Marine life in Costambar features many Caribbean species found along the Dominican Republic coastal waters, including cetaceans ( dolphins, whales) and sirenians (manatees). Pelagic fish can be found when going fishing offshore ( Mahi, Wahoo, Tuna, Barracuda, Marlin, Sail fish, Jack fish).

Also lots of reef inhabitants such as Octopus, Tangs, Flounder, Sea snakes, Trunk fish, Eels, Stingray, Sea horse, Crabs, Snapper, Grouper, Angel fish, Butterfly fish and many more. This Costambar Beach Travel Guide will feature the most often found species so snorkelers and divers can have a guide to identify them when underwater. For more species not listed here please visit the Sosua Beach marine life guide.