Otter trawl | fishing equipment | Britannica
The otter trawl is the most widely used bottom-fishing gear. As it is dragged forward, a pair of flat plates called otter boards—one on each side of the trawl net and weighing several tons—spreads horizontally to keep the mouth of the trawl open; at the same…
Fishing Gear: Midwater Trawls - NOAA Fisheries
Similar to bottom trawling, midwater trawling involves towing a large net through the water column. Trawls are designed to capture and trap the target species inside the codend as the net is hauled through the water.
Bottom trawling - Wikipedia
Otter trawl. 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 otter-trawl net is a device for catching bottom fish. It is constructed of twine webbing so that when fully assembled and rigE;ed i t will take the shape of a huge funnel while traveling along the bottom of the ocerol (fig. 1). The proper assembly of the otter trawl is one of the most
The typical large modern otter trawler using this side-trawl type of gear is designed for operation by six keymen per shiftj each keyman is stationed at one of the six predetermined key poSitions when setting or hauling in the net (fig. 1).
Demersal Trawl - General - Seafish
A demersal trawl is a cone shaped net that is towed on the seabed to target demersal fish species. The mouth of the trawl is held open by a pair of trawl doors (Otter Boards).
Otter (fishing device) - Wikipedia
The otter is a fishing device constructed with two parts, an otter board and a fishing line. It is steered by pulling on the line then letting stack so the slide mechanism on the board operates to switch direction. It may be used from a boat or pulled from the shore.
The Otter Trawl - The Short Blue Fleet
The Otter Trawl. During the late 1890’s trawlermen, including Robert Muirhead Hewett, started experimenting with otter trawls. Steam trawlers could maintain a constant speed and thus there was no danger of the trawl collapsing due to loss of speed.
Use an otter trawl instead of a beam trawl - Conservation …
Otter trawls caused similar mortality of invertebrates in the trawl tracks compared to beam trawls in sandy areas (otter: 0–41%: beam: 1–53%) but lower mortality in silty areas (otter: 1–65%: beam: 2–82%).
Otter trawling page - Fishing NJ
Otter trawling - also known as dragging - is one of the most commonly used techniques for fish harvesting. In otter trawling a large net, is dragged along the bottom or up in the water column behind a towing vessel.