Alex Mustard / Brandt's cormorant (Phalacrocorax penicillatus) hunts for a meal in a school of Pacific chub mackerel (Scomber japonicus) beneath an oil rig. Eureka Rig, Los Angeles, California, USA, September

Jeff Rotman / Close up of mouth of a Stoplight parrotfish (Sparisoma viride) Bahamas, Caribbean

Sue Daly,Sue Daly / Blue Maomao (Scorpis violaceus) shoal, Poor Knights Islands, New Zealand, February

Shane Gross / Stoplight parrotfish (Sparisoma viride) eating algae on coral reef. Eleuthera, Bahamas.

Shane Gross / School of Bermuda chub (Kyphosus Sectatrix). Image made off Eleuthera, Bahamas.

Richard Robinson / Beaked drummer fish (Kyphosus pacificus) North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific between Tonga and Fiji.

Alex Mustard / Brassy chub (Kyphosus vaigiensis) swimming through channel in coral reef at dusk. Alimatha Island, Vavuu Atoll, Maldives. Indian Ocean.

Linda Pitkin / Stoplight parrotfish (Sparisoma viride), male, biting coral rock (feeding on encrusting algae) Bonaire, Leeward Antilles, Caribbean.

Linda Pitkin / Queen parrotfish (Scarus vetula), terminal phase - male, on coral reef. Bonaire, Leeward Antilles, Caribbean.

Oriol Alamany / Silver Drummer (Kyphosus sydneyanus) fish off the coast of Neds Beach, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia, October 2012.

Claudio Contreras / Revillagigedo sea chub (Kyphosus lutescens), San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico, March.

Claudio Contreras / Revillagigedo sea chub (Kyphosus lutescens), San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico, March