The Fish Hoek Surf Life Saving Club has set up a permanent shark watch to patrol the beach and scare off sharks that have caused panic among swimmers.
On Saturday, there were at least three shark alerts and people were told to get out of the water when a 3m shark was spotted about 100m offshore.
The shark watch initiative follows the fatal attack on Fish Hoek resident Tyna Webb, 78, this week.
Martin Williams, chairperson of the club, said the safety of beachgoers was a priority and would not be compromised.
He said an inflatable boat would be at the beach 12 hours a day from 7am and would patrol even after the festive season.
The club and law enforcement officials had formed a partnership with trek fishermen who were on the mountain slopes daily to spot the whereabouts of fish. The fishermen would radio shark warnings to the life guards.
A loud siren would then be set off warning people to get out of the water.
Williams said the operation was very efficient and made it easy to avert potential incidents.
"The fact that people were out of the water within a minute of a shark alert shows that the system is working." he said.