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Here is nice little video from the reef rescuers on Praslin. The reef rescuers say “During our coral nursery monitoring visits, we often encounter solitary or small groups of Humphead Parrotfish, Bolbometopon muricatum. These peaceful giants come for a free meal when we clean the nurseries from algae and barnacles. We feel fortunate to share our diving time with such charismatic megafauna.
The Humphead Parrotfish is the largest species of parrotfish in the world, with record size of up to 1.5 m long, weight over 50 kg and maximum lifespan of at least 40 years. The International Union for the Conservation of Nature (IUCN) Red List of Threatened Species, classifies the Humphead Parrotfish as threatened due to overfishing.”
And here is an article about the project from Deutche Welle: Nursing Indian Ocean coral reefs back to life