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Discards

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 fishers 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. Discards may also be caused by high grading, where marketable fish are discarded to make room for more valuable catches. Discarding can be highly variable in time and space as a consequence of changing economic, sociological, environmental and biological factors.

Impacts
Discarding affects the environment in two ways; firstly, through increased mortality to target and non-target species, The survival of discarded fish and invertebrates is variable and depends on species and fishing gear used. For example, species such as the Pacific halibut caught in longline fisheries in the Bering Sea, or lesser-spotted dogfish in beam trawls in the English Channel have survival rates of between 88 and 98 per cent. Survival rates of roundfish discards are significantly lower, and this mortality is included in most International Council for the Exploration of the Sea stock assessments. Crustaceans are thought to be more hardy, though survival of crustaceans is variable; == Discard policies ==
Discard policies
The idea of banning discards is that since the fish that are discarded have a negligible chance of survival, it is better from a management perspective that they are included in the fishing induced mortality figures on which allowable catch estimates are based. Norway The Norwegian Government introduced a ban on the discarding of some commercial species of fish in 1987. The initiative in Norway has been coupled with a comprehensive programme of monitoring and surveillance and a system whereby areas can be opened and closed when bycatch rates become excessive. The Norwegian system of attempting to reduce mortality of illegal fish is based on reducing their capture rather than reducing landing of "illegal" specimens. There has been no monitoring of the discard ban to evaluate its effectiveness, but retrospective studies have indirectly quantified the success of the ban through improvements in stock status and economic performance of fish stocks managed in Norwegian waters. Canada Canada has also instituted a ban on discarding at sea in its Atlantic groundfish fishery that makes it illegal to return to the water any groundfish except those specifically authorised and those caught in cod traps. Authorised release is only considered for species that are known to have high survival rates on release, or where there is no practical or nutritional use for a particular species. In addition to the banning of discards, larger vessels are required to carry observers, which would imply that there are now no illegal discards on these vessels. Iceland The introduction by the Icelandic Government of an individual transferable quota (ITQ) system of fisheries management across virtually all its major fisheries was followed by the introduction of a ban of at-sea discarding of catch. despite the fact that fishers were offered 10 per cent of the market price for fish landed outside quota. In an attempt to address this change, the New Zealand Government increased the percentage of market price paid to 50 per cent. The balance between offering an incentive to land discarded fish and the disincentive to catch fish over or outside quota limits is clearly a fine one, and dependent on the financial reward or penalty attached. European Union EU legislation currently states that there are total allowable catches for each species, which are sub-divided between European Union member states, the intention of which is to conserve fish stocks. The individual countries then use this figure as a basis for quota allocation to individual fishers or fishers organisations. The quota rules however require that any fish which is caught outside quota allowances or below minimum landing size be discarded and that it is an offence for a fishing vessel to be carrying on board any fish for which it does not have a valid quota or which is outside regulated size limits. ==See also==
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