There was also development in fishing activity, producing the valued "garum" or "liquamen", a condiment obtained from the maceration of fish, preferably tuna and mackerel, exported throughout the entire empire. The largest producer of the entire Roman Empire was in Tróia Peninsula, near modern Setúbal, south of Lisbon. Remains of "garum" manufacturing plants show a sharp growth of the canning industry in Portugal, mainly on the coast of Algarve, but also in Póvoa de Varzim, Angeiras (Matosinhos), and the estuary of the Sado River, which made it one of the most important centers for canners in Hispania. At the same time, specialized industries also developed. The fish salting and canning in turn required the development of salt, shipbuilding, and ceramic industries, to facilitate the manufacture of amphorae and other containers that allowed the storage and transport of commodities such as oil, wine, cereals, and preserves.