Sharks versus humans: Who threatens who?: A third of sharks and rays in South Africa’s waters are threatened with extinction — mainly due to human activity, such as fishing
Since 2017, great white sightings by Shark Spotters have declined, reaching fewer than five last year.
“There appears to have been an eastward shift in white shark distribution along the coastline … There could be numerous drivers of this, including the presence of orcas that prey on sharks,” she added. In 2017, when white shark sightings started declining in False Bay, killer whales also started to attack white and bronze whale sharks.
The phenomenon of orcas preying on large, coastal sharks has also been recorded in the United States, Australia and South America. “Observing sharks is difficult, and most sharks are not tagged, and even if they are tagged, the data might not be in real-time. Most of their behaviour remains hidden from us.”, has given a grossly distorted picture of the menace posed by sharks to humans.shows only 73 unprovoked shark-bite incidents took place globally during the whole of last year — just nine of them fatal.
“Other emerging threats are changes in ocean temperatures and ocean acidification, both due to climate change,” explained Kock, adding: “Large sharks face few natural hazards and the natural threats are significantly smaller than anthropogenic [human-made] ones.”
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