Fakarava, grey sharks hunting at night over the reef, prey in jaw

night shark night grey shark predation hunt hunting nervous nervosity Carcharhinus amblyrhynchos school group reef coral prey pass tuamotu south pacific ocean swarm polynesia oversea requin gris frénésie essaim groupe meute chasse chasser prédateur proie poisson corail récif passe outremer pacifique sud polynésie gopro tetamanu fakarava