“For some unknown reason, the killer whales have developed a penchant for breaking the rudders of sailboats and once they have achieved this, they leave the boat alone,” Volker Deeke, professor of wildlife conservation at the University of Cumbria, said. He told The Telegraph the incidents should not be viewed as attacks.
“During interactions, the animals remain cool, calm and collected without any of the behavioural signs of aggression such as splashing, or vocalisations,” he said.
But he said it “cannot be ruled out” that similar incidents to those seen around the Iberian Peninsula could occur in British waters in the future.
He added: “UK sailors transiting the hotspots should definitely familiarise themselves with the guidance. The same guidance applies for sailors encountering any killer whales in Cornish waters.”
The guidance given to sailors in the Strait of Gibraltar includes to stop the boat engine and lower the sails immediately if orcas are spotted, turn off autopilot and echo sounders and not to make loud noises in an effort to scare them away.
Other advice includes avoiding hotspots in the first place and, most crucially, to stay in shallow waters of about 20 metres in depth, where orcas do not like to swim.
Dr Javier Almunia, director of the Loro Parque Foundation, told The Telegraph: “The behaviour has reduced, at least in the Gibraltar Strait, by around 90 per cent following the recommendations of the Spanish authorities.”
Spain recommends that boats do not stop but instead go full speed towards shallower waters, which makes it harder for the orcas to headbutt the rudders.
Dr Almunia said that if the interaction in the Basque Country was confirmed “it can be explained by the same animals moving around the Iberian Peninsula”.
“So far there’s no evidence of different pods to the ones that are visiting Gibraltar in summer learning this behaviour,” he said in comments that will reassure British sailors.
Orcas surf in the wake of a fishing boat off the coast of Loreto, in Baja, Mexico.Credit: Loreto Cast N’ Reel Charters
“There’s no evidence of the behaviour moving on or being transferred to a different pod.”
Marine biologists believe that the whales may be attacking out of boredom. Other theories are that the whales are exhibiting territorial, defensive, or playful behaviour.
It has also been suggested that a female orca called White Gladis taught gangs of the apex predators to attack the boats after being traumatised by a collision with a boat, or being trapped in illegal fishing nets.
The first reports of aggressive orcas off the Iberian coast began in May 2020. In September of that year, Spanish authorities banned boats from setting sail from the country’s north-western tip after 29 orca attacks were registered. At least six vessels have been sunk since 2021, including two last year.
The orcas have been targetting boats in the Strait of Gibraltar.
Two crew members were rescued unharmed in May 2024 when the 15‑metre yacht Alboran Cognac sank in the Strait of Gibraltar after repeated ramming by Iberian orcas.
In July, the British yacht Bonhomme William sank in the Strait of Gibraltar after it was attacked at night. All three on board were rescued.
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Two attacks in quick succession in August 2023 were the first ramming incidents involving orcas reported in waters off the Basque Country.
A pod of about five orcas struck the rudder and hull of a sailboat about 20 miles north of Zumaia without causing major damage, followed by an incident involving a French trimaran travelling about 18 miles north of Ondarroa. Both boats needed only minor repairs.
The Telegraph, London
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