Four live and one dead sea turtles were washed up on Nai Yang Beach on Thursday morning.
All of them were stuck in fishing nets.
Sririnat National Park officers were notified this morning.
The five turtles were stuck in one big fishing net. Four are Olive Ridley turtles and the other one is a Hawksbill. One of the live sea turtles had a leg missing.
The Phuket Marine Biological Centre staff in Cape Panwa visited the beach.
An officer from the Sririnat National Park said fishermen must not throw old fishing nets into the sea as they can wash up on beaches and catch many sea creatures as they float around.
Many sea turtles have been found stuck in old fishing nets along the coast of Phuket.