The incident took place about 5 nautical miles from Jeffreys Bay at about 23h30.
The NSRI Jeffreys Bay sea rescue crew and NSRI Port Elizabeth were also placed on high alert.
“It appears that the fisherman may have fallen overboard as early as 21h00 and it is not known what caused him to go overboard”, said Marc Mey from NSRI.
“We conducted a search pattern plotted by the Maritime Rescue Coordination Centre but despite an extensive search nothing has been found and we were released from the search by the Ports Authority at 02h30″ added May.
The man was wearing oil skins and boots but had on no life-jacket. He is presumed to have drowned.
The matter has been handed over to the SA Police Services who will investigate the circumstances and continue a search.”
NSRI do not have the age of the man nor where the man is from.