Actually, if you were to cook them and eat them, I don't think you'd find them to be very poisonous.
What Louey meant to say, was that they are venomous. :wink: It is a slight distinction, but one worth pointing out. Their dorsal spines can inject venom, making them a little difficult to work with. Apparently, the venom is quite painful, but rarely life threatening.
Poisonous is used to describe animals that have ingestible toxins, instead of injectable ones.