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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 ...
Pelagic (midwater) otter trawl. 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. The body of the trawl is funnel-like, wide at its "mouth" and narrowing towards the cod end, and usually is fitted with wings of netting on both sides of the mouth.
Otter trawling has been shown to have a significantly negative impact on the benthic invertebrate biodiversity in areas where trawling is less restricted. [5] Despite its protection as a National Marine Sanctuary, a study found microplastic concentrations were higher than the global average, with a higher amount closer to shore. [4]
Otter 841, California's most ornery sea mammal, has returned to waters off Santa Cruz. Authorities warn surfers and swimmers to steer clear of the creature.
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 ...
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 ...
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.
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.