the boat , named airone , was intercepted some 90 kilometers -lrb- 56 miles -rrb- from the libyan port of misrata .
the airone , carrying three sicilians and four tunisians , had embarked from mazara del vallo in sicily five days earlier to fish for shrimp .
the airone 's captain said there were about 10 other ships in the area when it was seized .