Pink dolphins have been hit hard by overfishing, water pollution and numerous ferries and boats. TNS
Thanks to the peace and quiet brought on by the coronavirus pandemic, rare pink dolphins have returned to the seas around Hong Kong.
Sightings of the vulnerable Chinese white dolphin have risen by nearly a third - 30 per cent - since boat and ferry traffic was suspended in the region in March.
Scientists fear the species is in decline but say their research suggests the animals adapted more rapidly than expected to the quiet environment, offering a glimmer of hope for their populations.
Indo-Pacific humpback dolphins, also known as Chinese white dolphins or pink dolphins – reflecting their real colour – have been hit hard by overfishing, water pollution and numerous ferries and boats.
WWF says the population in the Pearl River Estuary, including Hong Kong, is believed to be around 2,500, but falling numbers of young could reduce numbers in future.
Scientists took advantage of the lockdown to drop microphones from a boat and use drones to monitor the dolphins.
Their research suggests the animals adapted quickly to the more quiet environment and now the population could start to bounce back.
“What we have noticed since the ferries have stopped in this area is dolphins we hadn’t seen for four, five, six years are back in the Hong Kong habitat, so it seems very quickly that the dolphins have come back into this waterway,” said marine scientist Lindsay Porter.
“Normally this entire area would be full of fast ferries taking people from Hong Kong to Macau and back again.
“Since the Covid pandemic started in Macau and a lot of areas have had restricted travel, the fast ferries have stopped. And these waters have become very, very quiet.”
Ms Porter, who has researched dolphins for three decades from Hong Kong, added: “I sometimes feel that we’re studying the slow demise of this population, which can be really sad.”
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