Fakarava, convict tang fishes spawning while grey sharks hunting, 2K7

convict tang spawning grey shark hunting reproduction surgeon fish sperm releasing eggs mating shark frenzy grey eat pass undersea Fakarava Tetamanu ocean current school tropical Polynesia banc poisson chirurgien bagnard fraie sperme gamète laitance requins gris frénésie manger passe courant ocean Pacifique sous marin Polynésie group nager convict surgeon fish