The lagoon fisheries are also of great importance, more especially those of Comacchio, the lagoon of Orbetello and the Mare Piccolo at Taranto &c The deep-sea fishing boats in 1902 numbered 1368, with a total tonnage of 16,149; 100 of these were coral-fishing boats and 111 sponge-fishing boats.
This island separates the Gulf of Taranto from the deep inlet of the Mare Piccolo, and is sheltered by two other flat islands, San Pietro and San Paolo; the latter is occupied by a lighthouse.
The chief industry is the cultivation of oysters in four large beds in the Mare Piccolo; besides oysters, Taranto carries on a large trade in cozze, a species of large black mussel, which is packed in barrels with a special sauce.
The arsenal extends for a mile and a half along the southern coast of the Mare Piccolo, which constitutes its chief basin.
The Mare Grande is connected with the Mare Piccolo by a channel 875 yds.