#1 Biobay in the world

Located on the southern shore of Vieques Island, Mosquito Bay was declared to be the brightest bioluminescent bay by the Guinness Book of World Records and continues to hold the record. 


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Best biobay in the world.Remember you need to sleep in Vieques to take the tour.


Puerto Mosquito (Mosquito Bay) is located on the southern shore of the island of Vieques, one of the islands of Puerto Rico.  This bay is often referred to as “magical”, those blessed with the opportunity to experience it always agree.  The bioluminescent bay in Vieques was officially declared the brightest in the world by Guinness Book of World Records in 2008.  Hurricane Maria caused much destruction on the island, it sadly disrupted the delicate balance of the bay, the beloved Mosquito Bay went dark.  To everyone’s surprise the bioluminescent bay not only recovered, but it is also brighter than it ever was in the past.


Why is the #1 in the world?


Don’t leave Isla de Vieques without taking a tour of this magnificent and magical natural wonder. It will be a magical, priceless memory to remember for a lifetime.   The bio bay is best experienced during a “New Moon” phase, so we’ve included an interactive moon phase calendar below to help you plan your trip accordingly.  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.

More About Mosquito Bay, Vieques

Mosquito Bay was officially declared the brightest Bio Bay by the Guinness Book of World Records in 2008. Situated in Vieques, a small island off the east coast of Puerto Rico, this is a must see attraction on your next trip to Puerto Rico. Although Vieques is a bit off the beaten path, there are tour options available that depart from San Juan and directly from the island. On all tours you will discover the magical glow from the bioluminescence and learn more about the dinoflagellates that populate the water.

Explore the area with a local guide that will show you the way around the bay by kayak and take you to the best areas to see the glowing water. Trusted tour operators have the knowledge and know how to guarantee an incredible experience while visiting Mosquito Bay.


How to Visit the Bioluminescent Bay in Mosquito Bay in Vieques, Puerto Rico

Most things that sound too good to be true usually are. When we first heard about the bioluminescent bay in Vieques, we weren’t sure what to expect. The whole concept sounded unreal. A glowing bay? What makes it glow? Is it radio active or something? Is it really as bright as it is in the pictures?

While most people who visit Puerto Rico tend to stick around San Juan, we’ve found that most opportunities for adventure happen outside of the the capital. Keep reading to find out how you can experience this magical place too.

Booking a Bio Bay Tour

There are multiple tour companies that will show you the Bio Bay. In case we are full , here you have more options. 

We took a tour of the bio bay in vieques with Bieke Eco-Trips, but they’re not the only option available.
  • Melaya’s Tours 

  • Abe’s Biobay Kayak Tour 

  • Taino Aqua Adventures 

  • Island Adventures 

  • Jak Water Sports 

  • Vieques Adventure Company 


Bio Bay Tours generally cost $45-60 USD per person.

When to See the Bioluminescence

In order to truly appreciate this natural phenomenon you have to see it when it’s pitch-black out. Unless you have a very special camera for nighttime photography, you can forget about capturing the bioluminescence on film. In fact, most bio bay ads you see online include some super fake photoshopped photos for this very reason. Cameras just can’t do it justice. So make sure you plan your trip for a night when there is a new moon, or at least within a day or two of a new moon to see the glow in all it’s glory. This resource here will help you do just that.