Alex Mustard / Whitetip shark (Carcharhinus longimanus) head on beneath the surface. Rocky Island, Egypt. Red Sea

Claudio Contreras / Bull shark (Carcharhinus leucas) Playa del Carmen, Caribbean Sea, Mexico, January.

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by pilotfish (Naucrates ductor) as it cruises beneath the surface of the Red Sea, close to Little Brother Island. The Brothers Islands, Egy...

Chris & Monique Fallows / Blacktip shark (Carcharhinus limbatus) feeding on sardines (Sardinops ocellatus ) East London, South Africa

Chris & Monique Fallows / Ragged tooth shark (Carcharias taurus) showing teeth, De Hoop, South Africa.

Nick Garbutt / Baby Spot-tail Sharks (Carcharhinus sorrah) on sale in fish souk (market) all caught in the Persian Gulf and many bound for markets in Asia. Sharjah, United Arab Emirates. April 2013

Norbert Wu / Oceanic White-tip Shark (Carcharhinus longimanus) with Pilot Fish (Naucrates ductor), Bahamas, Caribbean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) swimming in shallow crystal clear water, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) fins at frenzied surface, Aldabra Atoll, Seychelles, Indian Ocean

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

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus), Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus) approaching Grey heron (Ardea cinerea) in shallow water, Aldabra Atoll, Seychelles, Indian Ocean