The man’s surfboard was found, but was not located, police said in the statement.
Shortly after the attack, authorities received a public report of a shark sighting at the beach, the DPIRD said. The species was unknown.
The beaches in the area have since been closed. The water police are conducting a maritime search and rescue operation, with additional ships deployed to provide assistance.
According to the Taronga Conservation Society Australia̵
McGowan said the southern coast of the state, especially near Esperance, was a known breeding ground for sharks such as great whites.
Esperance is located approximately 720 kilometers (447 miles) southeast of the state capital, Perth, and is a popular diving spot.
There have been numerous shark attacks near Esperance in recent years, most notably in 2017 when Laeticia Brouwer, 17, was killed while surfing with her father.
Numerous attacks have also been reported in other Australian states in recent months, including Queensland, New South Wales and Tasmania.