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Addu Atoll marine life

Despite the abundance of dolphins and whales in Addu atoll waters, the study of cetaceans there is in its infancy. Of 24-27 species that are likely to occur, 19 have been positively recorded to date. So there is still the chance of spotting something new! Of course, nothing can be guaranteed with wild animals, but you have an excellent chance of seeing: Spinner dolphin Stenella longirostris Bottlenose dolphin Tursiops truncatus Risso’s dolphin Grampus griseus Spotted dolphin Stenella attenuata Shortfin pilot whale Globicephala macrorhynchus


You have a reasonable chance of seeing: Blue whale Balaenoptera musculus Bryde’s whale Balaenoptera edeni Sperm whale Physeter macrocephalus Dwarf sperm whale Kogia simus Cuvier’s beaked whale Ziphius cavirostris Striped dolphin Stenella coeruleoalba Fraser’s dolphin Lagenodelphis hosei


And with luck you could see: Pygmy killer whale Feresa attenuata Melon headed whale Peponocephala electra False killer whale Pseudorca crassidens Killer whale Orcinus orca Dense-beaked whale Mesoplodon densirostris Rough-toothed dolphin Steno bredanensis.

There will be some opportunities for snorkelling (and diving for qualified divers) on the coral reefs. The most spectacular feature of these reefs is the abundant fish life. Over 347 species of fish have been recorded from the Addu atoll. You will be able to see over 130 species while snorkelling.
Flying fish are abundant and will be spotted regularly as we travel outside the atolls. If we are lucky we may see manta rays and whale sharks. Five species of turtle are known from the Addu atoll, and you have a chance of seeing three: green and hawksbill turtles in the atolls, and olive Ridleys out at sea.

Coral bleaching:

Dad CoralCoral bleaching refers to a process in which corals expel the algal cells (zooxanthellae) that normally live within their tissue. These algae give corals their characteristic brownish colour and once they have been expelled, the white skeleton shows through a coral’s transparent tissue, giving it a bleached white appearance. Bleached coral looks very similar to coral that has recently died, but can be distinguished (on close inspection) by the presence of small polyps and tentacles on the coral surface.

Coral bleaching can be caused by stressful environmental conditions such as extreme temperature, low salinity, extreme light and various toxins. However, large scale bleaching episodes are usually associated with unusually high sea temperatures. This relationship has led to the suggestions that coral reefs are showing early signs of stress due to global warming caused by green house gas emissions.

Dad CoralBleached corals are still alive and can recover fully if the stressful conditions are not too severe or prolonged. However massive coral mortality is a feature of many severe bleaching episodes. The events of 1982/83 and 1998 in particular resulted in wide spread mortality of some coral in some areas. Following milder bleaching events, most coral recover their health, but this may take several months, and can result in lower growth and abnormal reproduction for some time after normal colour has returned.

If you have any information on bleaching events, please mail us. We also welcome any documents or photographs on coral bleaching.

 

 

Addu Atoll coral bleaching records

 

 

 

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Addu Atoll

SEENU ATHELHE

S00°36.00'
E73°09.53'

Addu Atoll GPS Data

MAP OF ADDU

Addu Atoll Atoll Office
19020 , S. Hithadhoo
Tel: +960-6885003
Fax: +960-6885002

seenu@atolls.gov.mv

 

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