Guiness Book of World Records 2008.

Living Light

The Mosquito Bioluminscent Bay on the Island of Vieques, Puerto Rico is the most bioluminescent in the World.It contains up to 160,000 microscopic dinoflagelates per liter of water.

When agitated, these microscopic organisms (Pyrodinium bahamense or swirling fire) reacts emitting a blue-green light for about a decimal of a second.

There are other bioluninescent bays around the island, but the Mosquito Biobay is the one that shines with the most intensity, its shallow and small entrance from the sea impedes the waves from washing away the dinoflagellates; and the mangrove trees, with their decomposition process, provides abundant food for the micro-organisms.

Please do not leave Vieques, Puerto Rico without taking a tour of this magnificent and magical natural wonder, it will be a memory to remember for a lifetime.

In the waters of Mosquito Bay there are organisms named Pyrodinium bahamense, Dinoflagellates (dinos). These "dinos" are responsible for this amazing natural phenomenon. When the "dinos" come into contact with another organism or shaken they produce a bright burst of blue light.

Mosquito Bay is the perfect environment for this "dinos". The Bay is small and shallow and the mouth of the bay is small, so the bright tiny organisms are trapped and protected in the bay, making it very, very bright.

The mangroves surrounding the bay provide the perfect nutrition for the Pyrodinium bahamense. Any changes in the delicate ecosystem can diminish the healthy balance of the bay.

Bioluminescent Bay Tour Guides in Isla de Vieques, Puerto Rico

Travesìas Isleñas Yaureibo

We are bilingual and naturally from Vieques. We will make you feel right at home with friendly professional service.

Click here for more information on Travesias Yaureibo

Things you can do to save the Vieques BioBay

Click here for things you can do to helppreserve the Bio Bay in Vieques during your visit

Note: Choose a tour operator that is conscious about the health and protection of the Bio Bay. Everyone can make a difference.

More information on the Bioluminescent (Bio) Bay in Vieques, Puerto Rico

"Illuminated Vieques A guided tour on a motorboat isn't the way most romantic evenings begin, but once you slip your body into Mosquito Bay, a bioluminescent lagoon off the island of Vieques, you'll have forgotten the exhaust fumes. Millions of "stars" (actually, they're microscopic organisms in the water) light up with a stunning blue-white glow, and scatter with every splash you make. Spielberg couldn't ask for better special effects."