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Combined gillnets-trammel nets
Combined gillnets-trammel nets

ISSCFG code: 07.6 – standard abbreviation: GTN
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OverviewThis bottom-set gear consists in two parts: - an upper one being a standard gillnet where semi-demersal or pelagic fish may be gilled and - lower part being a trammel net where bottom fish may entangle. As standard gillnets or trammel nets the combined nets are maintained more or less vertical by floats on the upper line (headrope) and weights on the ground-line (footrope).Accessory EquipmentSmall solid floats, usually made of plastic or any other floating material, cylindrical, oval or egg-shaped, are attached to the headrope. Lead weights or any sinkers are evenly distributed along the ground-line. This line can also be made of lead cored rope which does not need any additional weight.Handling EquipmentTraditionally combined nets were hauled by hand, especially on smaller boats. Recently hydraulic driven net haulers are commonly used.Vessel Overview Gillnetters.Fish OperationSuch nets are set on the bottom. After a certain time depending on target species, they are hauled on board by hand or with a net hauler. The gilled, entangled or enmeshed fish are removed from the net by hand.Target SpeciesThese nets may catch bottom fish in the lower trammel net part, together with semi demersal or pelagic fish in the upper gillnet part.Water Area OverviewNets combined in this way have their origin in Mediterranean (Spain, Morocco, France, Malta, and Greece) and from there it has spread over many parts of the world.Gear EnvironmentThese nets may be used to fish above and close to the bottom mainly in marine waters.ImpactsSpecies Ghost fishing of lost gears and catch of diving seabirds are the most concerned impacts.
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