Fakarava, Frenzy of grey sharks at night over the reef

frenzy night shark 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