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Otter boards used in bottom trawling are based on a similar design principle. The design takes advantage of the shearing effect achieved when the board is positioned at an oblique angle to the current. The effect is reminiscent of that of a kite in the wind. [2] [1] Different designs are found in Switzerland, the Nordic countries, California ...
Otter trawling derives its name from the large rectangular otter boards which are used to keep the mouth of the trawl net open. Otter boards are made of timber or steel and are positioned in such a way that the hydrodynamic forces, acting on them when the net is towed along the seabed, push them outwards and prevent the mouth of the net from ...
However, single-boat trawling is more common. Here, the horizontal spread of the net is provided by trawl doors (also known as "otter boards"). Trawl doors are available in various sizes and shapes and may be specialized to keep in contact with the sea bottom (bottom trawling) or to remain elevated in the water. In all cases, doors essentially ...
As authorities extend their dragnet over land, sea and air, the renegade sea otter known as '841' continues to evade capture while snacking on shellfish. California's wily, surfboard-stealing sea ...
1: trawl warp, 2: otter boards, 3: longline chains, 4 hunter, 5: weights 6: headline with floats, 7: pre-net, 8: tunnel and belly, 9: codend. Midwater trawling is trawling, or net fishing, at a depth that is higher in the water column than the bottom of the ocean. It is contrasted with bottom trawling.
The 5-year-old female otter has shown aggression toward people for several weeks and poses a public safety risk, the U.S. Fish and Wildlife Service said in a statement.
The five-year-old animal had gained a reputation as ‘California’s angriest otter’ after she was captured on social media attacking surfers in Santa Cruz and biting their boards
Trawling is a method of fishing that involves actively dragging or pulling a trawl through the water behind one or more trawlers. Trawls are fishing nets that are pulled along the bottom of the sea or in midwater at a specified depth. A trawler may also operate two or more trawl nets simultaneously (double-rig and multi-rig).