Yellow Boxfish - Ostracion cubicus

Yellow Boxfish (Ostracion cubicus)

The Yellow Boxfish (Ostracion cubicus) is a unique and eye-catching saltwater fish known for its bright yellow color and distinctive boxy shape. With its charming appearance and relatively calm demeanor, this species is a popular choice for marine aquariums, though it requires careful care due to its sensitivity to water conditions and potential toxicity.

Description:

• Common Name: Yellow Boxfish

• Scientific Name: Ostracion cubicus

• Family: Ostraciidae

• Size: Up to 18 inches (45 cm) in the wild, though typically around 10-12 inches (25-30 cm) in captivity

• Color: Juveniles are bright yellow with black spots, while adults may fade to a more subdued yellow or brownish hue. The distinctive boxy body shape remains consistent throughout life.

Native Region:

The Yellow Boxfish is found throughout the Indo-Pacific region, including areas around the Red Sea, East Africa, Japan, and Australia. They inhabit coral and rocky reefs in lagoons and coastal waters.

Aquarium Setup:

• Tank Size: Minimum of 150 gallons (570 liters) for an adult due to its potential size and need for swimming space

• Temperature: 72-78°F (22-26°C)

• Salinity: 1.020-1.025 specific gravity

• Substrate: Fine sand or crushed coral, with live rock formations for shelter. The tank should have plenty of open swimming areas as well as hiding spots.

• Diet: Omnivorous; feed a varied diet that includes marine algae, high-quality pellets, and frozen foods like shrimp, krill, and marine fish. Supplement their diet with spirulina and vegetable matter to ensure proper nutrition.

Care Level:

• Difficulty: Moderate to advanced

• Temperament: Generally peaceful and slow-moving. However, care must be taken as they can release toxins (ostracitoxin) when stressed or injured, which can harm other tank inhabitants.

• Lifespan: 5-10 years in captivity

Additional Tips:

• Tank Mates: Ideal tank mates include other peaceful fish such as tangs, angelfish, and butterflyfish. Avoid keeping with aggressive species or fish that may nip at their fins. Also, ensure that the tank is not overstocked to avoid stressing the Boxfish.

• Behavior: Yellow Boxfish are slow swimmers and often display curious and calm behavior. They spend much of their time exploring their surroundings and grazing on algae and detritus. They are generally non-aggressive, making them ideal for peaceful community tanks.

• Water Quality: Consistent, high-quality water is essential. Regular water changes and efficient filtration are necessary to prevent stress, which could lead to the release of toxins. Ensure stable water conditions, as sudden fluctuations can be harmful to this sensitive species.