The officers conducted an inspection at Yamu Pier under an operation authorised by Phuket Governor Sophon Suwannarat and Phuket Marine Chief Natchapong Pranit, said an official report of the raid.
The operation is in line with the provincial policy to ensure maritime safety and compliance with regulations, said the report.
During the inspection, officers identified six jet-skis operating without licenses, a violation of Section 9 of the Thai Navigation Act, B.E. 2456, as amended by Section 60 (No. 14) B.E. 2535.
The operators, not named in the report, were fined B10,000 baht per illegal jet-ski, the maximum penalty under the law.
To prevent future violations, the Phuket Marine Office issued a directive prohibiting unlicensed jet skis from providing services to tourists, the report said.
Operators were reminded to adhere to legal requirements to avoid further penalties, the report concluded.