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Greek fishing techniques
When fishing for swordfish or tuna the fishermen in Greece employ a fishing line - and not a net! - with a total length of up to 40 nm. Their rig uses flags/jerry cans/plastic bottles to suspend the fishing line close to the surface at an average depth of 10 metres and always between 3 or 40 metres deep. And as indicated in the image below: between the flags/metallic reflectors and the bottles the yellow fishing line sinks deeper along a catenary curve.
With a sailing yacht it is safe to “cross”,
certainly if some distance is kept from the floating
bottles or flags/radar reflectors.
Usually not flags but metallic reflectors are used, allowing the fishermen to locate the fishing line more easily as it will drift along with the currents. There is an interesting variation in the flag/pole colours, shapes and markings by which the owner can distinguish his rig from others. Also, they mark the reflectors for instance with stripes, because during collecting when they face a reflector, they can establish whether it is the first, the last or a middle one.
The length between two reflectors can be 0,5-6nm, but the total length of the rig (from the first reflector to the last) can be up to 40nm. Sometimes the line can be cut, so they have to collect two or more separate pieces of the line.
One will encounter nets in shallow waters less than 30 metres deep. Moreover, in the open sea there are fishing boats which circle areas with nets in order to catch sprat, but the fishermen remain there with the net and never leave their net alone…