Nosy Be, there are no walls with coral reef but peaks that rise from sandy bottoms of about 20 meters. These benches rise from the seabed and are colonized by many species such as corals, specimens tridacna, sponges and of course the reef fish. Nosy Be Madagascar barriera corallina coral reef
On these plains are “beautiful coral garden” consisting of: sea fans, fusiliers, yellow and red snapper, trevally, Napoleon wrasse, grouper reef and deep, emperor angelfish, butterfly fish and angelfish South Africa.
Moreover parrot fish, trigger fish, nudibranchs, cleaner shrimps, sea cucumbers, crabs, spider crabs, lobsters, large clams, sponges vase and organ pipes.
Coral reefs deliver ecosystem services for tourism, fisheries and shoreline protection. Coral reefs are fragile, partly because they are sensitive to water conditions. They are under threat from excess nutrients (nitrogen and phosphorus), rising temperatures, oceanic acidification, overfishing (e.g., from blast, fishing, cyanide fishing, spearfishing on), sunscreen use, and harmful land-use practices, including runoff and seeps (e.g., from injection wells and cesspools).
Over 4,000 species of fish inhabit coral reefs. The reasons for this diversity remain unclear. Hypotheses include the “lottery”, in which the first (lucky winner) recruit to a territory is typically able to defend it against latecomers, “competition”, in which adults compete for territory, and less-competitive species must be able to survive in poorer habitat, and “predation”, in which population size is a function of postsettlement piscivore mortality. Healthy reefs can produce up to 35 tons of fish per square kilometer each year, but damaged reefs produce much less. Nosy Be Madagascar barriera corallina coral reef