Saltcorner
By Bob Goemans
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Ostracion

Ostracion cubicus

Linnaeus, 1758

Spotted Boxfish, Yellow Boxfish, Cube Boxfish

Not Reef Tank Suitable

Likely Fish-Only Tank Suitable

Range: Indo-West Pacific Ocean: Red Sea and East Africa to the Hawaiian Islands and Tuamotu Islands, north to Southern Japan, and south to Lord Howe Island.

Size: 18 inches (45 cm)

Natural Environment: Inhabits lagoon and semi-sheltered seaward reefs and usually found at depths between 3 – 150 feet (1 – 45 m) where it feeds on algae, benthic invertebrates and small fishes.

General Husbandry: Occasionally seen in the trade with juveniles having a bright yellow body with blue or black spots and adult’s a darkish yellow with dark spots.

Best maintained in large fish-only aquariums having wide-open swimming areas and slow moving and very peaceful tankmates.

Requires a varied diet containing both meaty and vegetable matter, and should be fed several times daily.

Taxonomy:

    Order: Tetraodontiformes

    Suborder: Tetraodontoidei

    Family: Ostraciidae

    Genus: Ostracion

FYI: A slow moving fish, therefore, it should not be housed with fast moving and/or fin-nipping fishes.

Will eat snails, ornamental shrimp and smaller fishes.

One per aquarium.

Do not offer floating foods, as this species may ingest air and cause buoyancy problems.

May consume cyanobacteria/slime algae and other types of macro and microalgae.

When excited or threatened can release a toxin (ostracitoxin) that may kill other fish.

Activated carbon will remove the toxin, however, it may be too late to save it or its tankmates once it happens.

Always remove a specimen if it's being picked on or in bad health.

Experience Level: Expert

Temperament: Peaceful

Diet: Omnivore

Coral Safe: Yes

Fish Safe: No

Invertebrate Safe: With caution

Acclimation Time: 30 minutes+

Aquarium Environment: Fish-only aquarium

Tankmates: Peaceful, yet larger

Minimum Tank Size: 250 gallons

Temperature Range: 72 - 79°F (22 – 26°C)

Specific Gravity: 1.020 - 1.026

pH: 8.0 - 8.5

 Ostracion cubicus (Spotted Boxfish, Yellow Boxfish, Cube Boxfish)
Photo © Bob Fenner
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San Francisco Bay Brand