Agassiz's glassfish (<i>Ambassis agassizii</i>) showing translucent flesh and internal organs. Detail from a photograph taken at Sydney Zoo aquarium 2023-03-08. 
Depicts a single silvery fish cropped from the original photo and pasted against a transparent background.
<a href="//commons.wikimedia.org/wiki/User:Pelagic" title="User:Pelagic">Pelagic</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>