The crown of thorns starfish looks spectacular, but it’s considered one of the ocean’s most destructive reef predators. Covered in sharp venomous spines, this coral-eating creature feeds by spreading its stomach over live coral tissue. When populations suddenly boom, entire coral gardens can disappear in just a few weeks.
Marine parks and dive teams keep a close eye out for outbreaks, especially around popular dive areas. In Thailand, you’ll often hear about removal missions where divers inject or collect these starfish one-by-one. Scientists believe pollution, warmer waters, and fewer natural predators all play a role in outbreaks.
While total control is tough, early monitoring makes a massive difference. Healthy reefs are more likely to recover after an invasion, but only if future stress is reduced. Divers can help by reporting sightings, avoiding touching coral, and choosing eco-friendly tour operators. With enough awareness and effort, reefs have a chance to stay colorful and thriving — even with the crown of thorns lurking nearby.
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