Alex Mustard / Staghorn coral (Acropora cervicornis) growing on a coral reef and creating a home for Blue chromis (Chromis cyanea). East End, Grand Cayman, Cayman Islands. British West Indies. Caribbean Sea

Pascal Kobeh / Blue chromis (Chromis cyanea) with attached parasitic Isopod (Anilocra sp) female feeding on blood, in reef. Bahamas.

Pascal Kobeh / Blue chromis (Chromis cyanea) with parasitic Isopod (Anilocra sp) female feeding on blood. Male isopods invisible to naked eye, female excretes a chemical substance to maintain masculinity of small ma...

Alex Mustard / Blue chromis (Chromis cyanea) damselfish with a large parasitic isopod attached below its eye. There is debate about whether these isopods should be considered parasites or merely hitch-hikers. Jardin...

Alex Mustard / Diver swimming over a coral reef with Staghorn coral (Acropora cervicornis) with Blue chromis (Chromis cyanea) and Spotted scorpionfish (Scorpaena plumieri). East End, Grand Cayman, Cayman Islands, Br...

Claudio Contreras / Blue Chromis (Chromis cyanea) with Cymothoid Isopod attached, Cienaga de Zapata National Park, Matanzas Province, Cuba.