Mosquera, like may similar islets in the Galápagos, was formed by a volcanic uprising. The islet Mosquera that emerges from the sea between Seymour and Baltra island. A sandy bottom at 15-18 meters is scattered with curious garden eels and pelagic species as well as an underwater wall flowing downwards from the shallows into the deep. Keep an eye out for hammer head sharks and the garden eels that pop their heads out of the ground and disappear down their burrow as you approach! Also found in the area are black tip and white tip reef sharks, sea lions, turtles, barracudas, sting rays, eagle rays, mobula rays, Galápagos eels and a variety of reef fish and invertebrates.
Mosquera is home to one of the largest populations of Galápagos Sea Lions on the archipelago, and you will be able to watch their playful antics and admire their sense of relaxation as they sunbathe on the beach. There have been occasional sightings of Orca (Killer Whales) in the waters off Mosquera Island, probably attracted by the large number of Galápagos Sea Lions on which they prey.
Over the centuries it also attracted corals, and along with the rocks that form the islet this helped to capture the sand from the currents that flow between Baltra Island and North Seymour Island.
Mosquera Islet has a depth range between 6 – 27 meters (20 – 90 feet). Visibility averages 12 – 15 meters (40 – 50 feet). Surge and current is usually moderate to strong.