The NSRI is urging public caution due to an apparent increased shark presence along a section of the Eastern Cape coastline.
NSRI spokesperson, Craig Lambinon, said this was because of a whale carcass which washed up at St Francis Bay this week.
"A whale carcass that washed up on Anne Avenue Beach on the St Francis Bay coastline is believed to have caused a larger than normal shark presence in the area," said Lambinon.
"Sharks were spotted in the vicinity of the Kromme River and Anne Avenue Beach, off-shore of St Francis Bay, close in-shore, over the past few days and their perceived increased presence is believed to be directly related to the whale carcass that beached on Thursday and which was then subsequently towed out to sea on Friday," he said.
"Bathers, paddlers, divers, sail boarders are urged to be cautious," Lambinon said.