Key Takeaways
- A sub‑adult great white shark was sighted near Seal Island in False Bay on 23 September, the first confirmed sighting in eight years.
- The sighting sparked excitement among shark‑diving operators, but experts caution it is too early to declare a permanent return.
- The prolonged absence of great whites in the region has been linked primarily to predation by two specialist killer whales, nicknamed Port and Starboard, which target the sharks’ energy‑rich livers.
- Research by Dr Alison Kock and Dr Alison Towner documented the killing events, the sharks’ flight response, and the subsequent abandonment of traditional aggregation sites.
- The void left by the departing white sharks allowed bronze whaler (copper) sharks to increase their presence in the area.
- Continued monitoring is essential to determine whether the recent sighting signals a broader recovery or remains an isolated event.
Sighting of a Sub‑Adult Great White
On the morning of 23 September, clients and crew of African Shark Eco‑Charters observed a sub‑adult great white shark just north of Seal Island in False Bay. The animal approached a bait line that lacked a hook, allowing it to be released unharmed after taking the bait. Rob Lawrence, the company’s owner, described the encounter as a “big surprise” because great whites had not been reliably seen in the area for roughly eight years. Although the crew reacted with palpable excitement, Lawrence stressed that a single sighting does not yet indicate a return to former abundance levels.
Reaction from Eco‑Charters Crew and Local Experts
The video footage captured crew members Katie Phillipps, Poenas Jacobs, Eddie Kasanhayi, and Tshawe Cheminais expressing audible excitement as the shark latched onto the bait. Veteran whale‑watch operator Dave Hurwitz likened the event to a “second coming,” noting the heightened enthusiasm among locals who had missed the sharks’ seasonal presence. Hurwitz acknowledged uncertainty about whether larger adults would follow the juvenile’s lead, but he echoed the hope of several shark‑diving businesses that regular summer sightings might resume.
Historical Context of White Shark Disappearance
Prior to this recent sighting, great white sharks had largely vanished from False Bay and neighboring aggregation sites such as Gansbaai and Mossel Bay. The disappearance was not attributed to a single cause but rather to a combination of factors, including heightened predation by killer whales, pressures from commercial and recreational fisheries, and mortality resulting from shark‑net and bather‑protection programs along the KwaZulu‑Natal coastline. These stressors collectively reduced the sharks’ willingness to return to their traditional haunts.
Role of Killer Whales Port and Starboard
Two particular killer whales, identifiable by their distinctly floppy dorsal fins and nicknamed Port and Starboard, have been implicated in the targeted killing of great whites. Observations and photographic evidence show these orcas deliberately attacking white sharks to consume their fat‑rich livers, a high‑energy food source. The whales’ specialized hunting technique involves holding a shark in a semi‑inverted position, potentially inducing tonic immobility, which facilitates liver extraction while leaving the majority of the carcass behind.
Scientific Evidence from Kock and Towner
Dr Alison Kock of SanParks, together with Dr Alison Towner, compiled a research report that confirmed the killer whales’ role in the shark deaths. Their study documented five white shark carcasses recovered on Gansbaai beaches between February and June 2017, each exhibiting characteristic wounds and missing livers. The temporal coincidence of the carcasses with the presence of Port and Starboard provided strong evidence of causation. Following each predation event, white shark sightings at the Gansbaai aggregation site declined sharply, ultimately leading to a two‑and‑a‑half‑year abandonment of the location.
Impact on Shark Behavior and Ecology
The persistent threat posed by the killer whales triggered an immediate flight response in great whites, resulting in prolonged avoidance of the affected areas. This behavioral shift created an ecological vacuum that was quickly filled by bronze whaler (copper) sharks, which increased their presence in False Bay and surrounding waters. The change in predator dynamics highlights how apex‑predator interactions can cascade through marine ecosystems, altering community structure and potentially affecting prey populations such as seals and smaller fish.
Implications for Conservation and Future Outlook
The South African white shark population is already small and faces numerous anthropogenic threats, including habitat degradation, fishing pressure, and shark‑net mortality. The addition of specialist killer‑whale predation further compromises the species’ recovery prospects. While the recent sighting of a sub‑adult great white offers a glimmer of hope, experts such as Karen Lawrence (MD of African Shark Eco‑Charters) urge caution, emphasizing that sustained monitoring and mitigation of human‑induced risks are essential to determine whether the bay is witnessing a tentative resurgence or merely an isolated, transient visit. Continued research, protective measures, and public awareness will be key to shaping the future of great white sharks in False Bay.
