Seal attack! Hungry creature eats five blue sharks in rare images of sea mammal turning the tables on predator of the deep
Seals usually feed on fish, squid and crab, but will eat what they can find
The Cape fur seal can grow to 10ft long and can dive for up to 7.5 minutes
It is in competition for its preferred food - hake - with local fishermen
The male blue shark is usually lightweight and small
These extraordinary pictures show a South African seal devouring a blue shark - one of five that it attacked and ate for dinner.
The rare event took place off the coast of Cape Point and was witnessed and photographed by a group of shocked divers.
The seal ate only the stomach and liver of its prey before moving on to its next victim.
Carnage: A Cape fur seal grabs a blue shark in its jaws as it dines on five of the deep sea predators
'It was terrible to watch,' said South African photographer Chris Fallows, who owns a shark diving company.
He had been taking a group on an expedition when they found the sharks, which were all around three or four feet long (1.1 to 1.4 metres).
'Suddenly a large Cape fur seal arrived and proceeded to catch and kill its first, then second shark,' he said.
It ate a further two in quick succession, before another shark drew its attention an hour later and it pounced once more.
'This was too much for us,' said Mr Fallows. 'We moved about three miles away. We certainly did not want to attract any more sharks to this seal.'
Stopping for a bite: Seals compete for food with fishermen, and this one is big enough to beat its toothy target
The photographer said it was the second time he has seen a seal attacking and killing a blue shark, but he has never heard anyone else describe the event.
He suspects the seal only ate the stomach because it would have contained fish or squid, which form seal’s preferred diet, and the liver would have been a good source of energy.
'I guess itjust ate the parts that gave it the most use,' he said.
The pictures come on the same day as images of a fur seal chewing on a Maori octopus, known locally as 'The Kraken', off the coast of Australia.
Photographer Phil Davison captured the rare sighting in Rye pier on the Mornington Peninsula, while out with a group of open-water scuba divers.
Callan Duck, a senior research scientist at the University of St Andrews' Sea Mammal Research Unit, said: 'It's usually the other way around. There is a lot of footage of great whites eating seals, particularly pups who stray into their paths.
'Seal normally eat fish, and the usual diet for a Cape fur seal would be one of two species of hake.'
One of these species has great commercial value so the seal is in competition with fishermen when it comes to catching them.
Mr Duck added: 'It may be that there are not many photos of this happening, but that doesn't mean sharks cannot be part of a seal's normal diet.
'Cape fur seal can weigh up to 700lbs (300 kilos). It's a question of size. If you are smaller than me, I will eat you.'
The sharks are likely to have been males, which are smaller than the females at around 6ft long and just 60 to 120lbs.
Mr Fallows added: 'If karma does indeed exist, the seal had better watch out if it returns during the great whites’ winter hunting season.'
WHAT MAKES THIS SEAL SO TOUGH?
Fur seals have sharp eyesight, keen hearing and can grow to nine feet (3m) long, weighing up to 700lb (315kg).
It can live for up to 30 years, either gathering in small groups or swimming alone.
Many fur seal populations have not rebounded from extensive hunting - and now have to cope with overfishing, which can limit their prey.
The African fur seal lives around the southern and southwestern coast of Africa, while the Australian sub-species lives in Bass Strait, off Victoria in south-east Australia and off Tasmania.
An African fur seal’s diet is thought to be 70 per cent fish, 20 per cent squid and 2 per cent crab, although it will eat many other things it finds, including crustaceans, cephalopods and sometimes birds.
African fur seals can dive as deep as 204m and for as long as 7.5 minutes.
發表於 2013-2-1 04:22 AM
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