An incredible 3,000-mile journey by a basking shark has forced scientists to rethink their theories on the rare species.
Until now, it was thought that basking sharks were only found in temperate waters, but when a five-metre female — named Banba and tagged off Malin Head — was found to have travelled to the western coast of Africa, near Senegal, it turned the idea on its head.
Banba was one of five basking sharks tagged as part of the Monster Munch Basking Shark Community Awareness Project, run by the Irish Basking Shark Study Group with Inishowen Development Partnership and Queen’s University Belfast.
She was tagged with a satellite transmitter in July when she was feeding on plankton and the tag popped off on December 13 west of the Cape Verde Islands — 3,000 miles from the north coast of Ireland.
Until now, most tagged sharks have only travelled one or two hundred miles offshore onto the continental shelf edge in winter, returning to coastal waters in the summer so Banba’s odyssey to Africa’s warm tropical waters had scientists scratching their heads.
Basking shark researcher Emmett Johnston said: “Up until now there have been lots of different theories put forward about the sharks and one was that they hibernated over the winter because there wasn’t enough food in the waters around the north Atlantic.
“Other people said they went offshore and they have been tracked offshore in the winter.
“But we have been theorising that they head further south to where the food is, like the larger whales from this area.”
Read more: http://www.belfasttelegraph.co.uk/news/environment/banba-the-basking-sharks-amazing-3000mile-journey-leaves-experts-openmouthed-16257134.html#ixzz2HUfctrHk