'Radical' label incenses shark protesters

Protesters against the West Australian government's now-abandoned shark cull are incensed their image has been used in a federal government pamphlet on how to spot extremism.

The photo shows hundreds of people at Cottesloe Beach holding signs with sentiments such as "protect sharks from mindless predators" and is the first image after the introduction in the document, which intends to teach students how to detect radicalisation.

WA opposition spokesman for fisheries Dave Kelly says the use of the image is an "outrageous insult" to the rally attendees.

He also lashed Attorney-General George Brandis, whose department published the document.

"This is the attorney-general who says you've got every right to be a bigot but people who participated in a peaceful rally about protecting our environment, he's linking them to terrorism," Mr Kelly told AAP.