Humpback whale entangled in fishing line rescued off Dawesville coast | Video

Incredible footage has captured the moment a nine-metre whale was disentangled from fishing net off the coast of Mandurah.

The Humpback whale was reported to Fisheries Officers on Wednesday morning, approximately one nautical mile south of Dawesville.

In the video posted to the Parks and Wildlife, Western Australia Facebook page, fishing gear can be seen wrapped tightly around the whale's tail.

With the average weight of a humpback whale exceeding 30 tonnes, the rescue required delicate work.

Parks and Wildlife service officers fitted the whale with a satellite tracker to monitor the whale's whereabouts for a number of hours before safely letting it free.

Although appearing very tired, the mammal was swimming strongly, prompting a positive prognosis from officers.

The successful operation was met with high-fives and sighs of relief from those on board the rescue boat.

Local environmental groups threw their support behind the disentanglement, congratulating the Department of Biodiversity, Conservation and Attractions (DBCA) on their achievement.

In a post on Facebook, Estuary Guardians said they were thankful for the hard work of those involved.

"These guys always help us in Mandurah," the post read.

"Tasked with looking after wildlife everywhere, on limited budgets. Well done DBCA officers!"

If you spot an entangled or beached whale, keep a safe distance and call the Wildcare Helpline on 9474 9055.