Nah, I don't think anyone specifically causes the fissures. The way I understand it is that they're kinda like rips in reality, little pockets where the world doesn't function the way it's supposed to. Things get warped in these areas until we can stabilize them.
[Talon gestures at his distinctly not human body.]
no subject
[Talon gestures at his distinctly not human body.]
Therefor, fish.