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of the freshwater fish on the Comoros are from secondary families, i.e. families of fish which can tolerate salt water. No primary families - fish families adapted to freshwater and intolerant of salt water - are native to the island, on account of the islands' oceanic origin and relatively recent geologic origins.

Marine ecology

Mayotte, the oldest island, is surrounded by a barrier reef, with extensive reefs and lagoons between the reef and the island. The reef and lagoon cover over 1,000 km²

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