Puerto Mosquito is located on the southern shore of the island of Vieques, Puerto Rico. This bay is one of the brightest bays recorded in the world. The mysterious blue-green light in the water is created by single-celled bioluminescent dinoflagellates micro-organisms which thrive in an environment uniquely suited to their needs. These half-plant, half-animal organisms emit a flash of bluish light when agitated. At night the light can be bright enough to read a book by.