Orcas Used Tonic Immobility to Hunt Great White Sharks
Research revealed that orcas flip sharks to induce paralysis, consuming their nutrient-rich livers to survive.
Updated on Oct. 8, 2026 in Wildlife
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On June 18, 2023, a male orca known as Starboard successfully killed a 2.5-meter juvenile great white shark alone. This behavior utilizes tonic immobility, a state of paralysis triggered by flipping the shark onto its back.
Why it matters
Orca hunting pressure is forcing great white sharks to permanently abandon traditional habitats like Gansbaai, South Africa. This predator migration creates a cascading effect on local ecosystems, including rising seal populations and increased threats to African penguins.
Adult orcas weigh roughly 8 tons and reach 10 meters in length, compared to adult great whites that typically weigh 1-2 tons. In Gansbaai, South Africa, the shark population previously numbered roughly a thousand individuals.
The players
Starboard
Starboard is a male orca identified by researchers as an active hunter of great white sharks.
The details
Orcas target the nutrient-dense livers of sharks, using group tactics to overpower larger adults. By inducing tonic immobility, they effectively neutralize the defensive capabilities of the sharks, allowing them to feed without risk of injury.
Timeline
June 18, 2023: A solitary male orca attacked and killed a juvenile great white shark.
Culture Shift
This predator behavior signals a broader shift in our understanding of marine apex dynamics as orcas increasingly displace sharks from historically stable coastal ecosystems. This phenomenon challenges long-held views regarding the permanence of shark territories in regions like South Africa, Australia, and Mexico.
For regions experiencing shark displacement, local coastal communities may observe significant changes in marine life populations, such as increased seal activity. These ecological shifts can influence local tourism and fishing routines that rely on established marine biodiversity.
The takeaway
Understanding these predatory tactics highlights how top-tier marine mammals can rapidly alter regional biodiversity. Protecting habitats requires monitoring these natural shifts rather than assuming predator-prey populations will remain static over time.
Further reading
Learn more about marine ecosystem dynamics in the Wildlife section.
Source note: This article includes information reported by PravdaReport.
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