Surface gillnets (length: 28 m; height: 4 m; mesh size: 14, 16 & 19 mm, monofilament) were attached to the shoreline and deployed from 21 May to 10 June 2010 at dusk, placed at a 90◦ angle to the shore. The gillnets were retrieved at dawn, approximately 10 h after deployment. The custom-made trap (Fig. 2) was deployed from 25 May until 25 June 2010 and was positioned so that the lead net was at a 90◦ angle to the shore. The trap consists of a lead net with a mesh size of 20 mm (50 m long and 5 m high), and two wings (10 m long and 5 m high). The lead panel ends before the slit formed by the two wings. This vertical slit is the entrance to the heart (5 m×5 m×5 m), a partially open cube where the bottom and the two sides are covered with mesh (Fig. 2). From the heart, a section of netting of decreasing size, in the shape of a funnel, leads to the tunnel, which has three consecutive funnels. The tunnel has a 15-mm mesh for the first 4 m, and 10-mm mesh size for the residence chamber, which is 2.5-m long. The last funnel leads to the residence chamber (Fig. 2), where the fish stay until collected with a knotless hand-held net. One trained individual can deploy the trap
within 1–2 h with a boat. Once in position, the trap can be maintained in the same place, opened and closed according to fishing periods, and only taken out of the water to clean the net.