pirate

"It is sad that the American forces off the coast of Somalia are here for fun and are not combatting the pirates," Abdullahi Said Samatar, security affairs minister in Somalia's semiautonomous Puntland region told The Associated Press in a telephone interview from Puntland. Earlier this week, Somali forces successfully stormed a ship that had been taken by pirates, who Samatar is quoted as saying "crossed the line" when they attacked a vessel under hire by Somali businessmen.

An electric fence. This is what the IMO (UN) is recommending against pirate attack. Granted, it's better than just using fire hoses, but not much. Like a fire hose, somebody can simply point his/her automatic rifle at you and tell you to turn it off, but at least it doesn't require the crew to stand, facing the muzzles, squirting water.