Orbicular Batfish
Platax orbicularis
The Dead-Leaf Giant (20 inches tall and long). The juveniles brilliantly mimic dead floating mangrove leaves. The adults look like massive silver dinner plates.
Water Temperature
24 - 27 °C
pH Value
8.1 - 8.4
Water type
Freshwater
Tank level
Middle
Adult size
50 cm
Minimum tank volume
>= 500 L
Minimum group
>= 1
GH
15 - 30 dGH
KH
7 - 15 dKH
TDS
295 - 600 ppm
Conductivity
461 - 938 uS/cm
Species description
Geographical Origin and Habitat: Indo-Pacific. Juveniles live holed up in brackish waters, mangroves and muddy ports, exploiting incredible leaf camouflage. Adults migrate to the open sea and large reef lagoons.
Taxonomy and Morphology: Orbicular Batfish (Platax orbicularis). Marine Batfish. It grows out of all proportion (50 cm / 20 inches), transforming from an almost oval "flat leaf" (juvenile form) into a majestic silver disc (orbicular).
Social Behavior: The Pet (Puppy-dog tame). Once accustomed, the Batfish is highly intelligent and peaceful; it will take food directly from the aquarist's hands, skimming the surface as soon as you approach the glass.
Coloration and Sexual Dimorphism: Excellent camouflage. The juvenile has disproportionately high dorsal and anal fins colored rusty brown/black: if threatened, it pretends to be a dead leaf carried by the current. The adult is round, shiny silver, with only a few faded bands on the eyes and sides.
Care, breeding and tankmates
Aquarium Setup: Monster Tank (at least 800-1000 Liters / 210-260 Gallons for an adult, tank taller than long). Given its "disc" size, shallow tanks will force it to scrape its fins on the rocks or bottom. There must be no narrow crevices.
Diet and Feeding: Voracious omnivore. Organic debris machine, in nature it cleans the water. In the tank it must be stuffed with minced shrimp, squid pulp, bluefish (silversides) and also vegetables (broccoli, spinach, nori algae).
Water Quality: Tolerates sub-optimal quality well (coming from mangroves), but as it grows it will produce a terrifying organic load. The filters must be "shark" class to handle the ammonia produced.
Compatibility and Cohabitation: Prey and Predator. Although not mean, it will eat any crustacean and fish small enough to fit in its mouth (Chromis, dwarf Clowns). Juveniles (with their very high fins) are instead perfect victims of bites from Angelfish and Triggerfish.
Aquarium Breeding: Absent in private systems. They reproduce only in the oceans releasing pelagic eggs in large schools; some public aquariums and Asian farms (food-fish) succeed in huge brackish ponds.
Risks and Diseases: The Unsuitable Giant. Often sold "cute" at 5 cm (2 inches) in stores, many beginners put it in 100 liters (25G). In 1 year it doubles in size 10 times. If confined in cramped tanks, its fins will rot and it will die prematurely.
Geographic Origin and Distribution
Indo-Pacific. Juveniles live holed up in brackish waters, mangroves and muddy ports, exploiting incredible leaf camouflage. Adults migrate to the open sea and large reef lagoons.
Origin
Selective breeding and cultivarsEast AsiaTropical oceans and reefs
Fish profile
- Temperament
- Semi-aggressive
- Batfish are known for their incredibly personable and intelligent temperament, often becoming 'wet pets'. They are generally peaceful towards similarly sized tankmates but can be intimidating due to their sheer bulk. They quickly learn to recognize their owners and may even accept food directly from a hand. They rarely show aggression unless competing for food.
- Diet
- Omnivore
- They are omnivorous and will enthusiastically accept a wide variety of foods in the aquarium. Their diet should consist of high-quality marine pellets, mysis shrimp, and chopped squid. It is also important to include vegetable matter, such as spirulina, to ensure balanced nutrition. They are aggressive eaters that quickly learn to take food from the surface.
- Life expectancy
- 10-12 years
- The orbicular batfish has a lifespan of about 10 to 12 years in captivity, potentially reaching 15 years under excellent conditions. Their longevity requires careful management of water quality and a large tank to prevent stunting. The stability of the biological system is essential to prevent chronic bacterial infections.
- Adult size
- 50 cm
- The catalog's scalar value is 50 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 60 cm for this species, recorded as total length (TL). The taxonomic record consulted is Platax orbicularis (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Solitary
- There is no visible sexual dimorphism, making it impossible to accurately sex them without internal examination. Due to their huge adult size, they are almost always kept singly in home aquariums. If an immensely large public-style aquarium is available, a small group can be kept together. Single specimens adapt perfectly well to solitary life.
- Feeding frequency
- Twice daily
- Juveniles require frequent feedings, roughly three times a day, to support their incredibly fast growth rate. Adults should be fed once or twice daily with appropriately sized meaty portions. Care must be taken not to overfeed, despite their constant begging behavior. Uneaten food should be monitored carefully.
- Bioload
- Batfish produce a very high bioload as they grow rapidly into massive, deep-bodied adults. They eat large amounts of food and consequently excrete substantial waste. Powerful filtration and a protein skimmer are mandatory to handle their output. Frequent water changes are required to maintain water parameters in check.
- Flow
- Stagnant
- They prefer moderate water flow that provides good oxygenation without blowing them around. While they grow into strong swimmers, juveniles can be battered by excessively strong powerheads. A varied, broad current across a very large tank best mimics their natural habitats. Ensure there are calmer areas where they can rest at night.
- Reproduction
- Oviparous
- Breeding Platax orbicularis in a home aquarium is practically impossible due to their massive adult size and pelagic spawning behavior. In the wild, they form large aggregations to broadcast spawn their eggs into the water column. The larvae develop in the open ocean before settling in coastal areas. Commercial breeding is typically done in large outdoor aquaculture facilities.
- Compatibility & tankmates
- Platax orbicularis is generally peaceful but will consume any fish or invertebrate small enough to fit in its mouth. They are not considered reef safe, as they may nip at corals and consume crustaceans. They should be housed with other large, peaceful marine fish. Avoid aggressive tankmates that might nip their long fins.
- Tank level
- Middle
- They are mid-to-top water column swimmers that require vast amounts of open swimming space. Their impressive vertical height means standard aquariums are completely unsuitable; they need very tall and deep tanks. They will patrol the entire length of the aquarium, frequently interacting with the aquarist. They rarely hide once fully acclimated to their environment.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 3.3 ± 0.49 se
- Resilience
- Medium (1.4 - 4.4 years)
- Phylogenetic uniqueness (PD50)
- 0.5313
- Bayesian Length-Weight
- a = 0.03311, b = 2.95
- VulnerabilityModerate vulnerability (44 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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