The Treibnetzfischerei is one of the most important methods of the passive fishery.

As catch devices find driving nets application, which are combined to fleet. Main catch objects of the Treibnetzfischerei are herring, salmon and Thunfisch. If a swarm meets a driving net swimming in the water, then the fish with the heads continue to push not by the Netzmaschen and cannot. With the pressure on the throat the Kiemen spreads itself, so that the fish hangs itself up with the

The driving net is a perpendicularly swimming, rectangular Netztuch. The extents of the nets are very different, them are enough from 6 to 7 m and about 11 meter height with herring driving nets up to several kilometers length with the Thunfischfang.

To upper CIM of the nets floats from cork or similar material are attached. The number of floats depends linen, the lift strength of the floats and other factors on the dimensions of the nets, the prospective catch quantity, the weight that.

The simple fleet consists of 10 to 20 nets and finds only with catch with small ships near the coast or on lake application. For suspending the ship with the nose is turned into the wind and floats then with slowly turning screw backwards. After admission first the end mark buoy is exposed to the reverse movement, which then the nets as well as the other parts that follow fleet. The drift effected usually at night and catching up in the morning, it covers 6 to 8 hours.

Criticism

Many dolphins, particularly the large die in driving nets, since also they impose themselves and suffocate, likewise sharks, seals, sea turtles and sea-birds. This happens in particular with the hunt for Thunfi.

As way out of this dilemma with the Thunfisch catch since longer the fishing rod was already established seal fishery: By the catch ship a Langleine is pulled, which is provided with seals in regular intervals. The Langleine can be yielded over a hoist before the Thunfisch swarm, an accordingly high travel of the ship, which only by Thunfi can be gone along, is the Beifang to minimize. The disadvantage of this method is the Beifang of sea-birds, as for instance the Albatross, which responds to the seals at the Langleine and ends at it. The obvious advantage is the small damage of the Thunfischs, probably also the principal reason for this catch method.

Related links

• www.greenpeace.de

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