The Living Light: Mosquito Bay’s History and Ecological Magic

Tucked along the southern coast of Vieques, Puerto Rico , lies one of the world’s most breathtaking natural wonders —Mosquito Bay, home to the brightest bioluminescent waters on Earth. Recognized by the Guinness Book of World Record, this phenomenon is more than just a visual spectacle. It’s a living, breathing ecosystem filled with history, science, and unmatched beauty.

What Causes the Glow?

The glowing effect is created by microscopic plankton called dinoflagellates — specifically Pyrodinium bahamense. When disturbed by movement, these tiny organisms emit a radiant blue-green light, illuminating the water with every splash, paddle, or ripple. Under the right conditions — like a moonless night — it feels like kayaking through liquid stardust.

Why Mosquito Bay is So Unique

Mosquito Bay’s unmatched brilliance is the result of several rare environmental conditions: A narrow bay entrance, keeping water circulation minimalShallow depths and warm temperatures year-round Nutrient-rich water from surrounding red mangrove trees

These factors combine to create the perfect environment for dinoflagellates to thrive — in concentrations far greater than any other bio bay in the world.

A Glimpse into History

The name Mosquito Bay is believed to have originated from pirate Roberto Cofresí’s ship El Mosquito . Beyond folklore, the bay holds deep ecological and cultural importance for the island of Vieques. Today, it stands as a glowing symbol of the island’s natural magic and resilience.

Protecting a Fragile Wonder

Despite its brilliance, the bay’s ecosystem is incredibly delicate. Light pollution, chemical runoff, and overuse can threaten its long-term health. That’s why responsible, eco-friendly tours are essential for preserving this treasure. At Fun Brothers, we take this responsibility seriously — guiding visitors with care, respect, and a deep understanding of the bay’s ecosystem.

Experience the Magic with Fun Brothers

At Fun Brothers Vieques, we offer fully guided, eco-conscious tours in clear-bottom kayaks— giving you a front-row seat to nature’s light show while helping protect it for future generations.

• Tours run nightly

• Perfectly timed for ferry riders

• All gear included

• Knowledgeable, bilingual guides
  Ready to witness the glow?

Book your bioluminescent tour today and experience the living light of Vieques for yourself.