The reason of coral reef is endangered is due to:
- Over-fishing: Is the most serious threats to the ecosystems. This affects the ecological balance of the coral reef communities, warping the food chain.
- Destructive Fishing Practises: These include cyanide fishing, blast or dynamite fishing, and bottom trawling.Bottom-trawling is one of the greatest threats to cold-water coral reefs.
- Careless Tourism: Careless boating, diving, snorkeling, and fishing happens around the world, with people touching reefs, stirring up sediment, collecting coral, and dropping anchors on reefs.
- Coral mining: Live coral is removed from reefs for use as bricks, road-fill, or cement for new buildings. Corals are also sold as souvenirs to tourists and to exporters who don't know or don't care about the longer term damage done, and harvested for the live rock trade.
- Climate Change: Corals cannot survive if the water temperature is too high. Global warming has already led to increased levels of coral bleaching, and this is predicted to increase in frequency and severity in the coming decades.
- Boat and Shipping: traffic physical destruction of reefs
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