Patong lifeguards raised the alarm on Saturday evening (Aug 31), reported the Department of Marine and Coastal Resources (DMCR) Research Center (Upper Andaman Sea) located at Cape Panwa.
A team of marine biologists was dispatched, and in total 40 bluebottles were found, and collected at the beach.
So far, no incidents have been reported, the DMCR noted.
Officers from the DMCR distributed warning leaflets to the public, local businesses and tourists, urging swimmers to take extra precautions.
Lifeguards are on alert to provide first aid in case of jellyfish stings and will monitor the waters closely for any further presence of the jellyfish.
A sting from a bluebottle can cause intense pain and whip-like marks on the skin. For first aid, experts recommend washing the sting area with seawater and either submerging it in hot water or applying a dry cold pack for 20 minutes to relieve pain. Vinegar should not be used on bluebottle stings.