A 3.5 metre tiger shark has been sighted off Perth's Trigg Beach.
The rescue helicopter spotted the shark about 300 metres off shore just before 8:00 am.
It was swimming in a south westerly direction.
Trigg beach has been closed.
perth, recreation, beach, shore, metre, 300 metres, rescue helicopter, orders of magnitude, bull shark, oceanic whitetip shark, great white shark, shark sighting, requiem shark, trigg beach, metre tiger shark, south westerly direction