Puerto Rican authorities are limiting visits to a bioluminescent bay on the island of Vieques whose glow has been fading.

The Mosquito Bay park, a major tourist attraction, will be open to visitors just three days a week for at least two months as scientists try to determine the cause of the diminishing luminescence, the Department of Natural Resources said.

While studies are already in progress, no concrete answers have emerged, Mark Martin, of the Vieques Conservation and Historical Trust, told Efe.

“We have data, but we will not offer a theory. This has shown itself to be a very charged issue and we prefer to wait for scientific results,” he said. see more http://latino.foxnews.com/latino/news/2014/05/06/puerto-rico-limits-access-to-glowing-bay/