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Wikipedia: Coral reefs are aragonite structures produced by living animal colonies, found in marine waters containing few nutrients. In most healthy reefs, stony corals are predominant. Stony corals are built from colonial polyps that secrete an exoskeleton of calcium carbonate.
![[Coral reefs in Papua New Guinea]](http://images.ookaboo.com/photo/s/Coral_reefs_with_fishes_s.jpg "Coral reefs in Papua New Guinea")
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![[Island with fringing reef off Yap, Micronesia]](http://images.ookaboo.com/photo/s/Mvey0290_s.jpg "Island with fringing reef off Yap, Micronesia")
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 from Magnus_Manske |
 from Dodo |
![[Most coral polyps are nocturnal feeders]](http://images.ookaboo.com/photo/s/Sea_Cotton_s.jpg "Most coral polyps are nocturnal feeders")
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![[Ancient coral reefs]](http://images.ookaboo.com/photo/s/Ancient_coral_reefs_s.jpg "Ancient coral reefs")
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 from laszlo-photo |
from Sturm |
![[Reefs in the Maldives]](http://images.ookaboo.com/photo/s/Maldives_small_island_s.jpg "Reefs in the Maldives")
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![[Diagram of a fringing coral reef.]](http://images.ookaboo.com/photo/s/Coral_reef_diagram_s.jpg "Diagram of a fringing coral reef.")
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from B166-er |
from Salleman |
![[The colour of corals depends on the type of zooxanthella they host]](http://images.ookaboo.com/photo/s/Multy_color_corals_s.jpg "The colour of corals depends on the type of zooxanthella they host")
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![[Close up of polyps arrayed on a coral, waving their tentacles]](http://images.ookaboo.com/photo/s/Coral_detail_s.jpg "Close up of polyps arrayed on a coral, waving their tentacles")
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from Mila Zinkova |
from pakmat |
![[[[Shoaling and schooling]](http://images.ookaboo.com/photo/s/Prionurus_laticlavius_s.jpg "[[Shoaling and schooling")
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![[Green turtle]](http://images.ookaboo.com/photo/s/Green_turtle_John_Pennekamp_s.jpg "Green turtle")
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from laszlo-photo |
from Dschwen |
![[Giant clam]](http://images.ookaboo.com/photo/s/Red_sea_reef_3627_s.jpg "Giant clam")
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![[Table coral]](http://images.ookaboo.com/photo/s/FFS_Table_bottom_s.jpg "Table coral")
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from Hgrobe |
from Telim tor |
![[Soft coral, cup coral, sponges and ascidians]](http://images.ookaboo.com/photo/s/Nephtheidae_komodo_s.jpg "Soft coral, cup coral, sponges and ascidians")
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![[Tube sponges attracting small reef fish]](http://images.ookaboo.com/photo/s/Callyspongia_sp_28Tube_sponge_29_s.jpg "Tube sponges attracting small reef fish")
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from Nhobgood |
from Nhobgood |
![[Pillar coral]](http://images.ookaboo.com/photo/s/PillarCoral_s.jpg "Pillar coral")
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![[Spiral wire coral]](http://images.ookaboo.com/photo/s/Cirripathes_sp_28Spiral_Wire_Coral_29_s.jpg "Spiral wire coral")
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from Ed g2s |
from Nhobgood |
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