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A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate . [ 1 ] Most coral reefs are built from stony corals , whose polyps cluster in groups.
The Great Barrier Reef is the world's largest coral reef system, [1] [2] composed of over 2,900 individual reefs [3] and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi).
The densest and most spectacular reefs, along with the highest water clarity, are found to the seaward of Key Largo (in and beyond John Pennekamp Coral Reef State Park) and Elliott Key (the northernmost 'true' Florida Key) where the two long keys help protect the reefs from the effects of water exchange with Florida Bay, Biscayne Bay, Card ...
This coral reef has more biodiversity than in any of the waters of India. It is one of only a few pristine systems in Sri Lanka. Belize Barrier Reef: Belize: This is the second biggest coral reef system on Earth, the largest being the Great Barrier Reef.
The Global Coral Reef Monitoring Network (GCRMN) reported in 2021, that the East Asian Seas region, which includes the Coral Triangle, was the only region where coral cover was substantially greater in 2019 (36.8%) as compared to 1983 (32.8%), which is the year that the earliest data was collected.
The coral reef has been an integral part of Southeast Asian communities for thousands of years. According to Tiffany Adams of Hong Kong, "With the higher demands on the coral reef to produce for the increasing population and the introduction of the world market in the last fifty years, overexploitation has become the most prevalent threat." The ...
Corals and coral reefs are endangered due to global warming, which results in coral bleaching. According to UNESCO, the coral reefs in all 29 reef-containing World Heritage sites would cease to ...
Coral reef fish are fish which live amongst or in close relation to coral reefs. Coral reefs form complex ecosystems with tremendous biodiversity . Among the myriad inhabitants, the fish stand out as colourful and interesting to watch.