Torbidio - Is spearfishing in dirty, stained, or murky waters with low visability - Looking for the silhoette of the fish against the suface light - alot of the time you are shooting upwards and in shallow water using this technique. Be careful!
Aspetto - Is lying motionless on the bottom trying to "blend-in" with a rock or weeds, or just the bottom itself and waiting for unsuspecting or curious fish to come into range. 
All'aguatto - Is spotting and stalking a fish or group of fish. Usually it involves trying to get close to fish that are relating to bottom structure without spooking the fish off of the structure before you are within shootin' range.
Be safe...
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And good huntin' to ya!
-Dan-
