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Great Whites Vanish: Orcas or Humans to Blame?
13 Apr
Summary
- Great white sharks are disappearing from South Africa's waters.
- Orcas, or killer whales, have been observed eating great white sharks.
- Some experts blame human fishing practices for the shark decline.
Great white sharks have mysteriously disappeared from the coastal waters of Cape Town, South Africa, a region once teeming with these apex predators. This startling decline has led to a rift among scientists and conservationists, who disagree on the cause.
Marine biologist Alison Kock discovered evidence in 2015 suggesting orcas, also known as killer whales, are responsible for feeding on great whites, consuming their calorie-rich livers. This behavior was previously unobserved in the area, though orcas are known hunters elsewhere.
However, not all experts agree. Marine biologist Enrico Gennari and photographer Chris Fallows contend that human activities, particularly commercial longline fishing, have depleted the great whites' food sources. They also criticize South Africa's use of shark nets and baited hooks, which kill numerous great whites annually.
Proponents of the orca theory believe the intelligent whales may be teaching others to hunt sharks. Conversely, those blaming human impact emphasize that conservation efforts for charismatic species like great whites are crucial for the health of the entire ocean ecosystem.
Conservationists point to the successful recovery of humpback whales following whaling moratoriums as a model for achieving ecological balance.
