The Maldives have a range of different habitats including deep sea, shallow coast, and reef ecosystems, fringing mangroves, wetlands and dry land. There are 187 species of coral forming the coral reefs. This area of the Indian Ocean, alone, houses 1,100 species of fish, 5 species of sea turtle, 21 species of whale and dolphin, 400 species of mollusc, and 83 species of echinoderms. The area is also populated by a number of crustacean species: 120 copepods, 15 amphipods, as well as more than 145 crab and 48 shrimp species. Among the many marine families represented are pufferfish, fusiliers, jackfish, lionfish, oriental sweetlips, reef sharks, groupers, eels, snappers, bannerfish, batfish, humphead wrasse, spotted eagle rays, scorpionfish, lobsters, nudibranches, angelfish, butterflyfish, squirrelfish, soldierfish, glassfish, surgeonfish, unicornfish, triggerfish, Napoleon wrasse, and barracuda. These coral reefs are home to a variety of marine ecosystems that vary from planktonic organisms to whale sharks.
Sponges have gained importance as five species have displayed anti-tumor and anti-cancer properties. In 1998, sea-temperature warming of as much as 5 °C (9.0 °F) due to a single El Niño phenomenon event caused coral bleaching, killing two-thirds of the nation's coral reefs. In an effort to induce the regrowth of the reefs, scientists placed electrified cones anywhere from 20–60 feet (6.1–18.3 m) below the surface to provide a substrate for larval coral attachment. In 2004, scientists witnessed corals regenerating. Corals began to eject pink-orange eggs and sperm. The growth of these electrified corals was five times faster than untreated corals. Scientist Azeez Hakim stated: before 1998, we never thought that this reef would die. We had always taken for granted that these animals would be there, that this reef would be there forever. El Niño gave us a wake-up call that these things are not going to be there forever. Not only this, but they also act as a natural barrier against tropical storms, floods and tsunamis. Seaweeds grow on the skeletons of dead coral.
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