Ever since 1738, when the Tabarchini arrived on the island of San Pietro and founded Carloforte, they were the only ones fishing the bluefin tuna.
Tuna fishing is an ancient practice. The first tuna fishing techniques were created by the Phoenicians, first along the Spanish coast and then in Sardinia, along the route that the tuna usually follow in the spring season, when moving from the Atlantic Ocean in the warm waters of the Mediterranean Sea to reproduce.
In this section between San Pietro Island and the mainland, four tuna net systems were built, but only the one in Carloforte is currently in operation. The oldest tonnara (tuna fishery/net) in the area is the Tonnara of Portoscuso, also called Su Pranu, founded in 1587.  In the years that followed, a large number of buildings for the processing of the tuna were built near the tonnara, along with warehouses, homes, a church and a large town square.  After years of abandonment, the entire complex was acquired in 2006 by the City of Portoscuso and subjected to numerous restoration works, to allow the reopening of the structure to the public as an extraordinary example of industrial archeology.
You have to arrive at the beautiful beach of Portopaglia to admire the former Tonnara of Portopaglia. Founded in 1602, this tuna fishery dropped its nets in the sea for the last time in 1974.  Recently, the old fishermen’s houses in the hamlet have been renovated, becoming a private residential neighborhood.
The Tonnara of Isola Piana dates back to 1698, opened by a merchant from Cagliari, Giuseppe Cava. Even today, near La Punta, this structure is used for fishing tuna in the spring. The whole island, including the Tonnara, is owned privately and is not open for visits.

Link to Article - ON THE ROUTE OF TUNA

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