Claims that shark deterrents qualifying for government rebates have not been adequately tested are "grossly inaccurate", according to Western Australia's Fisheries Minister Dave Kelly.

Mr Kelly's comments followed a letter to The West Australian on Tuesday from Liberal Senator Linda Reynolds disparaging the research behind the government's shark deterrent rebate.

He said in 2016, University of WA research paid for by the then-coalition government found the Shark Shield Freedom 7 worked in 90 per cent of occasions against a white shark.

The world-first personal shark deterrent subsidy is aimed at protecting surfers and divers, who have represented 13 of the 15 fatal shark bite victims in WA since 2000.