Manihi offers three types of dives: the lagoon, the reefs that ring the island and the lagoon mouth drift dive. Each of these affords a different type of experience. The lagoons are home to sponges, oysters and shells such as lamis, terebra and mitra. Fish include damselfish, chromis, surgeonfish, groupers, butterflyfish and soldierfish. Also parrotfish, bluejacks, long-nosed emperors, rays and sharks.
The coral reefs that surround the island are rich in marine life. They harbor many colorful fish and crustaceans and are home to schools of sea perch, snappers, unicornfish and several species of jackfish. The deep waters are rich in tuna, Napoleon wrasse and the long-nosed unicornfish.
The pass which links the lagoon to the ocean is without doubt the richest area. Just outside the mouth of Tairapa Pass, along the gentle sloping reefs, are schools of fish too numerous to count. Due to the generally stronger currents, the underwater scenery and visibility is less impressive but is more than made up by the varieties and numbers of inhabitants. Manta rays favor these waters as they are rich in nutrients. The pass is also the favorite hunting grounds for sharks and barracudas.
There are more sharks in the Tuamotu than in the Society Archipelago. White-tipped, black-tipped and grey reef sharks are seen on every dive sometimes in great numbers. It is common to view schools of 25 or more 3-4 foot white-tipped sharks, their swirling masses when viewed from a distance resemble other types of schooling fish.
July is the time when the maramu (marble grouper) return to the Taumuto Archipelago to repeat an annual ritual enacted over millions of years. Marble groupers numbering in the thousands leave their normal habitats to congregate for the mating ritual. Groupers stay in the pass for eight days then move outside for a couple more. Although fish gatherings are seen throughout Polynesia, Manihi is particular impressive because the pass is so small and of the punctual nature of the event.
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