David Fleetham / Galapagos Sea Lion (Zalophus californianus wollebacki) framed by a school of Black Striped Salema (Xenocys jessiae). Santa Cruz Island, Galapagos Islands, Equador.

Doug Perrine / Scuba diver films bait ball of Bigeye scad (Selar crumenopthalmus) Keauhou Bay, Kona, Hawaii, Hawaiian Islands. Central Pacific ocean. March 2010. Model released.

Michele Westmorland / Schooling fish around healthy reef system, Castle Rock, Komodo National Park, Indonesia.

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) group swimming in shallow turquoise sea, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) in shallow water gathering very close to shore, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) split level view of group hunting at dusk, Aldabra Atoll, Seychelles, Indian Ocean

Georgette Douwma / Oriental sweetlips (Plectorhinchus vittatus), Maldives, Indian Ocean

Georgette Douwma / Powder blue surgeonfish (Acanthurus leucosternon), large school swimming, Andaman Sea, Thailand

Pete Oxford / Shoal of Silky sharks (Carcharhinus falciformis) Jardines de la Reina National Park, Cuba

Pete Oxford / Horse eye trevally / jack (Caranx latus) Jardines de la Reina National Park Cuba, Caribbean

Juergen Freund / Schooling striped catfish (Plotosus lineatus). Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Green turtle (Chelonia mydas) with schooling Bigeye jacks / trevally (Cranax sexfasciatus). Sipadan Island, Sabah, Malaysia, June