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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. It is very difficult to retrieve from a boat once fish are on.
Bottom trawling is trawling (towing a trawl, which is a fishing net) along the seafloor. It is also referred to as "dragging". The scientific community divides bottom trawling into benthic trawling and demersal trawling. Benthic trawling is towing a net at the very bottom of the ocean and demersal trawling is towing a net just above the benthic ...
A fishing trawler is a commercial fishing vessel designed to operate fishing trawls. 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.
Setting a trawl. Trawling is an industrial method of fishing that involves pulling a fishing net, that is heavily weighted to keep it on the seafloor, through the water behind one or more boats. The net used for trawling is called a trawl. This principle requires netting bags which are towed through water to catch different species of fishes or ...
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.
This the commonest of the towed fishing gear; it is also known as "otter trawling". Trawl nets are shaped like a funnel with the sides extended ahead to guide the fish into the net. Otter boards (sometimes called "doors") spread the towing wires and keep the net open horizontally. The mouth of the net is held open vertically by the use of ...
Otter fishing. Cropped extract of Carta Marina by Olaus Magnus dated 1539 showing an otter retrieving a fish for its master. Otter fishing is a fishing technique which uses trained otters to fish in rivers. This method has been practised since the 6th century in various parts of the world, and is still practiced in southern Bangladesh .
Fishing vessel. A fishing vessel is a boat or ship used to catch fish and other valuable nektonic aquatic animals (e.g. shrimps / prawns, krills, coleoids, etc.) in the sea, lake or river. Humans have used different kinds of surface vessels in commercial, artisanal and recreational fishing .
Fish wheel. A wooden fish wheel out of the water. A fish wheel, also known as a salmon wheel, [1] is a device situated in rivers to catch fish which looks and operates like a watermill. However, in addition to paddles, a fish wheel is outfitted with wire baskets designed to catch and carry fish from the water and into a nearby holding tank.
Tool use by sea otters. A sea otter using a rock to break open a shell. The sea otter, Enhydra lutris, is a member of the Mustelidae that is fully aquatic. Sea otters are the smallest of the marine mammals, but they are also the most dexterous. Sea otters are known for their ability to use stones as anvils or hammers to facilitate access to ...