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

Sue Daly / Black faced blenny (Tripterygion delaisi) female and male Sark, British Channel Islands, July.

Richard Robinson / Gridled wrasse (Notolabrus cinctus) surrounded by Oblique-swimming triplefin (Forsterygion maryannae) in Dusky Sound, Fiordland National Park, New Zealand.

Richard Robinson / A diver is surrounded by thousands of oblique-swimming triplefins (Forsterygion maryannae ) on the Wreck of the Waikare, a steel screw steamer that sunk in 1910 at Stop Island, Dusky Sound, Fiordland...

Pascal Kobeh / Blackfin triplefin (Helcogramma fuscopinna), coast of Dhofar and Hallaniyat islands, Oman. Arabian Sea.

Pascal Kobeh / Blackfin triplefin (Helcogramma fuscopinna), coast of Dhofar and Hallaniyat islands, Oman. Arabian Sea.

Sue Daly / Black faced blenny (Tripterygion delaisi) Guillaumesse, Sark, British Channel Islands.

Sue Daly / Black faced blenny (Tripterygion delaisi) Guillaumesse, Sark, British Channel Islands.

Franco Banfi / Black-faced blenny female (Tripterygion delaisi) Ischia Island, Italy, Tyrrhenian Sea, Mediterranean

Wild Wonders of Europe / Banfi / Male Yellow triplefin blenny (Tripterygion delaisi) Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Ross and Diane Armstrong / Blue-eyed Triplefin (Notoclinops segmentatus) on coral, Poor Knights Islands, New Zealand