Ostracion cubicus, commonly known as the Yellow Boxfish, inhabits the coral reefs of the Indo-Pacific region. Notable for its vibrant yellow color adorned with black spots, this species has a distinctive box-like shape. It exhibits a unique defense mechanism, releasing toxins when threatened, and plays a vital role in its ecosystem by controlling algae growth.

Ostracion cubicus, commonly known as the Yellow Boxfish, is native to the Indo-Pacific region. This species is commonly found in the warm, tropical waters of the Indian Ocean and the western Pacific Ocean. Its distribution ranges from the eastern coast of Africa, including the Red Sea, across to Japan, down through the Great Barrier Reef, and as far east as Hawaii.

The Yellow Boxfish typically inhabits coral and rocky reefs, often found in lagoon and seaward reefs. It prefers depths ranging from shallow waters of about 1 meter to deeper areas up to 50 meters. The water temperature in these regions is typically warm, aligning with tropical marine conditions.

Ostracion cubicus is a benthic species, meaning it primarily lives and feeds on or near the bottom of the ocean. Its diet consists mainly of algae, sponges, and small invertebrates. The species has a unique defense mechanism where it secretes a toxic substance from its skin when threatened, which can deter predators. This adaption allows it to thrive in its ecological niche, despite being a slow swimmer.