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2008 mass whale stranding attributed to sonar mapping, researchers say
by Staff Writers
Antananarivo, Madagascar (UPI) Sep 26, 2013

disclaimer: image is for illustration purposes only

A mass whale stranding in Loza Lagoon off Madagascar on 2008 has been attributed to high-frequency mapping sonar systems, researchers said.

An investigatory team determined the stranding of 100 melon-headed whales was caused by an echo-sounder system operated by a survey vessel, Science Recorder reported Thursday.

When the stranding occurred, the Wildlife Conservation Society worked with an international stranding team to help return live whales to the ocean and conducted necropsies to help determine what led to such a large number of whales to become stranded.

The final report, issued Wednesday, said the incident was the first mass stranding attributed to high-frequency mapping sonar systems. The findings also said there were serious concerns about the noise created by sonar machines and their impact on marine life.

"The potential for behavioral responses and indirect injury or mortality from the use of similar MBES [multi-beam echo-sounder systems] should be considered in future environmental assessments, operational planning and regulatory decisions," the report said.


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Sonar mapping for oil killed Madagascar whales: study
Washington (AFP) Sept 26, 2013
A noisy technology that blasts high-frequency sounds below water to map the ocean for oil probably caused the deaths of 75 melon-headed whales off Madagascar, experts said Thursday. An independent panel of scientists found that sonar surveying by ExxonMobil in late May 2008 led to the sudden displacement of around 100 whales, of which at least three-quarters died. "This is the first kno ... read more

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