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‘Shark Fitbit’ Gives Researchers First-Ever Data From Basking Shark Response to Boat Strike

24th July 2024
File image of a basking shark in Irish waters
Basking sharks are the second largest fish in the oceans Credit: IWDG/Nick Massett

Researchers based in Co Kerry have detailed how they captured data — for the first time ever — of a basking shark’s response to a boat strike.

As RTÉ News reports, in April the team of scientists from Ireland and Oregon State University in the US attached what they called a “shark fitbit” to a seven-metre female basking shark off the coast of Kerry.

Just hours later, the marine wildlife giant was hit by a boat in an incident that made for “grim viewing”, according to Nick Payne, Assistant Professor in Trinity College Dublin’s School of Science.

Data from the device showed that the enormous shark immediately swam to the seafloor, moved to far deeper, offshore waters and significantly reduced her activity levels.

Several hours later the device released from the shark, and the fate of the animal is unfortunately unknown.

The incident is detailed in a paper published in the journal Frontiers in Marine Science, which also outlines the need for a legally binding code of boating conduct, similar to one devised by the Irish Basking Shark Group.

“The fact a shark we fitted our ‘fitbit’ to was struck in this area within a few hours underlines just how vulnerable they are to boats and highlights the need for greater education in how to mitigate against such strikes,” Payne says.

Published in Marine Wildlife
MacDara Conroy

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MacDara Conroy

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MacDara Conroy is a contributor covering all things on the water, from boating and wildlife to science and business

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Marine Wildlife Around Ireland One of the greatest memories of any day spent boating around the Irish coast is an encounter with marine wildlife.  It's a thrill for young and old to witness seabirds, seals, dolphins and whales right there in their own habitat. As boaters fortunate enough to have experienced it will testify even spotting a distant dorsal fin can be the highlight of any day afloat.  Was that a porpoise? Was it a whale? No matter how brief the glimpse it's a privilege to share the seas with Irish marine wildlife.

Thanks to the location of our beautiful little island, perched in the North Atlantic Ocean there appears to be no shortage of marine life to observe.

From whales to dolphins, seals, sharks and other ocean animals this page documents the most interesting accounts of marine wildlife around our shores. We're keen to receive your observations, your photos, links and youtube clips.

Boaters have a unique perspective and all those who go afloat, from inshore kayaking to offshore yacht racing that what they encounter can be of real value to specialist organisations such as the Irish Whale and Dolphin Group (IWDG) who compile a list of sightings and strandings. The IWDG knowledge base has increased over the past 21 years thanks in part at least to the observations of sailors, anglers, kayakers and boaters.

Thanks to the IWDG work we now know we share the seas with dozens of species who also call Ireland home. Here's the current list: Atlantic white-sided dolphin, beluga whale, blue whale, bottlenose dolphin, common dolphin, Cuvier's beaked whale, false killer whale, fin whale, Gervais' beaked whale, harbour porpoise, humpback whale, killer whale, minke whale, northern bottlenose whale, northern right whale, pilot whale, pygmy sperm whale, Risso's dolphin, sei whale, Sowerby's beaked whale, sperm whale, striped dolphin, True's beaked whale and white-beaked dolphin.

But as impressive as the species list is the IWDG believe there are still gaps in our knowledge. Next time you are out on the ocean waves keep a sharp look out!