FAO Home>Fisheries & Aquaculture
Food and Agriculture Organization of the United Nationsfor a world without hunger
EspañolFrançaisРусский
Set longlines
Set longlines
See Tree Map   display tree map

Characteristics
OverviewA set longline consists of a mainline and snoods with baited (occasionally unbaited) hooks at regular intervals and which is set, in general, on or near the bottom. The number of hooks, distance of snoods on the main line and length of the snoods depends on the target species, the handling capacity and technology used. Longlines can be set as bottom lines (including on very rough bottom and/or coral reefs) or, less commonly, in midwater or even not far from the surface. Its length can range from few hundred meters in coastal fisheries to more than 50 km in large scale mechanized fisheries.Handling EquipmentVessels are usually provided with powered line hauler or gurdy that may be mechanically or hydraulically driven. The baiting of hooks may be manual or by a "baiting machine". On board modern automatic longliners, almost all the manoeuvres are mechanized with a series of specialized pieces of equipment.Vessel OverviewLongliners. The vessels range from open boats, using manual operated longlines, to highly mechanized, specialized, vessels, equipped with a series of specialized pieces of equipment for the mechanization of almost all the manoeuvres. The most modern longliners have fully sheltered deck with only a window by the stern for shooting the line and another by the side forward to haul back the line. Such, highly rationalized, arrangement increase the safety of the vessel and improved the working conditions of the crew.Fish OperationThe fish are attracted by the natural or artificial bait (lures), hooked and held by the mouth until they are brought aboard the operating vessel which periodically hauls the gear.Target SpeciesBottom or demersal species, occasionally, pelagic one.Water Area OverviewAll over the world, in the sea and inland.Gear EnvironmentLonglines are operated from shallow waters to thousand or more meters in depth, on all types of bottoms, including very rough ones.ImpactsSpecies Incidental catch of turtle, of certain species of sharks or other endangered species are possible negative impacts. Incidental catch of seabirds when setting and/or hauling the line are also possible. Technologies exist for avoiding the catch of seabirds while reducing the bycatch, in general, (turtle, sharks or other) is more difficult.
 
Powered by FIGIS