A new study has found the primitive hagfish, also known as a “snot eel” can defend itself by releasing a noxious slime that chokes would-be predators. The long, thin hagfish are almost blind and have no jaws but use tooth-like rasps to prey on dead and dying fish.
http://www.news.uwa.edu.au/201111014096/international/study-finds-hagfish-use-slime-choke-predators
Prof Euan Harvey, Oceans Institute, UWA