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A new study out of the United Kingdom is pointing to collisions with large marine vessels as a possible reason for the years-long decline in whale shark populations.
Marine biologists from the Marine Biological Association and University of Southampton led the study, started in 2019 and published earlier this month in the journal Proceedings of the National Academy of Sciences, which tracked the movements of ships and whale sharks around the world.
The researchers said lethal collisions are vastly underestimated and that their work shows more than 90 per cent of whale shark movements overlapped with global fleets of cargo, tanker, passenger and fishing vessels.
The team satellite-tracked the movements of 348 individual whale sharks, tagged between 2005 and 2019 in the Atlantic, Indian and Pacific Oceans, and mapped out their various "hotspots."
The researchers submitted the data to the Global Shark Movement Project, which is led by the Marine Biological Association.
"The maritime shipping industry that allows us to source a variety of everyday products from all over the world may be causing the decline of whale sharks, which are a hugely important species in our oceans," Freya Womersley, a University of Southampton PhD researcher who led the study as part of the Global Shark Movement Project, said in a press release.
The International Union for Conservation of Nature's Red List of Threatened Species lists the whale shark as endangered.
Described as "slow-moving ocean giants," the researchers said whale sharks can grow up to 20 metres in length and help regulate plankton levels in the ocean by feeding on microscopic zooplankton.
The researchers said whale shark numbers have been falling in recent years in many locations. However, the reasons why are not entirely clear.
Since whale sharks spend a large amount of time in surface water and gather in coastal regions, experts thought collisions with ships could be causing "substantial" deaths.
The study suggests that whale shark tag transmissions ended more often in busy shipping lanes than expected, even after ruling out technical failure.
Of the 61 tracked tags that stopped transmitting on busy routes, more than 85 per cent were unrelated to random technical failure, the study said.
The researchers suggest this is likely due to whale sharks being struck and killed, and sinking to the ocean floor.
"Incredibly, some of the tags recording depth as well as location showed whale sharks moving into shipping lanes and then sinking slowly to the seafloor hundreds of metres below, which is the 'smoking gun' of a lethal ship strike," said Prof. David Sims, Global Shark Movement Project founder and senior research fellow at the Marine Biological Association and University of Southampton.
"It is sad to think that many deaths of these incredible animals have occurred globally due to ships without us even knowing to take preventative measures."
The research team said there are currently no international regulations to protect whale sharks against ship collisions, and that this "hidden mortality" may be occurring with other marine megafauna.
"Collectively we need to put time and energy into developing strategies to protect this endangered species from commercial shipping now, before it is too late," Womersley said, "so that the largest fish on Earth can withstand threats that are predicted to intensify in future, such as changing ocean climates."
India's envoy to Canada insists relations between the two countries are positive overall, despite what he describes as 'a lot of noise.'
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