Thirty-two of the short-finned pilot whales came ashore during high tide early Wednesday in Probolinggo, East Java province.
“At first there were just one or two whales swimming near the shore, and the nature of whales is that if they are sick they will come near the shore,” Dedy Isfandi, the head of the local maritime and fisheries office, told AFP.
“But whales have such high social interaction – when one fell ill, they approached the sick one to swim back to sea ... when the tide fell all of them were trapped,” Isfandi added.
Hundreds of local fishermen and government officials tried to take them back out to sea overnight, but in the morning eight whales had returned to shore and died, Isfandi said.
About 23 others were already out at sea while one disoriented whale was accompanied by rescuers to make sure it did not return to shore.
Rescuers used tarps to wrap around the beached whales and pull them out to sea, while swimmers plunged into the water to drive others out of the area.
Vets and scientists conducted autopsies on the dead whales to find out why they were stranded. Fishery officials said it could be due to turbulent waters in the Indian Ocean or that they had eaten something poisonous.
Over the last decade or so, whale sharks and orcas have also been found stranded in the area, Isfandi said.
The International Union for Conservation of Nature said there was insufficient data to classify the risk of extinction of short-finned pilot whales, which are found in warm temperate to tropical waters.
Eight pilot whales dead in mass stranding in Indonesia
16 June 2016
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Eight pilot whales have died after a mass stranding on the coast of Indonesia
