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This Table coral (Acropora cytherea) is showing signs of coral bleaching and disease.  The brown parts are healthy, the white parts are where the coral has expelled its healthy symbiotic algae leaving only the animal exoskeleton.  Possibly due to pollution, disease, ocean acidification or global warming.  Location is Ko Haa Islands, Andaman Sea, Krabi, Thailand.
Corals in the form of tentacles on a reef.
close up of Halimeda opuntia on a coral on a beach. This species is also called Prostrate Cactus Alga, Watercress Alga and Money Plant.
Underwater environment beneath the ocean surface with seaweed and kelp beds.
Shallow corals have turned into rubble in the shallows of Indonesia. Rising sea temperatures, ocean acidification, Crown of Thorns sea stars, pollution, and over-fishing are major threats to reefs.
An aerial view of a narrow shoal at low tide on the Atlantic coast.
Macro shot of bright cyan-colored crystals contrasting with a dark rocky terrain.
The Mediterranean seagrass (Posidonia oceanica) and the invasive red seaweed (Asparagopsis armata) in La Ciotat (South of France).
Tropical seascape with coral underwater and colorful sunrise, split view over-under water surface
The genus Acropora has the largest number of species of all the hard corals, and they are among the important building blocks of a reef. Larger colonies are more commonly seen on undisturbed and remote reefs. Many species grow into branching forms that give rise to common names like \
Aerial view Great Barrier Reef from sky out of air plane in Australia
Tropical fish swimming around each other in Negril, Jamaica
Yellow Feather star ( Crinoid ) - Sea lily on Maldives
Blue Sea Water and Tropical Fish. Tropical underwater sea fish. Philippines. Virtual Reality 360.
UNDERWATER, CLOSE UP: Coral reef near the island of Himmafushi is destroyed by climate change. Global warming is damaging the tropical marine life in Asia. Devastated exotic coral reef in the Maldives
Bunte Unterwasserwelt
Branching coral colony in the clear seawater
At this very healthy reef at Karang Huisman, a sea mountain near Tayandu Island, large Acropora Table Corals and Porites Corals dominate the scenery. \nPorites is one of the most common scleractinian coral species on Indonesian reefs. The average of coral growth rates ranged from 0.8-1.2 cm/year. So this coral must be very old. \nKarang Huisman, Tayandu Island, Indonesia, 5°28'41.7221 S 132°13'21.3085 E at 11m depth
An image of several large rocks covered in thick green sea grass at low tide.
Soft coral reef system in the pacific ocean
Cabrera (14) poseidonia
This image shows the devastating effects of Coral bleaching as a result of the Global Warming.  These corals are broken and dead due to the ocean temperature rising and causing loss of endosymbiotic algae.  Here we see an example of the underwater effects on this coral reef ecosystem being totally destroyed.  The location is Phi Phi, Andaman Sea, Krabi, Thailand.  Sony mirrorless camera, with underwater housing and lighting used.
The diving on Socotra island in Indian ocean, Yemen
Aerial view of coral reef
Snorkeling on a tropical coral reef
The landscape of the beaches of Bali, Pulo Aceh at low tide near dusk with colored reefs and sunset
Sea Life Underwater Rocks Sunlight, Underwater Life
Next to Tayandu Island there are Karangs, shallow areas that reach a few meters below the surface. They are full of life. Table Acropora exceeded three metres in size here, reaching up to four metres.\nThis colony was badly damaged. Damage happens often by mix of storms, earthquakes and destructive fishing practices. \nThis colony has a good overgrowth of dead portions, a high lesion repair. The white edges are the growth zones.\nIn 2023, when this photo was taken, the stress resistance, recovery, and overall reef health and resilience potentials of this coral community were all high.\nKarang Huisman, Tayandu Island, Indonesia, \n5°28'41.72 S 132°13'21.31 E at 11m depth
Turtlegrass (Seagrass) on Coral Reef off Marathon, Florida Keys, Florida
Sea grass
Free Images: "bestof:What happens to a coral reef after a mass bleaching event? Often, algae overgrows the dead corals, dramatically impacting the reef ecosystem, like on this"
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