There are plenty of Sea Urchins in Pulau Seribu. They are indication that the ecosystem in the sea are distorted and not conducive for turtle habitats to live.
Below is an extract from britannica.com for definition of Sea Urchins
Sea urchins have a globular body covered with movable, sometimes poisonous, spines up to 12 in. (30 cm) long. Pores along the internal skeleton accommodate slender, extensible, often sucker-tipped tube feet. Sea urchins live on the seafloor and use their tube feet or spines to move about. The mouth is on the body's underside; teeth are extruded to scrape algae and other food from rocks. Some species excavate hiding places in coral, rock, or even steel.
These Sea Urchins live on the sea floor or sticked in the corals. Always be careful when you snorkel or dive. If you did step into them, get someone to help you to get a doctor.
The Local said the first thing you can do is to knock at your feet using your hand in repetitive motion to break those spikes which has penetrated inside your feet to prevent infection
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