BAN KO SAMAESAN, Thailand: 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 may be getting worse because of climate change.
Yellow-band disease – named for the colour 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.
But it was detected for the first time off Thailand’s eastern coast just last year, near the popular tourist city of Pattaya, and has already spread over roughly 240 hectares of the sea.
“I haven’t seen anything like this before,” said marine scientist Lalita Putchim, of Thailand’s Department of Marine and Coastal Resources.
“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 may be making the reefs more vulnerable to yellow-band disease.
The disease’s impact 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 impact 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.