Exploring Bioluminescent Bays

In essence, a bioluminescent bay (or biobay) is a rare and fragile ecosystem. There is bioluminescence all over the world; however, few places classify as a biobay. Biobays are formed by microscopic single-cell organisms called dinoflagellates. When these organisms get agitated (i.e., when any object in the water splashes through), they release energy in the form of light. Consequently, they glow, illuminating anything that comes in contact with them, such as fish, the oars of a canoe, or people.

What Makes the Vieques Biobay Special

There are numerous reasons why Mosquito Bay in Vieques is recognized as one of the most bioluminescent bays in the world. More specifically, the bay has a very narrow opening to the sea, providing excellent protection from winds and tides. This environment allows the dinoflagellates to thrive. With over 700,000 organisms per gallon of water, no other biobay comes close to this extraordinary concentration. Additionally, the mangroves in the area serve as a vital source of nutrients for these organisms, and the temperate climate further contributes to their well-being. Finally, conservation efforts have preserved Mosquito Bay, prohibiting motorboats from entering these waters.

Swimming in Dinoflagellate-Infested Waters

For a long time, visitors were encouraged to immerse themselves in the water and literally glow in the dark, as the dinoflagellates sparked into action upon contact with swimmers. While this was once a breathtaking experience, conservationists are now recommending caution. Even if you do not swim, you will still be enchanted by darting fish appearing like streaks of lightning, the oars of your canoe revealing neon green splashes, and your hand glowing a brilliant green when dipped in the water. It is truly a beautiful and ethereal experience.

Kayaking vs. Boating

There are only two methods to explore the biobay: by kayak and by electric pontoon boat. The kayak ride provides a unique opportunity to navigate the bay’s mangrove tunnels and enjoy the full splendor of a nighttime excursion; however, it may be physically demanding. For those seeking a more leisurely experience, the pontoon boat offers a relaxed way to enjoy the biobay’s beauty. For kayaking, we recommend Abe’s biobay tour and Island Adventures.

Best Time to Go

If you can, try to visit during a new moon. A dark night filled with stars creates ideal conditions for witnessing the beauty of the biobay. If rain begins to fall, don’t lament your luck; the raindrops on the water surface resemble emeralds dancing across the bay.