Ambon Puffer
Canthigaster amboinensis
The Ambon toby is a swift, intelligent pufferfish known for intensely foraging among live rocks. It demands ample caves and tunnels but remains unsafe for corals, devouring most soft invertebrates.
Water Temperature
23 - 27 °C
pH Value
8.1 - 8.4
Water type
Marine
Tank level
Bottom and middle
Adult size
15 cm
Minimum tank volume
>= 200 L
Minimum group
>= 1
KH
8 - 12 dKH
Species description
Geographical Origin and Habitat: The Ambon puffer is native to the tropical Indo-Pacific, ranging from East Africa to the Hawaiian and Galapagos Islands, and from southern Japan to Australia. It inhabits shallow coral reefs, surge zones, and rocky shores at depths between 1 and 16 meters, where water movement is often turbulent.
Taxonomy and Morphology: A member of the Tetraodontidae family and the genus Canthigaster. It features a moderately compressed body with a prominent snout and a beak formed by fused teeth. Its scale-free skin is covered in tiny, flat prickles. Adults grow to a maximum size of 12 to 15 cm.
Social Behavior: Solitary and highly territorial, especially towards other puffers or similarly shaped fish. It is an inquisitive swimmer, spending the day investigating the substrate for prey. It may nip the fins of slower-moving or long-finned tankmates.
Coloration and Sexual Dimorphism: The body coloration is dark brown to olive, densely covered in small, iridescent blue-green spots. Radiating blue lines project outward from the eyes. No external sexual dimorphism is present, although mature females may appear fuller in the abdomen.
Care, breeding and tankmates
Aquarium Setup: Needs a minimum tank size of 150 liters (40 gallons). Furnish the aquarium with plenty of live rock arranged to form tunnels and visual barriers to satisfy its foraging instincts. It is not reef-safe, as it will chew on stony corals, soft corals, anemones, and invertebrates.
Diet and Feeding: Requires a varied omnivorous diet. Feed meaty foods such as mysis, brine shrimp, chopped krill, and table seafood. Crucially, offer hard-shelled items (snails, unpeeled shrimp) to naturally wear down its dental plates. Supplement with seaweed or spirulina flakes.
Water Quality: Demands high water quality: temperature 24-27°C (75-81°F), pH 8.1-8.4, specific gravity 1.020-1.025, and KH 8-12. Due to their lack of scales, they are sensitive to nitrogenous wastes. A strong protein skimmer and regular water changes are required.
Compatibility and Cohabitation: Best kept in a fish-only-with-live-rock (FOWLR) tank alongside active tankmates like tangs, large wrasses, and aggressive damselfishes. Do not house with ornamental shrimp, crabs, snails, or feather dusters, as they will be eaten.
Aquarium Breeding: Not successfully bred in home aquaria. In nature, they engage in pair spawning, depositing demersal eggs in nests on the seafloor. The planktonic larvae require specialized microscopic live foods and are extremely difficult to raise.
Risks and Diseases: Prone to marine ich (Cryptocaryon) and marine velvet (Oodinium) under stress. Fused teeth can overgrow if the diet lacks hard shells. Contains lethal tetrodotoxin in its tissues. Never catch this fish with a net that allows it to inflate with air.
Geographic Origin and Distribution
The Ambon puffer is native to the tropical Indo-Pacific, ranging from East Africa to the Hawaiian and Galapagos Islands, and from southern Japan to Australia. It inhabits shallow coral reefs, surge zones, and rocky shores at depths between 1 and 16 meters, where water movement is often turbulent.
Origin
Tropical oceans and reefsAfrica and MadagascarEast AsiaAustralia, New Guinea, and Oceania
Fish profile
- Temperament
- Territorial
- The Spider-eye toby is active and sometimes nippy, displaying a high level of curiosity and intelligence. They will often closely observe events happening outside the aquarium. While they don't aggressively attack other fish, their inquisitive nipping can be a nuisance to passive tank mates. They possess a bold personality packed into a very small, maneuverable body.
- Diet
- Omnivore
- The Spider-eye toby has a varied omnivorous diet and requires meaty foods to thrive. They should be offered small mysis shrimp, chopped krill, and finely diced clams. It is important to include hard-shelled foods occasionally to help keep their beak-like teeth filed down. They will also graze on natural algae and small organisms present on the live rock.
- Life expectancy
- 5-10 years
- Canthigaster amboinensis, known for its hardiness, has a lifespan in the aquarium ranging from 5 to 10 years. Achieving this requires careful water quality management and a targeted diet. A spacious tank and a stress-free environment help prevent skin bacterial infections to which the species is susceptible.
- Adult size
- 15 cm
- The catalog's scalar value is 15 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 15 cm for this species, recorded as total length (TL). The taxonomic record consulted is Canthigaster amboinensis (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
- Harem
- Sexing the Spider-eye toby visually is difficult, though males may sometimes be slightly larger or more brightly colored. In the wild, they often live in small harems with one dominant male and several females. In a standard home aquarium, it is usually safest to keep them singly to avoid conspecific aggression. If keeping a pair, a very large tank with abundant hiding spots is required.
- Feeding frequency
- Twice daily
- These active little fish should be fed two to three times a day in small portions. Frequent feeding helps curb their tendency to nip at corals or the fins of their tank mates. They have a high metabolism and are constantly on the move, burning energy quickly. A varied feeding schedule ensures they receive a balanced nutritional profile.
- Bioload
- The Spider-eye toby produces a relatively low to moderate bioload compared to larger puffer species. Because of their small size, their waste output is easily handled by standard biological filtration. However, they are messy eaters, so a good protein skimmer is highly recommended. Routine water changes will ensure the water remains pristine and free of excess nutrients.
- Flow
- Moderate
- Moderate water flow is ideal for the Spider-eye toby, providing enough current to mimic their natural reef environment. They are agile swimmers and enjoy navigating through gentle to medium currents. Overly strong, chaotic flow can be stressful and make it difficult for them to feed properly. Providing a mix of flow zones allows them to explore comfortably.
- Jump risk
- No
- Reproduction
- Oviparous
- Breeding the Spider-eye toby in captivity is extremely rare and difficult. They are known to be demersal spawners, laying eggs in a prepared nest or among algae in the wild. The male typically guards the eggs until they hatch into tiny pelagic larvae. The difficulty of raising these microscopic larvae means captive-bred specimens are largely unavailable.
- Compatibility & tankmates
- Reef safe
- While generally peaceful, the Spider-eye toby is notorious for being a fin-nipper, especially towards slow-moving, long-finned fish. They are not considered strictly reef-safe because they may nip at stony corals, zoanthids, and small invertebrates. They are best kept in a FOWLR setup or a carefully planned reef with noxious soft corals. Fast-moving, short-finned tank mates make the best companions.
- Tank level
- Middle/Bottom
- They are predominantly mid-to-bottom dwellers, spending most of their time hovering around live rock. The Spider-eye toby constantly inspects crevices and caves searching for small crustacean prey. They rarely swim openly at the very top of the water column unless food is present. A tank with a complex aquascape provides the environmental enrichment they crave.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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