[spaghetti]

No license required for spearfishing in the italian seas: just do it.
But you must take note of the following regulations:
-no scuba hunting
-no night hunting
-it is mandatory to dive with a float of buoy with red-white flag and keep within 50 meters from your buoy.
-it is forbidden to keep the speargun loaded out of the water, even on boats of just above your float board
-in summer it is forbidden to spearfish within 500 meters from beaches if swimmers are present (but you can hunt if you go very early in the morning, assuming there's nobody swimming so early)
-stay 200 meters away from ports. harbors, marinas and aquaculture fish breedings
HARVEST LIMITS:
-no lobstering, no scallopping: it's illegal for divers
-groupers are protected: you can cacth maximum one grouper per day
-total daily harvest: maximum 5 kilograms per day, unless one single fish exceeds that weight (example: you can exceed the limit if you catch for example a 23 kilograms amberjack plus 4,99 kilograms of other "mixed" fishes, but you can not exceed the 5 kilogram limit if none of the single fishes caught is singularily over 5kg. Silly, isn't it?)
MARINE PARKS
-check where you are. There are some 60 marine parks all over the country where spearfishing is strictly forbidden. So wherever you go, make sure that you're not inside one of those marine parks.
You're welcome