Richard Robinson / Helen's triplefin (Ceratobregma helenae) at Vautoa Ono, Lau Island Group, Fiji.

Alex Mustard / Rhinoceros triplefin (Helcogramma rhinoceros) male displaying his dark mating colours and lifts his extended snout to impress a more drably coloured female as she lays eggs in their nest. Seraya, Tula...

Alex Mustard / Portrait of a striped triplefin (Helcogramma striatum) sitting on top of a coral. Menjangan Island, Bali, Indonesia. Java Sea

Claudio Contreras / Garibaldi (Hypsypops rubicundus) and Giant kelpfish (Heterostichus rostratus) among Southern sea palm (Eisenia arborea), San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja Ca...

Claudio Contreras / Giant kelpfish (Heterostichus rostratus), San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja California, Mexico, May

Claudio Contreras / Giant kelpfish (Heterostichus rostratus), San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja California, Mexico, May

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), Angel de la Guarda Island Protected Area, Gulf of California (Sea of Cortez), Mexico, July

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), Angel de la Guarda Island Protected Area, Gulf of California (Sea of Cortez), Mexico, July

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), Salsipuedes Island Protected Area, Gulf of California (Sea of Cortez), Mexico, July

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), Salsipuedes Island Protected Area, Gulf of California (Sea of Cortez), Mexico, July

Franco Banfi / Blue lined blenny (Helcogramma striata) Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Franco Banfi / Neon triplefin (Helcogramma striata) Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines