Stonefish: World's Most Venemous Fish

Reef Stonefish

Wikipedia

https://en.wikipedia.org/wiki/Synanceia_verrucosa

See the stonefish video near bottom of the following National Geographic article: http://news.nationalgeographic.com/2015/09/150901-sea-snake-stonefish-battle-australia-animals/

Another stonefish video: https://www.youtube.com/watch?v=JxSPWOxYu7Y