Discards (original) (raw)
Discards are the portion of a catch of fish which is not retained on board during commercial fishing operations and is returned, often dead or dying, to the sea. The practice of discarding is driven by economic and political factors; fish which are discarded are often unmarketable species, individuals which are below minimum landing sizes and catches of species which fishermen are not allowed to land, for instance due to quota restrictions. Discards form part of the bycatch of a fishing operation, although bycatch includes marketable species caught unintentionally. Discarding can be highly variable in time and space as a consequence of changing economic, sociological, environmental and biological factors.
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dbo:abstract | Discards are the portion of a catch of fish which is not retained on board during commercial fishing operations and is returned, often dead or dying, to the sea. The practice of discarding is driven by economic and political factors; fish which are discarded are often unmarketable species, individuals which are below minimum landing sizes and catches of species which fishermen are not allowed to land, for instance due to quota restrictions. Discards form part of the bycatch of a fishing operation, although bycatch includes marketable species caught unintentionally. Discarding can be highly variable in time and space as a consequence of changing economic, sociological, environmental and biological factors. Discarding patterns are influenced by catch compositions, which in turn are determined by environmental factors, such as recruitment of small fish into the fishery, and social factors, such as quota regulation, choice of fishing gear and fishermen's behaviour. There have been numerous studies on the scale of discarding. In the North Sea the total annual quantity of discards has been estimated at 800,000–950,000 tonnes, or the equivalent of one-third of the total weight landed annually and one-tenth of the estimated total biomass of fish in the North Sea. (en) Discards in de visserij zijn vangsten die wel aan dek komen maar vervolgens weer overboord gezet worden. Redenen hiervoor kunnen zijn: * de (vis)soort is niet te verkopen * de vissen zijn kleiner dan de wettelijk toegestane lengte * de toegestane hoeveelheid te vangen vis is reeds bereikt (vangstquota) * een op een later tijdstip verkregen vangst brengt meer op dan een vangst die eerder is verwerkt en er is geen ruimte om de eerdere vangst aan boord houden: door de eerdere vangst overboord te zetten, creëert men ruimte voor de meer waardevolle vangst (high grading). Discards (letterlijk: "afgekeurden") onttrekken zich aan de vangststatistieken waardoor fouten kunnen ontstaan in de schattingen van de hoeveelheid beschikbare vis (zie Visserijbiologie). Discards kunnen een belangrijke voedselbron voor zeevogels zijn. Sinds 2016 is er de zogenaamde discard-ban. Met deze wet verplicht de Europese Unie vissers om ondermaatse vis aan boord te houden. Deze vis gaat wel af van het jaarlijks vangstquotum maar mag geen commerciële waarde hebben. Er wordt daardoor geprotesteerd vanuit de visserijsector omdat deze wet de rendabiliteit van de schepen zwaar zou verminderen. (nl) |
dbo:wikiPageExternalLink | http://www.fao.org/docrep/008/y5936e/y5936e00.HTM http://www.europarl.europa.eu/RegData/bibliotheque/briefing/2013/130436/LDM_BRI(2013)130436_REV1_EN.pdf |
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rdfs:comment | Discards are the portion of a catch of fish which is not retained on board during commercial fishing operations and is returned, often dead or dying, to the sea. The practice of discarding is driven by economic and political factors; fish which are discarded are often unmarketable species, individuals which are below minimum landing sizes and catches of species which fishermen are not allowed to land, for instance due to quota restrictions. Discards form part of the bycatch of a fishing operation, although bycatch includes marketable species caught unintentionally. Discarding can be highly variable in time and space as a consequence of changing economic, sociological, environmental and biological factors. (en) Discards in de visserij zijn vangsten die wel aan dek komen maar vervolgens weer overboord gezet worden. Redenen hiervoor kunnen zijn: * de (vis)soort is niet te verkopen * de vissen zijn kleiner dan de wettelijk toegestane lengte * de toegestane hoeveelheid te vangen vis is reeds bereikt (vangstquota) * een op een later tijdstip verkregen vangst brengt meer op dan een vangst die eerder is verwerkt en er is geen ruimte om de eerdere vangst aan boord houden: door de eerdere vangst overboord te zetten, creëert men ruimte voor de meer waardevolle vangst (high grading). (nl) |
rdfs:label | Discards (en) Discards (nl) |
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