An academic who's doing a thesis on the politics of shark attacks has compared Western Australia's policy to the Hollywood blockbuster Jaws.

The University of Sydney's Christopher Neff says WA's "imminent threat" policy is based on the Steven Spielberg movie about a rogue man-eating shark, which was adapted from the 1974 novel by Peter Benchley.

He says it reflects three themes from the film: that sharks mean to kill, all encounters between humans and sharks are fatal, and the only solution is to kill the sharks.

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"This fiction serves an important political purpose because films allow politicians to rely on familiar narratives following shark bites to blame individual sharks in order to make the events governable and to trump evidence-based science," he said.

The WA government recently withdrew an application to the federal government to extend its controversial drumline program, which uses baited fishhooks, but wants blanket permission to kill sharks when their presence in the water is deemed too risky to humans.

A spokeswoman for federal Environment Minister Greg Hunt says the Commonwealth is yet to receive the proposal.

She rejected a claim by activist group Sea Shepherd that the WA government deployed drumlines off Esperance about 90 minutes before receiving written permission to kill two white sharks following an attack on surfer Sean Pollard on October 2.

The state government had followed an agreed protocol, giving it "a temporary and limited exemption" to kill sharks to protect public safety, she said.

Read next: The hunt for NZ's mega-shark

- AAP