Underneath the calm turquoise waters off eastern Thailand, a rapidly spreading disease is killing corals over vast stretches of the sea floor, and scientists fear it might be getting worse because of climate change.
Yellow-band disease — named for the color it turns corals before destroying them — was first spotted decades ago and has caused widespread damage to reefs in the Caribbean. There is no known cure.
It was detected for the first time off Thailand’s eastern coast last year, near the popular tourist city of Pattaya, and has already spread over about 240 hectares of the sea.
Photo: AFP
“I haven’t seen anything like this before,” Thai Department of Marine and Coastal Resources marine scientist Lalita Putchim said. “Everywhere we went we saw it, and we expect to see more of it as we go.”
Scientists believe overfishing, pollution and rising water temperatures because of climate change might be making the reefs more vulnerable to yellow-band disease.
The disease’s effects cannot be reversed, unlike the effects of coral bleaching.
“When the coral is infected with this disease, it just dies,” Lalita said.
The loss of corals could have a devastating effect on the ecosystem — the reef is “like a forest,” sustaining massive amounts of life, and its death could eventually impact humans, too, she added.
Thai scientists are hoping their investigation into this outbreak will help find a way to stop or cure yellow-band disease.
On one research trip near Samae San Island in Chonburi Province, Lalita and her team donned diving gear on a boat before heading underwater.
They photographed infected corals, taking measurements and photographs, while harvesting samples to study later.
Thai marine authorities are using social media to track reports of infected reefs, and have also asked the public to report any sightings of affected corals.
Thai researchers have also been aided by local volunteers, as well as business owner Thanapon Chaivanichakul, who collected underwater photographic evidence.
“I was shocked when I first saw it,” Thanapon said, using a series of expletives to describe the disease.
The disease is also a threat to the livelihoods of many in the area.
Choopan Sudjai, the owner of a sightseeing boat, relies on the income from tourists who come to see the area’s natural beauty — especially the coral reefs.
“Now that the coral has been infected and will be destroyed, what will we do in five years?” the 55-year-old said. “It feels as if our own home has been destroyed.”
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