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Trammel nets
Trammel nets
Source: FAO-Fish.Tech.Pap.222, p. 42

ISSCFG code: 07.5 – standard abbreviation: GTR
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OverviewA trammel net consists of two/three layers of netting with a slack small mesh inner netting between two layers of large mesh netting within which fish will entangle. These nets are strings of single, double or triple netting walls kept more or less vertical by floats on the headrope and mostly by weights on the groundrope. These are occasionally set in strings.Accessory EquipmentSmall solid floats, usually made of plastic and either cylindrical or egg-shaped, are attached to the head rope and lead weights are evenly distributed along the ground rope.Handling EquipmentMost trammel nets use to be hauled by hand. Modern gillnet haulers may also be used for hauling the nets. Net drums are also, occasionally, employed.Vessel Overview Gillnetters.Fish OperationTrammel nets are most common as stationary gear, but they can also be used drifting. The fish entangle themselves in a pocket of small mesh webbing between the two layers and large meshed walls. Afterwards, the trammel nets are hauled back to the surface for extracting the entangling fish from the netting.Target SpeciesDemersal species, fish and crustaceans.Water Area OverviewAll over the world.Gear EnvironmentThese nets are especially used to fish at, or near to, the bottom in inland and marine waters.ImpactsSpecies "Ghost" fishing of lost gears and capture of small sized organisms and non-target species, which are frequently discarded at sea. Such impact can be mitigated by using larger meshes. However, compared to gillnets the selectivity of trammel nets are lower and catches of small organisms and non-target species are common.
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