Zippsy:I love the part about the "cone-shaped area" that it protects and I've heard a lot of divers spouting that theory as gospel and others swearing it's an inverted cone. The problem is that no one has told the trigger fish that they are supposed to live by that rule. All the ones I have seen protect an area around their nest where they damn well please.... up, sideways, 45 degree angle, wherever.
*laughing*
I wasn't aware of the cone thingy until I read that and you're right, I hdan't really noticed any method to their mayhem!
I had a little purple trigger (not sure of species, they're only about 6 inches long) and it just kept swimming round in a circle, bopping me on the mask, right between my eyes...
Managed to take this photo of it on one of its attack runs...!