Constantinos Petrinos / Yellow stripe clingfish (Diademichthys lineatus) living in association with the Fire Urchin (Astropyga radiata) Lembeh Strait, North Sulawesi, Indonesia.

Christophe Courteau / Shore clingfish / Cornish sucker (Lepadogaster lepadogaster) portrait, Brittany, France, January.

Constantinos Petrinos / Yellow stripe clingfish (Diademichthys lineatus) living in association with the Fire Urchin (Astropyga radiata) Lembeh Strait, North Sulawesi, Indonesia.

SCOTLAND: The Big Picture / Clingfish amongst gravelly maerl in no take zone, South Arran Marine Protected Area, Isle of Arran, Scotland, UK, August.

SCOTLAND: The Big Picture / Clingfish amongst gravelly maerl, South Arran Marine Protected Area, Isle of Arran, Scotland, UK, August.

Pascal Kobeh / Feather star clingfish (Discotrema crinophila) living in crinoid, New Caledonia, Pacific Ocean. This fish perfectly mimics its host and has modified pelvic fins that act as suction cups for attachment...

Christophe Courteau / Shore clingfish / Cornish sucker (Lepadogaster lepadogaster) dorsal view. Brittany, France, January.

Christophe Courteau / Shore clingfish / Cornish sucker (Lepadogaster lepadogaster) portrait, Brittany, France, January.

Alex Mustard / 2020VISION / Small-headed clingfish (Apletodon dentatus) on kelp frond, Loch Carron, Scotland, UK, April

Alex Mustard / Stippled clingfish (Gobiesox punctulatus) attached to a piece of wood in shallow water, West Bay, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Juergen Freund / Urchin clingfish (Diademichthys lineatus) North Raja Ampat, West Papua, Indonesia.

Juergen Freund / Urchin clingfish (Diademichthys lineatus). North Raja Ampat, West Papua, Indonesia.