor water, and long-term nutritional imbalance.

Understanding Silver Arowana Behavior in the Aquarium

The Silver Arowana is an active, intelligent surface hunter. It spends much of the day patrolling the top of the tank, watching movement outside the glass, and reacting quickly to feeding cues. This is one reason it is so popular as a dragon fish in aquarium centrepiece. Few freshwater species interact with the room as obviously as an arowana does.

Its semi-aggressive reputation comes from predation and space use rather than constant territorial attack. A solitary specimen is often the easiest route to success. In a properly planned silver arowana for species tank, you can see more relaxed cruising, cleaner turns, and stronger feeding confidence than in a crowded mixed setup.

Colour and posture change with mood. A stressed fish may clamp fins, pace the glass, or strike the lid. A settled fish glides smoothly and takes food decisively. If you want reliable dragonfish facts, one of the best is this: behaviour is your earliest health indicator. Watch the fish every day, especially after maintenance or changes in diet.

Because this species is top-oriented, it can be startled by shadows and sudden movement. Calm lighting transitions and a consistent routine help. In the right tank, the Silver Arowana becomes a responsive, memorable display animal rather than a nervous giant.

Why Buy from Tropical Fish Co?

Large predatory fish are not all equal at the point of sale. A Silver Arowana should arrive with straight body carriage, intact barbels, clean eyes, and a strong surface-feeding response. That matters far more than vague claims about quality. For buyers looking for freshwater fish uk for sale, buy dragon fish UK, or a trustworthy source for a dragon fish for sale listing, the difference is in preparation and handling.

Our Silver Arowanas are selected for alert behaviour, clean finnage, and stable feeding before dispatch. Each fish is observed during quarantine, acclimated to captive foods, and checked for transport readiness so that your new dragon fish pet is not arriving straight from a stressful import chain into your display tank. This is especially important for a species with such specific arowana tank requirements and such a long potential lifespan.

For UK delivery, fish are packed in insulated boxes with appropriate bagging volume, oxygen, and seasonal heat protection when required. Tracked delivery reduces unnecessary delays, and careful packing helps protect this long-bodied species during transit. Buyers comparing dragon fish online, dragon fish for sale near me, or even broad searches like angler fish for sale uk often discover that specialist handling matters more than the lowest headline dragon fish pet price.

If you are trying to judge dragon fish for aquarium price or comparing the dragon fish price with other oddballs, remember to budget for the full setup, not just the fish. A Silver Arowana is a long-term investment in space, filtration, heating, and maintenance. We support that purchase with practical care guidance, acclimation advice, and species-specific notes so you can build the right system from day one.

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If you are planning a serious oddball or monster setup, consider related species and display fish that suit specialist collections. The Australian Bonytongue is a natural comparison for keepers interested in ancient bonytongues. The Elephant Nose Knifefish and Elephantnose Fish add unusual behaviour to large peaceful oddball tanks. For surface-fish enthusiasts with smaller aquariums, the Freshwater Butterflyfish offers a more manageable alternative. You can also browse our wider freshwater fish UK collection for other specialist species such as Four-Spotted Copeina - Pyrrhulina Spilota -, Protomyzon pachychilus, and X Rhombo Barb for very different biotope ideas.