The sea creatures were found scattered along several sections of the beach on October 4 and 5. They are about half the size of a rambutan, with white and brown markings and bodies covered in stiff, sharp spines.
According to Nguyen Tac An, former director of the Nha Trang Institute of Oceanography, the sea urchins normally live at depths of 10-16 metres.
Changes in weather, rough seas or large waves can disturb the seabed, allowing currents and waves to gradually carry the animals towards the shore, he said.
“This is a normal natural phenomenon and not a sign of anything unusual,” An added, adding that sea urchins play a role in the marine ecosystem, including helping filter water, and can also be used as food.
However, large numbers of sea urchins on the beach could pose a risk to residents and tourists. Their sharp spines can pierce the skin if stepped on or touched, causing pain and swelling.
An advised beachgoers to watch where they step while swimming or walking along the shore.
Dam Hai Van, head of the Nha Trang Bay Management Board, said hundreds of sea urchins had washed ashore in several areas of Nha Trang in recent days.
The board has deployed staff to collect and dispose of the animals to ensure environmental hygiene and public safety.
Similar occurrences were recorded in Nha Trang in 2014 and 2019, according to local authorities.
People who accidentally step on a sea urchin and develop unusual symptoms are advised to seek medical attention.
