Juergen Freund / Elephant ear sponge (Ianthella basta) with a Triplefin blenny resting on it, West New Britain, Papua New Guinea.

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

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

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

Chris Newbert / Triplefin (Helcogramma sp) on Sea Fan (Muricella sp) 80 feet deep, Solomon Islands

Chris Newbert / Red-finned Triplefin (Helcogramma gymnauchen) portrait, 30 feet deep, Solomon Islands

Roberto Rinaldi / A triplefin blenny (Tripterygiidae) swimming across coral, Belize

Roberto Rinaldi / Triplefin blenny (Blenniidae sp.) fish hiding among red coral (Anthozoa sp.), Belize

Alex Mustard / Striped triplefin (Helcogramma striatum) resting on the underside of a bleached Leather coral (Sarcophyton sp.). The bleaching occurred as a result of elevated water temperatures in late 2022, due to...

Alex Mustard / RF - Striped triplefin (Helcogramma striata) resting on Pink sponge (Chalinula sp.), Raja Ampat, West Papua, Ceram Sea, Pacific Ocean. (This image may be licensed either as rights managed or royalty f...

Alex Mustard / Maldives triplefin (Helcogramma maldivensis) resting on a yellow / green sponge, South Ari Atoll, Maldives, Indian Ocean.

Magnus Lundgren / Striped triplefin (Helcogramma striatum), portrait, Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Magnus Lundgren / Striped triplefin (Helcogramma striatum), close up, Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Alex Mustard / Yellow male Black faced blenny (Tripterygion delaisi) displaying, Swanage, Dorset, UK. English Channel.

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), San Rafaelito Lighthouse Islet, Balandra National Protected Area, near La Paz, Gulf of California (Sea of Cortez), Mexico, September

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), San Rafaelito Lighthouse Islet, Balandra National Protected Area, near La Paz, Gulf of California (Sea of Cortez), Mexico, September

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), Puerto Escondido, Loreto Bay National Park, Gulf of California (Sea of Cortez), Mexico, August

Claudio Contreras / Roughhead triplefin blenny ( Enneanectes boehlkei ), Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico, May

Claudio Contreras / Roughhead triplefin blenny ( Enneanectes boehlkei ), Xkalac Reefs National Park, Caribbean region, Mexico, May

Alex Mustard / Triplefin (Tripterygion delaisi) showing its breeding colours of a dark face and yellow body. Swanage, Dorset, England, United Kingdom. English Channel. North East Atlantic

Georgette Douwma / Tropical striped triplefin (Helcogramma striatum) on Pink sea squirts (Didemnidae). Derawan Islands, East Kalimantan, Indonesia.