Each morning as fishermen set out for the day's catch of mullet and sea bream, they brace themselves for the possibility of a gruesome discovery. For months, the bodies of migrants from sub-Saharan African countries have been washing up on the beaches of El Louza on Tunisia's Mediterranean coast. Most belong to young men, some of them barely old enough to shave, left to rot in the water for days by the time the tide brings them to shore. "Sometimes you find a leg, sometimes you find a head, sometimes you find dogs eating them," said one fisherman, Khaled, who...