Fishermen on Lower Eyre Peninsula in South Australia have been caught trying to circumvent new Marine Park zones - by herding fish out of them.

Sixteen days after 83 controversial marine sanctuaries were implemented across the state, some fishers have tried to get around the laws by using their boat to move Kingfish into a different zone.

Marine Parks regional coordinator Shelley Harrison said the activity was illegal because the zones protect fish from "any" interference.

"Kingfish are a highly mobile species, so they would be quite hard to herd," she said.

"But because they're going in there to spawn, they're quite big fish, so it's easy to spot them.

"They bubble on the surface."

The implementation of sanctuaries on October 1 was lauded by conservationists and scientists who were keen to see some of the state's most significant breeding and feeding areas protected.

But it provoked outrage among fishing groups and stakeholders concerned with tourism and job losses in local communities.

A Liberal Party amendment to allow fishing in 12 of the new zones was defeated in State Parliament by just one vote last month.