David Fleetham / Ring-tailed cardinalfish (Ostorhinchus aureus), male protecting and incubating eggs in mouth, Philippines.

Fred Bavendam / Ring-tailed Cardinalfish (Apogon aureus) male protectively carrying a fertilized egg mass in his mouth while they incubate, Bali, Indonesia

Pascal Kobeh / Ring-tailed / Golden cardinalfish (Ostorhinchus aureus) male incubating its eggs in its mouth, Sulu sea, Philippines

Magnus Lundgren / Wild Wonders of China / Ocellated waspfish (Apistus carinatus) Shelter Island, Sai Kung archipelago, Hong Kong, China.

Georgette Douwma / Ring-tailed Cardinalfish (Apogon aureus) West Papua, Indonesia.

Linda Pitkin / Ring-tailed cardinalfish (Ostorhinchus aureus), Triton Bay, near Kaimana, West Papua, Indonesia

Georgette Douwma / Gorgonian / Sea whip coral (Ellisella ceratophyta) with Ring tailed cardinalfish (Apogon aureus) swimming in front, West Papua, Indonesia.

Alex Mustard / Longfin waspfish (Apistus carinatus) with its distinctive pectoral fins extended, on the sand at night. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Linda Pitkin / Ring-tailed Cardinalfish (Apogon aureus), hovering on coral Pantai Merah, Komodo, Indonesia.

Georgette Douwma / Ring-tailed cardinalfish (Apogon aureus) schooling in artificial reef. Mabul, Malaysia. Indo-Pacific.

Pascal Kobeh / Honeycomb moray (Gymnothorax favagineus) in a crack of the reef covered with soft corals (Dendronephthya ) with Ring-tailed cardinalfish (Ostorhinchus aureus), coast of Dhofar and Hallaniyat islands,...

Pascal Kobeh / Golden cardinalfish / ring-tailed cardinalfish (Apogon aureus) under a hard corail table (Acropora ), Daymaniyat islands, Oman. Gulf of Oman.