Surrounding nets are cast around shoals of fish located or artificially drawn together and are hauled in immediately. Surrounding nets are highly selective because they are cast to capture shoals previously detected and identified. By-catch is minimal and the nets have no impact on the seabed. Fish are sometimes attracted to the nets by beams of light produced by dozens of powerful lamps, so-called “lampare”, which are mounted on the fishing boats (even below the waterline) and can be as bright as 1000 watts each. Each fishing boat is paired with a smaller vessel known as a “caiccio”, which is essential to keep the shoal compact while the net is being cast. Once the main fishing boat has surrounded the shoal, the net is closed and hauled aboard. The fish trapped in the central bunt of the net are drawn up to the side of the boat, where they are removed with small hand-held scoops, put into crates and covered with ice. In summer, the lamps attract blue fish especially, including sardines, anchovies, sprats, mackerel and chub; close to the coast and in the vicinity of mussel cultivations, the catch consists of grey mullet, striped seabream, sea bass and gilt-head bream.