Georgette Douwma / Coral (Goniopora sp) polyps extended. Lembeh Strait, North Sulawesi, Indonesia.

Georgette Douwma / Coral (Goniopora sp) polyps extended. Lembeh Strait, North Sulawesi, Indonesia.

Doug Perrine / Plate and Pillar coral (Porites rus) and Cauliflower coral (Pocillopora meandrina) bleached by warm sea temperatures during 2015 El Nino event, Honaunau Bay, Kona, Hawaii, USA.

Alex Mustard / Dome coral (Porites nodifera) pinnacle or bommie surrounded by fish, including Scalefin anthias (Pseudanthias squamipinnis), with diver Fury Shoal, Egypt. Red Sea.

Alex Mustard / Chocolate-dip chromis (Chromis dimidiata) male over out of focus hard coral (Porites nodifera). Sha'ab Claudia, Fury Shoal, Egypt. Red Sea

Georgette Douwma / Extended polyps of the Hard coral (Goniopora sp) Lembeh, Sulawesi, Indonesia.

Alex Mustard / Colony of Finger coral (Porites porites) on a shallow coral reef. Cayman Brac, Cayman Islands. Caribbean Sea.

Georgette Douwma / Porites coral, stony coral boulders. Egypt, Red Sea.

Pascal Kobeh / Diver near barrel sponge (Xestospongia testudinaria), hard coral (Porites sp) and red whip coral (Ctenocella sp), Walindi, Papua New Guinea, Bismarck Sea.

Pascal Kobeh / Debris of dead corals (Acropora and Porites ) probably due to the bleaching of 1998 an El Nino year which killed a large amount of Maldive corals, Maldives. Indian Ocean.

Pascal Kobeh / Diver on top of a flatreef with hard corals and Acropora tables (Acropora and Porites ) and reef fish, Maldives. Indian Ocean. March 2013.

Pascal Kobeh / Diver on a reef with hard corals (Porites) and Table corals (Acropora) and Magnificent sea anemone (Heteractis magnifica) with Maldives anemonefish (Amphiprion nigripes) Maldives. Indian Ocean. March...