On shore tunny nets are marked by masonry beacons, 2.1m high, surmounted by two spherical top marks, the upper one white and the lower one red. At sea, tunny nets are marked by buoys, surmounted by a white ball over a red ball, that mark the limits of the areas occupied by the nets, corresponding to the beacons on shore.
The seaward extremities of the nets are marked by a lightboat, showing by day a white ball over a red ball, and at night two fixed lights, the upper white and the lower red.
The lightboat may be replaced by a lighted buoy showing the same signals.
Tunny nets may be set from April to August in the NE part of Golfe de Tunis at the following locations:
The positions and lengths of the tunny nets can vary from one year to the next. Vessels should give the nets a wide berth and keep watch, in particular, for the tunny net of Ras el Ahmar, the end of which lies 1.4 miles S ofthe islet of Zem-bretta. This net is marked by a N cardinal lighted buoy.
A tunny net may be set from April to August in the area NW of Cap Zebib (37°16'N., 10°04'E.). Its extremity is marked by a N cardinal lighted buoy. Vessels should give it a wide berth.
Tunny nets may be set from April to August in the following areas:
1. North of Munastir.
2. Northnorthwest of Ile Kuriat.
3. Northnortheast of Ras Kabudiyah.
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