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Reading: Shipping poses significant threat to endangered whale shark
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Dailynewsegypt > Blog > Environment > Shipping poses significant threat to endangered whale shark
Environment

Shipping poses significant threat to endangered whale shark

Daily News Egypt
Last updated: 2022/05/09 at 10:36 PM
By Daily News Egypt 3 Min Read
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Marine biologists from the Marine Biological Association (MBA) and the University of Southampton have led ground-breaking research which indicates that lethal collisions of whale sharks with large ships are vastly underestimated, and could be the reason why whale shark populations are falling.

Whale shark numbers have been declining in recent years in many locations, but it is not entirely clear why this is happening.

Because whale sharks spend a large amount of time in surface waters and gather in coastal regions, experts theorised that collisions with ships could be causing substantial whale shark deaths; but there was previously no way of monitoring this threat.

Scientists from 50 international research institutions and universities tracked the movements of both whale sharks and ships across the globe to identify areas of risk and possible collisions. Satellite tracked movement data from nearly 350 whale sharks was submitted into the Global Shark Movement Project, led by researchers from the MBA.

The team mapped shark ‘hotspots’ which overlapped with global fleets of cargo, tanker, passenger, and fishing vessels – the types of large ships capable of striking and killing a whale shark – to reveal that over 90 per cent of whale shark movements fell under the footprint of shipping activity.

The study also showed that whale shark tag transmissions were ending more often in busy shipping lanes than expected, even when they ruled out technical failures. The team concluded that loss of transmissions was likely due to whale sharks being struck, killed and sinking to the ocean floor.

University of Southampton PhD Researcher Freya Womersley, who led the study as part of the Global Shark Movement Project said: “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.”

Whale sharks are slow-moving ocean giants which can grow up to 20 metre in length and feed on microscopic animals called zooplankton. Whale sharks help regulate the ocean’s plankton levels and play an important role in the marine food web and healthy ocean ecosystems.

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