Jellyfish warning issued for Koh Racha Yai

A jellyfish warning was issued for Koh Racha Yai, a popular island 20 km south of Phuket, on 24 March 2026 after several stings were reported by local tour operators. The alert was announced by the Phuket Marine Office in response to increased sightings near the island’s main beaches.

Increased Jellyfish Activity Triggers Safety Measures

Marine officials confirmed that at least five tourists experienced jellyfish stings between 22 and 24 March, prompting the advisory. Lifeguards have been instructed to display red flags and warning signs at Patok and Siam bays, the island’s busiest swimming areas. Operators of speedboats and snorkeling tours received updated protocols, including carrying vinegar and first aid kits on board. The Phuket Marine Office urged visitors to avoid swimming in marked zones until further notice.

Impact on Tourism and Ongoing Monitoring

Koh Racha Yai hosts over 1,000 visitors daily during peak season, with most arrivals from Chalong Pier. The warning coincides with the start of the Andaman Sea’s annual jellyfish season, which typically runs from March to June. Marine biologists from the Phuket Marine Biological Center have begun water sampling to identify the species involved. Local businesses reported a 15% drop in day-trip bookings following the announcement.

Phuket Marine Office stated it will reassess the situation on 28 March, with updates to be provided if conditions change.

Source: https://www.thephuketnews.com/jellyfish-warning-issued-for-koh-racha-yai-99660.php