Juergen Freund / Schooling Banggai cardinalfish in anemone tentacles. (Pterapogon kaudemi). Lembeh Strait, North Sulawesi, Indonesia

Chris Newbert / Yellow-striped Cardinalfish (Apogon cyanosoma) male with eggs in mouth, 40 feet deep, Solomon Islands

Gary Bell/ Oceanwide / Yellow-striped Cardinalfish (Apogon cyanosoma) sheltering in featherstar, Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Yellow-striped Cardinalfish (Apogon cyanosoma) male aerating eggs held inside mouth, Great Barrier Reef, Australia

Franco Banfi / Yellow-striped cardinalfish (Ostorhinchus / Apogon cyanosoma) and Narrow-lined cardinalfish (Archamia fucata) shoal amongst Sea urchins (Echinothrix diadema) spines, Lazi Pier, Dumaguete, East Negros...

Juergen Freund / Blackstriped cardinalfish (Apogon nigrofasciatus) with an isopod parasite attached to its back. North Raja Ampat, West Papua, Indonesia.

Sue Daly / Black spiny sea urchins (Diadema sp) with Humbug dascyllus (Dascyllus aruanus) and shoal of Yellow-striped cardinalfish (Apogon cyanosoma) Cebu, Philippines

Gary Bell/ Oceanwide / Yellow-striped Cardinalfish (Apogon cyanosoma) sheltering in featherstar, Great Barrier Reef, Australia