The Yellow Boxfish (Ostracion cubicus) is one of the most fascinating marine creatures you’ll encounter around Koh Tao. Known for its vibrant yellow body and box-like shape, it’s easily recognisable and a favourite among Scuba divers. Juveniles are a brilliant yellow with black spots, while adult Yellow Boxfish tend to be less vivid, often with a more muted shade and fewer spots.
The Yellow Boxfish's size varies as it grows. Juveniles can be as small as a few centimetres, while adults can reach up to 45 centimetres in length. Their habitat consists primarily of coral reefs and lagoons, where they can be spotted slowly navigating through the water. Around Koh Tao, they are commonly found in the reef systems, where they feel safe and can forage for food.
In terms of diet, the Yellow Boxfish is an omnivore, feeding on a mix of algae, small invertebrates, and sponges. Despite their slow movements, they’re effective foragers, thanks to their unique jaws that allow them to scrape food off hard surfaces.
One of the most remarkable aspects of the Yellow Boxfish is its natural defence mechanism. When threatened, it can release a toxic substance known as ostracitoxin, which is harmful to predators and even other fish in its vicinity. This poison acts as a deterrent, keeping most predators at bay.
The Yellow Boxfish lifespan can extend up to 10 years, though survival rates in the wild can be impacted by environmental conditions and predators. Fun facts about this species include its incredible ability to change shape during growth and its awkward, yet endearing swimming style, which makes it look like it’s floating rather than swimming.
While they are generally safe from predators due to their toxins, certain species, like sharks, are immune to the Yellow Boxfish's defensive mechanisms and can pose a threat.
The Yellow Boxfish is not only a visual treat but also a remarkable example of nature’s creativity in form and function. Its scientific name, Ostracion cubicus, perfectly describes its iconic boxy shape. Next time you’re diving around Koh Tao, keep an eye out for these quirky reef dwellers!
Want to see them for yourself? Join Phoenix Divers for an unforgettable dive, and let’s explore the underwater world of Koh Tao together.
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Phoenix Divers is a close-knit dive school on Sairee Beach, Koh Tao, offering a warm, family-like atmosphere and personalised diving experiences. Our beachfront dive centre, training pool and accommodation are perfect for both relaxation and adventure.
We teach SSI courses from beginner Open Water to Advanced and also to Divemaster and Instructor levels. Our small group of four per group ensure each diver receives individual and personalised attention. With a purpose-built dive pool, four classrooms, and two big pink dive boats, we blend friendly and professional facilities with a personal touch. More than just a dive school, Phoenix Divers is a community where you'll feel at home while exploring Koh Tao’s underwater wonders. Join us for unforgettable diving experiences!
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